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Solar Cogeneration
www.SolarCogeneration.com

Solar Cogeneration Energy Systems

What is a "Solar Cogeneration" (or Solar CHP) energy System?

A Solar Cogeneration (or simply "Solar CHP") energy system combines a: 

1.  Solar Electric Power System with a 

2. Solar Water Heating System (which generates hot water with either solar thermal collectors or evacuated tube collectors)

for the best of both worlds. 

Our Solar Cogeneration energy systems provides a significantly higher return on investment, along with higher overall system efficiencies.

What is a "Solar Trigeneration" energy System?

A Solar Trigeneration energy system combines a: 

1.  Solar Electric Power System  with a 

2. Solar Water Heating System (which generates hot water with either solar thermal collectors or evacuated tube collectors)

and takes a Solar Cogeneration energy system one further step by adding and integrating either;

3.  Absorption Chillers or Adsorption Chillers, which receives some of the hot water from the Solar Water Heating System and provides the energy needed to make 38 degree chilled water for air-conditioning. 

We install our Solar Trigeneration^sm Energy Systems, for qualified commercial businesses, as well as  cities, schools and government facilities with our Zero Up-front Cost program.

For some customers - based on their present location, utility company and electric rate - we are able to reduce their electric rate by 10%. Even more for other customers.  Solar Trigeneration^sm Energy System!

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Solar Cogeneration
www.SolarCogeneration.com

Solar Cogeneration & Solar Trigeneration Energy Systems

We install our Solar Trigeneration^sm Energy Systems, for qualified commercial businesses, as well as  cities, schools and government facilities with our Zero Up-front Cost program.

For some customers - based on their present location, utility company and electric rate - we are able to reduce their electric rate by 10%. Even more for other customers.  Solar Trigeneration^sm Energy System!

We provide the answers to your questions about solar power and energy!

Does your; business, city, school, or electric utility want a more sustainable solar power and energy solution?

Are you interested in transforming your facility, campus or building(s) to "Net Zero Energy"™ buildings?

Does your city or school have a problem with rising electricity and energy expenses, but not have the financial resources to provide the necessary updates and upgrades to make your buildings more efficient?

Maybe you have already decided to go solar, but you have a lot of questions, and don't know where to start.  Call us, we have the answers to your solar questions.

What is the optimum solar solution?  There are hundreds of companies in the solar power and energy industry.....  Who do you call to help you with these questions to help you make the right decisions?

There's still more questions, that you may not have thought about..... which solar technology do you go with, and what is the return on investment? 

Are there any solar rebates, refunds, tax credits or other incentives available?

What about investors that might be interested in owning/operating and maintaining our solar energy system under a Power Purchase Agreement?

You have numerous questions and need the answers to help in the decision-making process regarding the solar power and energy system you want to install.  These decisions will have a long-lasting impact as the solar energy system that you install at your business or facility will probably be generating clean power for the next 40 to 50 years, if not longer!  So, the decisions that you need to make now regarding your solar energy system will be a decision that will be either a long-term asset or a liability, depending on the equipment you select and who you choose to install it. 

We can help cities, schools and commercial (and large residential) customers make the switch to solar!

And now, with our no up-front cost for our Solar Trigeneration^sm Energy System, we can also transform your building(s) to a "Net Zero Energy Building"™ and many times, actually REDUCE your present energy expenses by 10%, and possibly more!

Examples of buildings/facilities where our Solar Trigeneration^sm Energy Systems would benefit, include; universities, churches, data centers, shopping centers, schools, radio/television stations, food processing, warehouses, new real estate developments and subdivisions, and electric utilities - practically any commercial facility can be upgraded to one of our "pollution free power" systems featuring one of our solar energy systems,  including our Solar Trigeneration^sm system!

