Ceres, Inc. plans to market its bioenergy seeds and traits under the name Blade Energy Crops in the U.S. Company president and CEO Richard Hamilton unveiled the new brand at the BIO World Congress on Industrial Biotechnology in Chicago.

Clean Power Finance has been selected by Conergy as its Preferred Financing Partner for residential, off-grid and small commercial systems. In addition, Conergy plans to deliver a co-branded version of Clean Power Finance’s web-based software suite, CPF Tools, to their network of solar integrators.

Coskata Inc. said that it will produce 40,000 gallons of cellulosic ethanol a year at a commercial demonstration plant near Pittsburgh, Pennsylvania. The US $25 million project will be located at the Westinghouse Plasma Center, the current site of a pilot-plant gasifier owned and operated by Westinghouse Plasma Corporation

New England Wood Pellet’s Jaffrey, New Hampshire plant produces approximately 75,000 tons of wood pellet fuel per year. Most is bagged and shipped to a network of more than 100 retailers throughout the Northeast. From there it helps heat homes, businesses and schools. Steve Walker, the company’s president and CEO, took the time to show RenewableEnergyWorld.com around the facility to give us a look at how wood pellets are made.

SolCool One, LLC and its manufacturing partner, Senergy Cooling Systems, delivered the first Millennia direct current air conditioning/heating system to Advanced Cooling Distributors, LLC, the wholesale distribution HUB for the Millennia in Central Florida.

Radically new technology that eliminates the need for fossil fuels is one of the few alternatives that might help to prevent a cataclysm. MPI has been developing a revolutionary breakthrough that will make it possible to generate electricity 24/7 without requiring fossil or uranium fuels. This is abundant, renewable, energy from a source never before commercialized. Hans Coler, a German inventor, demonstrated it was possible in 1926. The following year Werner Heisenberg, a physicist awarded a Nobel Prize, stated: “We could utilize magnetism as an energy source”.

There were a couple of small Australian solar power projects that I left out of my look at solar thermal power a little while ago, as I thought they were worthy of separate consideration.

The first of these is being put together by a South Australian company called Wizard Power, which is trying to commercialise research from the Australian National University (ANU) - a solar concentrator dish and a closed loop thermochemical energy storage system using ammonia.

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Most solar thermal projects use molten salt or water to store energy in the form of heat, as will another Australian solar thermal plant that uses graphite as the storage medium.

Like other solar thermal companies (Ausra being the highest profile example), Wizard is touting the coupling of energy storage with solar power as a “baseload power” solution, with the goal for the new plant being to provide power 24 hours a day to the South Australian town of Whyalla.

Wizard plans to start construction of a demonstration plant in October and to begin generating power from July 2009. Six concentrator dishes will be built on land opposite the OneSteel steelworks, which receives an average of 301 days of sunshine each year.

The demonstration plant was funded with an Australian Greenhouse Office grant of $7.4 million as part of the Advanced Electricity Storage Technologies programme, and the plant may be expanded if the technology is proven.

There have been reports that an associated company, Wizard IT, has gone into receivership, but apparently this does not impact the Wizard Power organisation.

The ANU describes the “closed loop thermochemical energy storage using ammonia” process as :

n this system, ammonia (NH3) is dissociated in an energy storing (endothermic) chemical reactor as it absorbs solar thermal energy. At a later time and place, the reaction products hydrogen (H2) and nitrogen (N2) react in an energy releasing (exothermic) reactor to resynthesise ammonia.

2 NH3 + Heat <—> N2 + 3 H2

A fixed amount of reactants (ammonia, nitrogen and hydrogen) are contained in a closed loop, and pass alternately between energy storing and energy releasing reactors with provision for storage of reactants in between. Because the solar energy is stored in a chemical form at ambient temperature, there are zero energy losses in the store regardless of the length of time that the reactants remain in storage. The reactors are packed with standard commercial catalyst materials to promote both reactions. Counter-flow heat exchangers transfer heat between in-going and out-going reactants at each reactor to use the energy most effectively.

Feeding the reactors with pure reactants is possible through the natural separation of reactants and products in the storage system: at the pressures applied, ammonia condenses.

By ensuring that the stuff leaving each reactor transfers its own thermal energy (sensible heat) to the stuff going in - using heat exchangers - most of the solar energy is stored in the change in composition of the chemicals which are kept at ambient temperature.

The advantages of this energy storage mechanism are identified as:

* A high energy storage density, by volume and mass.
* The reactions are easy to control and to reverse and there are no unwanted side reactions.
* All constituents involved are environmentally benign.
* There exists a history of industrial application with the associated available expertise and hardware.
* A readily achievable turning temperature of 400oC to 500oC (depending on the pressure). This helps to reduce thermal losses from dish receivers, avoids some high temperature materials limitations, and allows lower quality (and hence cheaper) dish optics to be used.
* All reactants for transport and handling are in the fluid phase, which provides a convenient means of energy transport without thermal loss.
* At ambient temperature the ammonia component of reactant mixtures condenses to form a liquid, whilst the nitrogen and hydrogen remains as a gas. This means that only one storage vessel is required for reactants and products.

There is also a possibility of using the low grade heat left after power generation for secondary applications such as desalination.

I haven’t been able to find any comparisons of thermochemical energy storage to other storage mechanisms, so its hard to e certain how much of a boost (if any) this process gives compared to the alternatives.

Dr Keith Lovegrove from ANU mentioned some details regarding the solar dishes used in a talk on “Concentrating On Solar Thermal as a Solution to Climate Change” at the “Zero Emission” Conference in Melbourne last year.