Call or email us, we can provide these answers. We are focused on providing the optimum solar energy systems for our clients. This begins with an initial review of your past 12 months energy/electrical bills. The next step would include a site visit which may include a Demand Side Management study and/or a Solar Feasibility Study which determines the optimum solar energy system for your facility or location.  Once the optimum solar solution(s) are determined, we then have a blueprint to proceed that could include our installing one of our Solar Cogeneration™ or Solar Trigeneration^sm energy systems.  Or for a city, real estate development or subdivision, or an electric utility, one of our utility scale power plants which might be a Concentrating Photovoltaic, Concentrating Solar Power or High Concentration Photovoltaic power plants.

What is "Net Zero Energy^sm?"

Net Zero Energy^sm - when applied to a home or commercial building, simply means that the home or buildings generates as much power and energy as they consume, when measured on a monthly or annual basis, and with an onsite, renewable energy system, such as our Solar Trigeneration^sm Energy System. 

What is a Net Zero Energy Building^sm?

A Net Zero Energy Building^sm produces as much energy as it uses over the course of a year. Net Zero Energy Buildings^sm are very energy efficient. The remaining low energy needs are typically met with on-site renewable energy. 

First of all, understand that there is no such thing as a "zero energy building!" EVERY building uses energy, or you may as well be in a cave!  

The important considerations are, 

1.  How efficient is the building?  

2.  How much energy does the building use, and how efficiently is it used?  

3.  How much "carbon free energy" or "pollution free power" is generated by the buildings' own onsite renewable energy system?

4.  What are the utility company's prices for the excess power generated and sent to the grid? 
(see: Net Energy Metering)

5.  How difficult is it to interconnect the renewable energy system of the building with the utility company's powerlines/electric grid?   

At the heart of a Net Zero Energy Building^sm is the idea that any building can meet its energy requirements from low-cost, locally available, nonpolluting, renewable sources, like our Solar Trigeneration^sm Energy Systems. Our Solar Trigeneration^sm Energy Systems are the idea whose time has come, to make Net Zero Energy Buildings^sm commonplace.

Solar Trigeneration^sm Energy Systems Provide All of the Cooling, Heating & Power, for Any Size Building, with only the Energy of the Sun. Solar Trigeneration^sm Energy Systems Provide Simultaneous  Cooling, Heating & Power whether it is 12 Noon, or 12 Midnight,  and can do so, WITHOUT Connection to the electric grid!

The Diagram Below Shows How Our Solar Trigeneration^sm Energy System Works, 
for Heating and Cooling a Building (next to the Solar Thermal Collectors, are the PV Panels, that generate the Electricity).

Our Solar Trigeneration^sm Energy System
provides "Cooling, Heating & Power" for your business,
or home with the free energy of the sun!

What is Net Energy Metering?

Net energy metering is used to measure a customer's total electric consumption against that customer's total on-site electric generation.  When a customer's onsite generation of power exceeds the amount that they use, the customer's solar energy system (or other renewable energy system) exports the extra electricity to the grid.  When the power requirements of the customer exceeds their onsite generation of power, the customer imports the electricity they need from electric grid. The customer pays the electric company for any extra power they use over the amount they generate - OR -  the customer receives a credit or refund from the electric company if they exported more power to the grid, than what they consumed.  

Renewable Energy Is Necessary for Net Zero Energy Buildings

Much focus is placed on energy efficiency as the most cost-effective way to reduce energy use in commercial buildings. However, consumption can be reduced only so much. There is a point at which the cost of adding efficiency measures is higher than that of using renewable energy such as thin film photovoltaics and other solar energy systems. 

Aggressive energy efficiency strategies can reduce a building's energy consumption by 50% to 70%. Renewable energy technologies must be used to reach the goal of a net-zero energy building (NZEB).

Supply-Side Technologies

Various supply-side renewable energy technologies are available for Net Zero Energy Buildings. Supply-side technologies, often called energy producers, collect natural energy and transform it into a useful form. Examples of these technologies include PV, solar hot water, wind, hydroelectric, and biofuels.

Ranking of Energy Options

All renewable sources are favorable over conventional energy sources such as coal and natural gas; however, the U.S. Department of Energy recommends the following ranking for these options (the lower numbers are preferable):

This hierarchy is weighted toward renewable technologies within the building footprint and site. Rooftop PV and solar water heating are the most applicable supply-side technologies for Net Zero Energy Buildings. Other supply-side technologies such as parking lot-based wind or solar energy systems may be available.