A quick comment on why ANU advocates dishes, rather than other alternatives. Essentially if you go through the numbers, we pick up a higher optical efficiency and higher thermal efficiency in the receiver and that also propagates through. Our turbines will be the same as anyone else’s turbines but at the end of the day, we think we’ll get twice the electrical output per area of mirror. So that’s just in case you’re following that route. …

Where is solar thermal power going? I think we can learn from the wind industry. It’s very similar. It’s about manufacturing, the use of steel and glass and not rocket science. Wind industry has grown exponentially and costs have declined. And we can expect the same. …

Here’s a thought. We could actually export solar energy. How would we do that? Well, we would do that by using, for example, solar thermal systems can gasify biomass and even, dare I say it, gasified coal, in which case the final energy content is a mixture of solar and fossils. You can synthesise all that stuff into methanol and ship it overseas and quite literally power Japan, given that they’re 40% dependent on Middle Eastern oil at the moment and not very happy about that. It’s quite conceivable to imagine Australia as an exporter of solar energy.

I’ll close with a quote from Thomas Edison back in 1910 (Source: Interview in Elbert Hubbard’s Little Journeys to the Homes of the Great):

Some day some fellow will invent a way of concentrating and storing up sunshine to use instead of this old, absurd Prometheus scheme of fire. I’ll do the trick myself if some one else doesn’t get at it. Why, that is all there is about my work in electricity–you know, I never claimed to have invented electricity–that is a campaign lie–nail it!

Sunshine is spread out thin and so is electricity. Perhaps they are the same, but we will take that up later. Now the trick was, you see, to concentrate the juice and liberate it as you needed it. The old-fashioned way inaugurated by Jove, of letting it off in a clap of thunder, is dangerous, disconcerting and wasteful. It doesn’t fetch up anywhere. My task was to subdivide the current and use it in a great number of little lights, and to do this I had to store it. And we haven’t really found out how to store it yet and let it off real easy-like and cheap. Why, we have just begun to commence to get ready to find out about electricity. This scheme of combustion to get power makes me sick to think of–it is so wasteful. It is just the old, foolish Prometheus idea, and the father of Prometheus was a baboon.”

When we learn how to store electricity, we will cease being apes ourselves; until then we are tailless orangutans. You see, we should utilize natural forces and thus get all of our power. Sunshine is a form of energy, and the winds and the tides are manifestations of energy. Do we use them? Oh, no! We burn up wood and coal, as renters burn up the front fence for fuel. We live like squatters, not as if we owned the property.

There must surely come a time when heat and power will be stored in unlimited quantities in every community, all gathered by natural forces. Electricity ought to be as cheap as oxygen, for it can not be destroyed. Now, I am not sure but that my new storage-battery is the thing. I’d tell you about that, but I don’t want to bore you…

Cross-posted from Peak Energy.

Below is 4th in a series of installments by Professor Charles Hall of the SUNY College of Environmental Science and Forestry and his students attempting to update the ‘balloon graph‘ of EROI x Scale for fossil and renewable energy sources with help from theoildrum.com readership. Todays post deals with solar energy, specifically: Hydropower, Passive Solar, Photovoltaic, and Wind energy. Next will be Geothermal and Wave energy systems.
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Previous articles/commentary from this series:

At $100 Oil, What Can the Scientist Say to the Investor?
Why EROI Matters (Part 1 of 5)
EROI Post -A Response from Charlie Hall
EROI Part 2 of 5 - Provisional Results, Conventional Oil, Natural Gas
Unconventional Oil: Tar Sands and Shale Oil - EROI on the Web, Part 3 of 5
The Energy Return on Nuclear Power

Introduction to Solar Energy

(Charles Hall)

The sun is of course the main source of all of the energy that humans depend upon. Most importantly the sun runs the great systems of climate, hydrology and ecosystems that define and create the conditions within which the human economy must operate. In the distant past, solar energy generated fossil fuels and much of the mineral concentrations that we depend upon. In a beautiful book “A Forest Journey”, John Perlin traces the historical dependence of emerging human civilizations on forests as well as the crashes of civilizations that commonly followed the over-exploitation of forests and the soils they made. At issue on TheOilDrum today is the energy return on investment for the production of “industrial energy” from modern solar energy. By ‘industrial’ we mean electricity and heat more or less equivalent to what we get today mostly from fossil fuel. The five main sources of such “industrial” solar energy are usually thought to be hydroelectric power, passive solar, photovoltaics, wind and various types of biomass. We examine the first four of these in todays oildrum posting, and biomass at a later date. Since the EROI of wind has already been analyzed (and I might add more throughly than we have found possible for what we give today) by Cleveland and Kubiszewski, we present results for hydropower, photovoltaics (briefly) and passive solar. As usual we are doing this to seek additional references to bolster our analysis.

APPENDIX G.

HYDROPOWER SUMMARY

Billy Schoenberg, SUNY-Syracuse

Definition: “The electric current produced from water power” (Gulliver and Arndt, 2004). Because the sun evaporates water, mostly from the ocean, and through winds carries the water vapor up into the atmosphere and to the mountain tops where much of the world’s rain falls, hydropower is most properly considered solar energy. It is different from other solar energy in that it is relatively easily captured and turned into mechanical or electrical power, and relatively easily stored as elevated water behind a dam.

Hydropower currently accounts for approximately 6% of world energy consumption. Hydropower projects may be large or small scale (usually 5MW or less capacity), and may involve either construction of a dam, reservoir and/or tunnels to hold back and reroute water through a turbine reservoir (the usual), or “run of the river”, which does not involve the construction of large dams or tunnels. Large scale hydro projects, usually involving dams and reservoirs, are the most well-researched.

Resource base

Hydropower has the technical potential to provide up to 3800 GW of power globally, but only ~2500GW is considered economically feasible. Of that only 720 GW are currently installed worldwide. Thus globally, there are many undeveloped dam sites with hydropower potential although in the US the majority of the best sites are already developed. Much of the remaining technical potential is small-scale hydro which can be placed in most streams or rivers of at least moderate size and flow. Theoretically, hydropower at some level could be accessible to any population with a constant supply of flowing water. In practice the low price of fossil fuels, particularly the low investment cost, and the environmental and social costs of dams, has meant that fossil-fueled projects are much more common.

EROI

The EROI of hydropower is very site-specific. Because hydropower is such a variable resource, used in a multitude of different geographical conditions, and involves such different technologies, one general EROI ratio is not applicable to describe all projects. Reported EROI values range from about 11.2 to 267 (both quality and not quality corrected for the fact that the output is electricity and the input is mostly oil or other fossil fuels) (Cleveland et al., 1984) and (Gagnon et al., 2002). For specific favorable sites in Quebec EROI has been reported at 205:1 (for a reservoir type) and 267:1 (for a run of the river type). It is not known if these values are quality corrected, if quality corrected these numbers, would be three times as high. Thus the EROI for favorable or even moderate sites apparently can be very high, especially if the environmental or social effects are not included.

Economics

Hydropower differs from many other energy sources in that the major investments of energy and dollars occur when the plant is constructed, and there is little energy used in maintenance and operations. In general, hydroelectric power is cheaper than other sources of electricity (about 4 cents per KWh in 2000 vs. two to three times that for electricity from other sources). Since hydropower technology has been mature since the 1930’s there are probably not large changes in EROI over time except from the decreasing quality of sites used as the best ones are developed, and from small incremental changes in turbine design.

Environmental impacts

There is a large divide in the literature as to the costs and benefits of hydropower. On one side of the debate there are those who see hydropower as a clean, renewable source of energy, with only moderate environmental or social impacts. Others see hydropower as a scourge to society with environmental impacts that can be as large or larger as some conventional fossil fuels. The proponents of hydropower speak of its minimal emissions (especially CO2), renewable nature, and its contributions to water supply and irrigation. In addition they say the impacts on people and fish can be minimized when planned properly.

Hydropower’s detractors cite the effects it has had on migratory fish such as salmon, the contributions reservoirs make to greenhouse gas emissions and the harm it has done to displaced people, especially in the third world. The global effects of hydropower center around its carbon emissions and its potential to contribute to global warming, while the regional effects are centered around reservoir creation, dam construction, water quality changes, and native habitat destruction. Much of the debate centers around hydropower’s effects on people and whether or not a constant supply of water for power, irrigation or drinking is worth the relocation of millions of individuals. Nevertheless most analysts agree that there is a place for additional electricity produced from hydropower in the future.

The majority of environmental impacts upstream are due to the flooding of the river valley and creation of a reservoir. The reservoir completely destroys any terrestrial ecosystems that were once present in an area. In addition sediment and nutrients get trapped behind the dam causing the dam to become less efficient over time and the potential eutrophication of the reservoir if the dam and watershed are not managed properly.

Environmental impacts also occur downstream. The alteration of the river flow and the increased erosive power of low-sediment water cuts new channels into the riverbank sometimes causing massive amounts of erosion. Or in some cases the dam will completely dry up the river below, killing all aquatic species and forcing any terrestrial organisms to migrate in order to find water. In addition some hydropower facilities operate on irregular schedules creating very un-natural pulses of water through the ecosystem, which most strongly effect the aquatic species especially the invertebrates. In addition to these concerns there is the occasional supersaturation of gases downstream of dams causing a “bends”-like condition (e.g. nitrogenembolism) in fish and other aquatic organisms.

The amount of carbon emissions produced is very site specific, varying by as much as 500 times and correlated mostly with the latitude of the construction site and the density of vegetation that was found in the flooded area. The highest producers of carbon emissions, generally methane, appear to be those in Brazil or places closer to the equator so that the majority of the best large-scale sites remaining are most likely to be large emitters of CO2 from reservoir construction. A range of carbon emissions per kilowatt hour produced are available and those numbers range from 1 to 34 g CO2/kWh with more usual numbers in the range of 2 to 9 g CO2/kWh. This is substantially lower than fossil fuel sources

Social Impacts

Large dam construction almost inevitably comes at the cost of the relocation of people who live in the river valleys upstream which get flooded during reservoir creation, or sometimes for those who live in the flood plains downstream. Some 40-80 million people have been relocated and otherwise impacted by the various associated general, gender/class and health effects. For example, men are hired for several months or years to work dam construction which forces families apart, and relocation often forces women to leave not only their land, but their husbands, sons and fathers. The largest health effects come after the dam is completed, often generating a perfect habitat for many parasites or vectors for those parasites in the suddenly still water. A second category of post construction health risks is dam failure or collapse. This risk is largest in China, where dams that were constructed rapidly from 1950-1980 without much planning or good engineering, killed up to 250,000 when a few failed.. The risk of failure is always present at the rate of about 1 in 10,000 per year.

In summary dams can have very high EROI and have the potential to produce a moderate amount of additional, high quality electricity in the developing world, but are often associated with extremely high environmental and social costs. Many authors see run of river hydropower as the future because it does away with massive relocation projects, minimizes the effects on fish and wildlife and does not release any GHG emissions (because there is generally no reservoir) while retaining the benefits of a clean renewable cheap source of energy. On the other hand the relatively low power density available in run of the river projects relative to the high heads made possible with a dam limits the potential of this approach.

Table 1. Magnitude and EROI of hydroelectric power from various sources.
Click to Enlarge.

Adams, W. 2000b. Downstream impacts of dams. University of Cambridge, UK. Contributing Paper, Thematic Review I.1: Social Impacts of Large Dams Equity and Distributional Issues. WCD Website:http://www.damsreport.org/docs/kbase/contrib./soc195.pdf.

Brookshier, P., Hydropower Technology. Encyclopedia of Energy. ED. Cutler J. Cleveland, Elsevier United States. 2004 333 – 343.
Cada, G. , Sale, M. , Dauble, D. , Environmental Impact of Hydropower, Encyclopedia of Energy. ED. Cutler J. Cleveland, Elsevier United States. 2004 291 – 301.

Cleveland, C. J., Costanza, R., Hall, C. A. S., Kaufmann, R., 1984. Energy and the U.S. economy: A biophysical perspective. Science. 225, 890-897.

Denholm, P., and Kulcinski, G. L. (2004). Life cycle energy requirements and greenhouse gas emissions from large scale energy storage systems. Energy Conversion & Management. 45, 2153-2172.

Edwards, B. K., Hydropower Economics, Encyclopedia of Energy. ED. Cutler J. Cleveland, Elsevier United States. 2004 283-291.

Gagnon, L., Belanger, C., Uchiyama, Y. (2002) Life-cycle assessment of electricity generation options: The status of research in year 2001. Energy Policy 30: 1267-1278.

Gilliland, M. W., Klopatek, J. M., Hildebrand, S. G., 1981, Net energy of seven small-scale hydroelectric power plants Oak Ridge National Lab., TN.

Gulliver, J. S. , Arndt, R. E. A. , History and Technology of Hydropower, Encyclopedia of Energy. ED. Cutler J. Cleveland, Elsevier United States. 2004 301-315.

IEA, 2002. Environmental and health impacts of electricity generation. A part of: Implementing agreement for hydropower technologies and programmes.

Kaygusuz, K., 2002 .Sustainable development of hydropower and biomass energy in Turkey. Energy Conversion & Management. 43, 1099-1120.

Montanari, R., 2003. Criteria for the economic planning of a low power hydroelectric plant. Renewable Energy. 28, 2129-2145.

Odum, Kylstra, Alexander, Sipe, Lem, Brown, Brown, Kemp, Sell, Mitsch, DeBellevue, Ballentine, Fontaine, Bayley, Zucchetto, Costanza, Gardner, Dolan, March, Boynton, Gilliland, Young 197? Net Energy Analysis of Alternatives for the United States

Pimentel, D., Rodrigues, D., 1994. Renewable Energy: Economic and Environmental Issues. Bioscience. 44-8.

Ramage, J. Chapter 5, Hydroelectricity, Renewable Energy. ED. Godfrey Boyle Oxford University Press. 2004 148-192.

Sleigh, A. C. , Jackson, S. , Resettlement Projects, Socioeconomic Impacts of ydropower, Encyclopedia of Energy. ED. Cutler J. Cleveland, Elsevier United States. 2004 315-325.

Sommers, G. L. , Hydropower Resources, Encyclopedia of Energy. ED. Cutler J. Cleveland, Elsevier United States. 2004 325-333.

Schilt, C. R., 2007. Developing fish passage and protection at hydropower dams. Applied Animal Behaviour Science. 104, 295-325.
UNEP, 2007. Dams and Development: Relevant practices for improved decision making. UNEP, Narobi Kenya.

Weisser D., 2007. A guide to life-cycle greenhouse gas (GHG) emissions from electric supply technologies. Energy. Article In Press.

APPENDIX G-1

PASSIVE SOLAR

Kallistia Giermek SUNY ESF

Introduction

Definition: “The use of solar energy by passive means to reduce the heating demand of a building.”

A passive solar building is designed to capture and optimize the heat and light available daily from the sun. To qualify as a passive solar system means to accomplish this without use of any collectors, pumps or mechanical parts (Cleveland 2006.) The only difference between a conventional house and a passive solar house is design. When building a passive solar house there are two main design points to take in to account: one, to maintain comfortable average equilibrium temperature by balancing heat gains and losses and two, to minimizing temperature fluctuations both over the 24 hour cycle (Wayne 1986).

Passive solar architecture is much easier to execute when designed into a house rather than added on after construction. In general but not necessarily, passive solar homes take more time, money and design effort to build. Over time these extra cost will pay for themselves with energy savings (Smith 2001). At this time it does not seem possible to give the number of houses that are building a substantial amount of passive solar into the design but it cannot be very large.

History Time line of Passive Solar Energy:

History Time line of Passive Solar Energy
Click to Enlarge.

Techniques

:

Passive solar heating: While passive solar designs and techniques vary by location and regional climate, the basic styles remain the same. The three basic techniques include direct gain, indirect gain and insulated gain. Each of these techniques utilizes different aspects of the fundamental laws of heat while all have one common factor, general construction elements which are :

1) Large areas/volumes of concrete or other thermal mass. This is necessary because during the winter concrete floors and walls act to hold heat in and radiate it during the night when the temperature drops. During the summer the concrete serves to absorb excess heat.

2). Windows with high thermal resistance such as highly efficient glazing.

3) Air tightness to avoid overheating in summers. Studies have shown that if designed properly the need for mechanical cooling can be eliminated. Proper ventilation is key. Moveable shades can also be added to reduce to cooling loads. (Smith 2001)

4) Natural ventilation.

5) Shading by use of an overhang or movable shutters. Because the summer sun is higher in the sky relative to the winter sun, overhangs can provide shading during the hot summer months. The overhang should be built to intersect the angle of the summer sun (United States DOE 2000.)

6) Orientation of the long axis of the house east to west.

7) Large glazed areas on the south facing side and fewer windows on the northern side (Smith 2001). Although true southern exposure is preferred, it is not mandatory. If the building is oriented 30º of due south (in the Northern Hemisphere), it will still receive 90% of the optimal winter sun.

Incorporating Active components:
Often the addition of a few active components can greatly increase the energy gained for a specific passive solar design. Fans and pumps and properly designed heat exchangers can be used to circulate air and heat to reduce indoor pollution

The three dominate forms of passive solar heating include:

Direct Gain: Direct gain is the simplest of the passive solar designs. Sunlight enters the house through the aperture (a large glazed surface) – usually on the southern facing side. This sunlight then strikes a source of thermal mass (walls and/or masonry floors) which is then stored as solar heat. To best absorb solar heat, the surface of the floors is usually dark and carpet should be avoided. As night approaches and the temperature decreases the heat stored in the floors and walls will radiate into the room (United States DOE 2001.)
To avoid overheating during the summer some form of shading is very important. Overhangs are a very popular method of avoiding over heating. Other methods include deciduous plants and/or trees covering the southern windows that would shade during the summer and lose their leaves during the winter to allow the sun in.

Pros: Very simple, does not require extensive planning or design and it is possible to utilize direct gain and day lighting with the same design.

Cons: Increased glazed area leads to greater heat loss and so greater fluctuations in household temperature. Direct gain has the largest temperature fluctuations of any of the passive solar techniques. (Ferbadez-Gonzalez 2004). Without proper shading method overheating during the summer is very common. Direct gain works only in areas where southern exposure is available, so it would not work in dense poorly planed cities or densely forested areas (Perlin 2004).

Trombe Walls: Passive solar houses tend to have temperature fluctuations greater than the average conventional house and 75% of heat energy is needed at night (Wayne 1986). To compensate for this temperature fluctuations different heat storage technologies such as the Trombe Wall have been developed (Everet 2004.) A Trombe Wall is a thick wall with a very high thermal mass. It is usually concrete, masonry or wallboard. It can even be water placed between a window and the living space leaving about a one inch area between the window and the wall. Heat penetrates through the glass and is stored in the Trombe wall. Sometime slits are cut into the Trombe wall to increase circulation of warm air when the indoor temperature falls below the temperature of the wall, the heat will begin to radiate into the room. Heat will travel through a masonry wall at the rate of 1 inch per hour. Therefore the heat that was absorbed in an 8inch wall at noon will enter the room at eight o’clock just in time to replace the heat lost from the sunset. An overhang much like that of the direct gain method is also beneficial to the Trombe wall system (Everet 2004.)
Pros: Heat it stored for the cooler hours of the night.

Cons: Trombe walls often block out most of the potential direct gain heat and daylighting and are very hard to add into a preexisting house.

Insulated gain (Conservatories): Also known as a sunspace, solar room or solarium (United States DOE 2001) a conservatory is essentially a green house attached to the south facing side of the house. It consists of a large open window on the house side to circulate the warm air throughout the house. Conservatories, due to their large glazed surface, experience a great deal of heat gain and loss. The use of thermal mass and low emission windows can control these fluctuations. Heat is stored in the house itself and in any source of thermal mass such as the back wall of conservatory, floors, etc.

Pros: Conservatories can be built as a part of an existing house or a new home. (United States DOE 2001), and the large heat gains in sunspace can be moved to other parts of the building easily with a fan

Cons: Worst overall performance of all the strategies (Ferbadez-Gonzalez 2004)- i.e. has a high heat loss

Other uses of natural energy in buildings:

Passive solar cooling: Saving money and conserving energy by heating with passive solar during the winter is best complemented by passive cooling during the summer. In many climates opening windows during the night helps to flush out heat and bring in cool fresh air, an aperture that can be opened at the top can be very helpful in doing this. To keep this cool air inside it is best to close the windows and shades in the morning to prevent further heating from solar energy (United States DOE 2000.)

Daylighting: The use of various apertures to let in sunlight to building interiors is as old aas architecture, but before the twentieth century replacing daylight with artificial light was very expensive. Today with cheap electricity daylighting has been vastly neglected despite its positive attributes. Most modern office buildings and schools are built to rely heavily on artificial light. The primary daylighting strategies are location, large glazed areas and orientation. Daylighting is most widely used in lower level schools. This is because schools are most heavily used from 8am – 4pm when the sun is out and ready to be used (Hastings 2003, Everet 2004).

Pros: Obvious savings in energy cost. Increased performance and increase test scores in students have been reported. Natural heat and light promotes better health and physical development (Plympton 2000).

Cons: Site specific.

Limitations:

Location: clouds diffuse solar energy making less readily available. For temperature, Passive solar heating alone cannot heat a home to comfortable temperatures where harsh winters are the rule (Smith 2001.) Available southern exposure limits the number of houses that can be so constructed since a house on the northern facing slope of a hill cannot absorb the strongest sun which comes from the south. Daylighting can work at any latitude although obviously in the winter it has less utility in Northern areas.

Air tightness: The most successful passive solar homes are airtight, however, if the house is airtight the threat of pollutants becoming trapped inside increases (Everet 2004.) This can be overcome by the use of fans and pumps to circulate air around the dwelling. This would lead to a hybrid passive/active solar design.

Net Energy

Because passive solar design is incredibly site specific it is very difficult to determine just what the EROI might be. Rarely does an architect get quantitative feedback on the system, finding a numerical Energy Return on Investment (EROI) is nearly impossible.(Lyng 2006, Spanos 2005). Nevertheless if various passive solar designs are built into the house from the beginning then fairly large energy gains can be obtained with little or no investments. In other words it may cost little to put most of the windows on the south side, although that may greatly increase the gain.

An EROI could be calculated for a case specific location by dividing the energy saved each year over the energy inputted to make that house passive solar. The EROI for a passive solar would be very high because building passive solar is a one time expense and houses last half a century or more. Studies have shown that the energy savings can range anywhere from 30-70%, this would cause the EROI to change vastly from case to case. If the payback period is five years and the house lasts for 50 then the EROI would be, apparently, 10:1.

Table 1.(blue) Energy Savings from daylighting -
Table 2.(green) Energy Savings for Passive Solar Energy
Click to Enlarge.

Economics:

New Buildings: Some studies have shown that the prices for building a passive solar home are the same or less than other custom homes. Other studies say passive solar homes have an average of 3-5% added cost. Over time these added costs will pay for themselves in energy savings (Pimentel 1994.) Because the investment is a one time expense, the dollar return on dollar investment (DRODI) increases incrementally each year. The Tierra I house built in Colorado demonstrated a DRODI that increased by 125:1 each year after construction. After 16 years this house saved $2000 for every extra dollar spent to make the house passive solar. (Smith 2001.) While this example highlights the potentially high energy return from passive solar, it also shows that there is an upper limit to its scalability. One cannot use one house as a vector to create Gigajoules of extra electricity, but only the heat, and perhaps some extra, that the occupants of the house requires. But if used on all new houses, the overall scale could be quite large in replacing other fuels.

Adding on to preexisting structures: Installing a passive solar system into the design of a new home is generally cheaper then fitting it on to an existing home. Saving can still be accomplished but prices are generally higher and savings are lower. The easiest method to attach on to an existing home is a conservatory which is also the least efficient method of passive solar heating (Pimentel 2001.)

Environmental Impacts:

Positives: The design and energy efficient construction for passive solar homes decreases cooling loads and reduces electricity consumption which leads to significant decline in the use of fossil fuels. For example, in Colorado 94% of electricity consumed is produced by coal fired generation power plants. Estimates show that at 4218 kg of CO2, 14.5 kg of SO2, and 13.6 kg of NO2 can be avoided in a single Colorado home with passive solar technology (Whalen 2001).

Negatives: In order to utilize the sun to its fullest potential, a passive solar home must be free of any obstacles that block sunlight, such as other houses or tree. Passive solar homes work best in lightly populated areas making them more land intensive. Thus a series o f solar homes all facing south would presumably take up more land area then if they were oriented randomly.

Social Implications:

Daylighting:
Most of the modern workforce is based indoors with artificial light. In most cases workers feel uncomfortable leading to a rising trend or complaint amongst works in the idea of sick building syndrome, making people uncomfortable in their workplace and hence less productive. Passive solar buildings can provide a healthy and therefore more productive building. (Currie 2002).

In conclusion, it is obvious that designing buildings from the start to take advantage of natural heating and lighting, and to use more insulation and solar mass, have a tremendous possibility to reduce energy demand in the future. The “Green buildings” program is a very active and interesting field. But it should be realized that each new building, no matter how green, increases the energy that we use to make and in buildings, except in the sense that as the housing stock turns over we have an opportunity to replace it with less energy intensive buildings. Probably all possible decreases in the energy intensity of buildings are more than made up by increases in square footage per person (Jevons Paradox). Probably population growth and the broad economic patterns we have experienced in recent years of building and then overbuilding real estate has had far more impact on our energy use in buildings. These issues need to be on the “green building” agenda.

Annotated Bibliography:

Cleveland, Cutler J. Morris, Christopher. “Passive Solar Energy” Dictionary of Energy. Oxford: Elsevier, 2006. pg. 322- 323.

Currie, Robert, Bruce Elrick, Mariana Ioannidi, and Craig Nicolson Nicolson. “Passive Solar.” Renewables in Scotland. May 2002. University of Strathclyde. .

Everet, Bob. Boyle Godfrey. “Solar Thermal Energy” Renewable Energy. The Open University: Oxford. Second Edition. 2004 pg 18-53.

Ferbabdez-Gonzalez, Alfredo. Analysis of the Thermal Perforamce and Comfort Conditions Produced by Five Different Passive Solar Heating Strategies in the United States Midwest. ASES Solar Conference, 2004, Solar Energy. .

Lyng, Jeff. 2007. Governors Energy Office, State of Colorado, Personal communication.

Hastings, Sara. Daylighting Analysis in the BigHorn Home Improvement Center. National Renewable Energy Labortoary. Golden, Colorado, 2003. pg. 1-22. .

Perlin, John and Cleveland, Cutler. “Solar Energy, History of.” Energy Encyclopedia, Oxford: Elsevier 2004. Vol. 5 pg. 607-622

Pimentel, David, G. Rodrigues, T. Wang, R. Abrams, K. Goldberg, H. Staecker, E. Ma, L. Brueckner, L. Trovato, C, Chow, U. Govindarajulu, and S. Boerke. “Renewable Energy: Economic and Environmental Issues.” BioScience 44 (1994): pg. 536-547. .

Plympton, Patricia, Susan Conway, and Kyra Epstein. Day Lighting in Schools: Improving Student Performance and Health At a Price Schools Can Afford. American Solar Energy Societ Conference, 16 June 2000, National Renewable Energy Laboratory. .

Smith, Michael W. Analysis of the Thermal Performance of Tierra I — a Low-Energy High-Mass Residence. National Renewable Energy Labortoary. Golden, Colorado, 2001. pg. 1-79..

Spanos, Ioannis, Martin Simons, and Kenneth L. Holmes. “Cost Savings by Application of Passive Solar Energy.” Structural Suvey 23 (2005): pg. 111-130.
.

United States. Department of Energy (DOE). Passive Solar Design: Technology Fact Sheet. Dec. 2000. .

United States. Department of Energy (DOE). “Passive Solar Design for the Home”. Feb. 2001. 30 May 2007 .

Wayne, Gary, Hall, Charles, Behler, David. “Solar Energy.” Chapter 12 in Hall, Cleveland and Kaufmann. Energy and Resource Quality: The Ecology of the Economic Process. John Wiley & Sons: 1986 pg 285-305.

Whalen, Peg. “Daylighting in Schools Reduces Costs, Improves Student Performance.” Caddet. 24 Nov. 2004. National Renewable Energy Laboratory. .

APPENDIX G-2.

Photovoltaics

.

Charles A. Hall, SUNY-ESF, Syracuse NY

It was not our original intent to undertake an analysis of photovoltaics because we were to leave that analysis in the hands of a colleague more competent in that field. However that analysis has not been made available so we are presenting a brief summary of our own analysis.

EROI

A typical analysis is from Batisti and Carrado (2004) for “a reference system (of) a multi-crystalline silicon (mc-Si) photovoltaic system, gridconnected and retrofitted on a tilted roof in Rome (Italy; latitude: 41 (degrees) 85 (minutes) North, yearly average global insolation on a horizontal plane: 1530 kWh/m2 yr). The assumed efficiency of the cells is 10.7 percent and the materials required as 12.6 Kg/M2, with a mean output of 0.106 Kw per square meter. No storage device was included. For this they estimate the energy costs associated with producing silicon in the form required as well as the structural aluminum., steel, glass and so on required, including the energy required to transport, install and eventually landfill the materials. Their results are typical: “All the analyzed configurations are characterized by environmental pay back times one order of magnitude lower than their expected life time (3–4 years vs. 15–30 years).” From this I calculate an EROI of 4.75:1 to 10:1, which is similar to other estimates I have heard, although I have also heard estimates that vary from 1:1 to perhaps 20:1, with much higher ratios “projected”.

Some 76 percent of the energy required to generate the silicon module is the energy required to make the raw silicon. These and other authors indicate that at this time the principle source of silicon for the photovoltaic industry is scraps from the computer chip industry. If the industry is to expand greatly other dedicated sources of silicon must be generated, with presently unknown effects on the energy cost.

The Future

Given that presently despite the enormous growth of photovoltaics, the annual increment of oil, gas and coal is usually greater than the total of all photovoltaic production of energy the increase in capacity needed for photovoltaics to make a large difference is enormous. A particular concern is whether there would be material shortages with a very large growth. For example, gallium arsenide is currently more or less the material of choice for a doping material to apply to silicon. Curiously, or not so curiously, this material has the same absorbance spectra as chlorophyll. A glance at the periodic table show this element to be under aluminum, and the principle source is aluminum mining and purification. But if the industry were to increase by a factor of ten other sources would have to be found, and, presumably, its cost would increase dramatically. Likewise if we were to attempt to replace liquid fuels with electricity an enormously greater amount of copper would be needed. The price of copper is already escalating sharply under pressure from the construction industry of China and it is not clear what a greatly increased demand might do. Similar issues would apply to the many other elements that might be needed to obtain higher efficiencies in the industry (Andersson 2000).

An additional cost element would be the energy costs required for storage. At present lead-acid batteries are typically used for photovoltaic systems, but other storage systems include pumped storage (i.e. pumping water up hill for later generation of electricity), compressed air or flywheels. Many of these systems are quite promising, but would require considerable development.

References

Battisti, R. and A. Corrado. 2005. Evaluation of technical improvements of photovoltaic systems through life cycle assessment methodology. Energy 30: 952–967

Frankl P. Life cycle assessment of photovoltaic systems. PhD Thesis, Rome, Italy, University of Rome1 ‘La Sapienza’;1996 [in Italian].

Meijer A, Huijbregts MAJ, Schermer JJ, Reijnders L. Life-cycle assessment of photovoltaic modules: comparison of mc-Si, InGaP and InGaP/mc-Si solar modules. Prog Photovolt: Res Appl 2003;(11):275–87.

APPENDIX G-3

WIND

Recently an excellent meta-analysis on the Energy from Wind: A Discussion of the EROI Research was completed by Ida Kubisewski and Cutler Cleveland. The details can be reviewed in theoildrum.com’s link above. Here is the salient table showing the EROIs of various studies and conditions:

EROI From Wind - Meta-analysis
Click to Enlarge.

The average EROI for all studies (operational and conceptual) is 24.6 (n=109; std. dev=22.3). The average EROI for just the operational studies is 18.1 (n=158; std. dev=13.7).

CONCLUSION

We find in solar (industrial) energy a very large potential but a rather small application (so far). The greatest use is traditional biomass (perhaps about 5 percent in the US) and hydropower. In general high EROI sites in the United States were developed by the middle of the last century and a further expansion is probably limited by environmental considerations. (Globally the potential is much more). In the United States existing wind power seems to have a rather good EROI (18:1) although that is likely to be decreased substantially if issues related to storage are factored in. Present generation photovoltaics have a moderate EROI (around 8:1 but with great variability and uncertainty). Both wind and photovoltaic systems appear to have a large potential for improving their EROI. The greatest potential, however, is for passive solar, although this issue seems not to have been analyzed very often using EROI explicitly. There are many reasons to favor a solar future and it is probably quite possible to get there, but we need a much more comprehensive analysis of the issues of availability and storage if applied on a very large scale.

ND Study: 167 Billion Barrels of Oil in Bakken

The Bakken shale formation in North Dakota holds up to 167 billion barrels of oil but only about 1 percent of it can be recovered using current technology, a new study says.

The study released Monday said current technology could lead to the recovery of about 2.1 billion barrels in North Dakota’s portion of the formation, where oil-producing rock is sandwiched between layers of shale about 10,000 feet under the ground. The estimate of recoverable oil included in the study by the state Department of Mineral Resources was similar to that of a federal study released earlier this month.

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We should warm to the idea of melting poles

So quickly is the ice melting that the prospect of a navigable, ice-free Arctic Ocean is no longer the stuff of fanciful imagination, and has been the topic of two National Oceanic and Atmospheric Administration National Ice Centre-sponsored conferences (Naval Operations in an Ice Free Arctic symposium, April, 2001; Impact of an Ice-Diminishing Arctic on Naval and Maritime Operations symposium, July, 2007).

Within our lifetimes, and possibly in less than a single generation, we may witness the opening up of Arctic sea lanes that are fully navigable year-round: The strategic, economic and diplomatic consequences will be enormous.

Averting an energy crisis

Gas prices are skyrocketing; the average price of a gallon of regular soared past $3.50 last week. Venezuela has threatened to cut off oil exports to the United States. The dollar has fallen by 30 percent against the euro over the past two years. Could things possibly get worse?

Yes. Real-world events underscore the nation’s acute energy security vulnerabilities. Over the last year oil prices have surged in a short period of time without any single precipitating event. The effects are stark. Every $10 increase in the annual price of a barrel of oil costs the economy $75 billion.

Next few years may be tough

It’s one thing to be short on oil, significant curtailments will allow our infrastructure to continue operating. There are certain things we can do without.

The British between 1939 and 1945 made significant concessions; they lived through food rationing, blackouts and bathing in cold water.

But the only thing that Winston Churchill and his advisors really worried about was if food imports were cut off. And that is what the Germans were aiming for. Both sides knew that when the amount of daily calorie intake fell below a certain threshold, nothing could contain social unrest.

South Africa: ‘No need for 60% power hike for domestic users’

JOHANNESBURG - While SA households are already paying excessively high prices for their electricity many of the country’s industries pay up to 275% less for power.

Add to this the fact that Eskom is selling about a third of its locally-generated power to neighbouring countries, there is “absolutely no need” for domestic consumers to face a more than 60% increase, Solidarity spokesman Jaco Kleynhans said.

Delegation, truckers, speak up against diesel costs

Rep. Tom Allen (D) met the truckers at I-95 Exit 25 in Kennebunk.

Allen has called for an “immediate federal investigation” of price fixing and manipulation, sending letters to the chairman of the Federal Trade Commission and the Commodity Futures Trading Commission, among others.

Cyprus: Exceptional price rises coupled with shortages

Today, as oil hovers a new record high of $120 a barrel and a two-day United Nations crisis meeting gets underway to address the worsening food crisis, Cyprus is urgently struggling to come up with a course of action to answer the desperate need for new water supplies.

Auto Industry Working Hard to Make an Electric Vehicle Battery

To an engineer, it looks obvious.

Gasoline packs 80 times more energy per kilogram than a lithium-ion electric vehicle battery. It holds 250 times more energy than a common lead-acid battery. So, it’s a no-brainer. Batteries can’t possibly deliver the energy needed to power the future of the auto industry, right?

Wrong. With vehicle exhaust being blamed for global warming and with concerns over foreign oil availability growing, the auto industry has re-ratcheted up its efforts to develop an electric car and the battery still sits smack-dab in the middle of Alternative Energy Highway.

Q&A: Wave power

How much of our energy needs could wave power meet?

The technology has only been available for a few decades, yet we could meet almost 10% of our energy needs from wave power, at a cost similar to current prices.

Gwynne Dyer: Climate change could fend off peak oil crisis

Last week, Hamish McRae, one of the world’s best economic journalists, declared in The Independent: “Hardly anyone a year ago successfully predicted the rise in the oil price to $120 a barrel—in fact I have not found a single forecast of that.” Regular readers of this column may recall that I predicted oil at over $100 a barrel in April 2006, and well north of that price in another column in July 2007.

I am the most modest of men, but I reckon this gives me the right to offer some further forecasts. So I predict that the price of oil will soon fall—a bit. So far, the economies of the “Brics” (Brazil, Russia, India and China) are still growing strongly, but the old industrialized economies are definitely heading into a recession, and they still consume most of the oil.

Supply side to blame for high oil prices

Despite what many pundits say, oil demand is not really the central problem. True, there has been a huge shift in the sources of demand, away from the rich industrial countries and toward China, India, the Middle East and Russia. But the pace of aggregate demand growth in recent years has not changed significantly and, in fact, has slowed. In short, there has been no demand shock.

Rather, the real culprit is on the supply side. Unlike the sudden supply shocks of the 1970s, this crisis is the culmination of the gradual erosion in global capacity growth, which leaves oil demand chronically bumping up against stagnating production capacity.

IEA chief economist says oil prices unlikely to fall soon

WARSAW (Thomson Financial) - The International Energy Agency’s chief economist said on Tuesday it would be ‘very optimistic’ to expect prices of oil to fall within the next few months.

‘I cannot make official forecasts about oil prices but I can tell you that it would be very optimistic to expect that prices will go down in the coming months,’ Fatih Birol told reporters on a visit to Warsaw.

Scottish oil refinery strike ends

LONDON - Workers returned to the Grangemouth refinery in central Scotland on Tuesday after a 48-hour strike that forced the closure of a major North Sea pipeline system.

UNITE, Britain’s largest union, said further industrial action is possible unless refinery owner Ineos backs down in a dispute over pensions.

Record oil prices drive Shell 1Q profits up 25 percent

AMSTERDAM, Netherlands - Royal Dutch Shell PLC’s first-quarter profits rose 25 percent, Europe’s largest engery company reported Tuesday, on unheard of prices for a barrel of oil.

Shell said its average selling price of crude oil leaped by 66 percent to more than $90 per barrel from the first quarter a year ago.

Rockefeller family call for ExxonMobil shake-up

One of America’s most powerful families will call tomorrow for a sweeping shake-up at the top of ExxonMobil, the world’s largest company.

A group of descendants of John D Rockefeller, who founded its predecessor Standard Oil in 1870, will begin a campaign to split the role of chief executive and chairman of the board at Exxon, a role held by Rex Tillerson.

Russian crude producer LUKoil posts 73% net profit growth in Q1

MOSCOW (RIA Novosti) - Russia’s largest independent oil producer LUKoil said on Tuesday its net profit calculated to Russian Accounting Standards climbed 73% year-on-year in the first quarter to 13.231 billion rubles ($560 million).

Shell sees refining margins under pressure

LONDON, April 29 (Reuters) - Royal Dutch Shell (RDSa.L: Quote, Profile, Research) sees refinery margins under pressure for the next two to three years as new refining capacity comes onstream, but more modern plants will add value, the company said on Tuesday.

Peter Voser, chief financial officer of the Anglo-Dutch oil giant, said that he expected a more volatile refining environment over the next few years.

Petro-Canada’s Net Rises on Oil Prices, Production

(Bloomberg) — Petro-Canada, the worst performer among Canada’s largest oil companies, said first-quarter profit rose 82 percent on higher oil prices and production.

Net income climbed to C$1.08 billion ($1.07 billion), or C$2.20 a share, from C$590 million, or C$1.18, a year earlier, the Calgary-based company said today in a statement. Revenue rose 36 percent to C$6.62 billion.

Shell Examines Carbon Capture Project at Its Canadian Refinery

(Bloomberg) — Royal Dutch Shell Plc, Europe’s largest oil company, said it’s examining a carbon capture project at its Scotford refinery and upgrader in the Canadian province of Alberta.

The company is studying a plan nicknamed “Quest,” which would capture carbon at the 155,000-barrel-a-day upgrader and “transport it to a mature field for sequestration,” Chief Financial Officer Peter Voser said today on call with reporters. “We are looking into that and we are working on that.”