The goal in developing the ranking was to encourage technologies that:

• Minimize overall environmental impact by encouraging energy-efficient building designs and reducing transportation and conversion losses

• Will be available over the lifetime of the building

• Are widely available and have high replication potential for future Net Zero Energy Buildings.

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Solar Trigeneration^sm
www.SolarTrigeneration.com

Now, Your Business Can Have Our Solar Trigeneration™ 
Energy System, installed for No Up-Front Costs!

Through an affiliated partner company, we are now installing our Solar Trigeneration™ Energy Systems, for qualified commercial businesses, nationwide, with Zero up-front costs.

Some customers may even see a decrease in their energy expenses by as much as 10% to 20% with our Zero up-front cost Solar Trigeneration™ Energy System!

To qualify for our no up-front cost Solar Trigeneration Energy Systems, businesses must:

• Have a good credit rating

• Agree to buy all of the energy generated from the Solar Trigeneration™ Energy System through a 20 year Power Purchase Agreement

• Other conditions may apply, depending on location, state or utility company you are presently buying power from.

We expect ALL of our customers will be very happy knowing that the clean, green, renewable power they are using is: 

• More reliable than the electricity from the power company.

• Saving the environment by reducing Greenhouse Gas Emissions and helping reverse Climate Change and Global Warming.

• Generated from their own reliable Solar Power System on their roofs.

• Saving Money!  At today's published electric rates at Southern California Edison, TXU, Reliant and Centerpoint, most of our customers will also enjoy a SAVINGS on their present electric bills by as much as 10% from what they are now paying for their electricity from the electric utility.

• Under warranty.

• At the end of the Power Purchase Agreement, the Solar Trigeneration™ Energy System is then offered for sale to our customers, for $1.00.  And then their energy savings really start to add up as the power and electricity generated from their Solar Trigeneration™ Energy System is free!

Our "Solar Trigeneration^sm" Power and Energy Systems
Generate Carbon Free Energy and Pollution Free Power
Which is Sustainable, Clean, Renewable and Affordable

Solar Energy Systems provides cooler, cleaner, greener power and energy project development services.  Our Solar Energy Systems are an environmentally-friendly and economically-superior choice to expensive natural gas and electricity. Additionally, our renewable energy technologies generate "green tags" or a Renewable Energy Credit.  

We provide Solar Power and Energy systems that we refer to as "EcoGeneration" solutions that produce cooler, cleaner, greener power and energy for our customers and our environment. Unlike most companies, we are equipment supplier/vendor neutral. This means we help our clients select the best equipment for their specific application. This approach provides our customers with superior performance, decreased operating expenses and increased return on investment. 

Our company provides turn-key project solutions that include all or part of the following: 

• Engineering and Economic Feasibility Studies 

• Project Design, Engineering & Permitting

• Project Construction

• Project Funding & Financing Options

• Shared/Guaranteed Savings program with no capital requirements. 

• Project Commissioning 

• Operations & Maintenance 

• Green Tag/Renewable Energy Credit Application, and Marketing

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Power Purchase Agreement
www.PowerPurchaseAgreement.com

What is a Power Purchase Agreement?

A Power Purchase Agreement is a legal agreement wherein our clients agree to buy either the power (electricity) or the power and energy (hot water, steam and/or chilled water for air-conditioning) - or both - directly from us, for a term of 10 to 20 years, where we have installed, own and operate our solar energy systems. 

In nearly every case, once we have installed our solar energy systems at our client's facility, we can immediately reduce our (commercial) client's electricity expenses by 10% over what they were paying for their power electricity from their electric utility.

The right Power Purchase Agreement, solar cogeneration or solar trigeneration energy solution, may save your company hundreds of thousands, and possibly millions of dollars over the term of the agreement.

Simultaneously, having the wrong or poorly drafted PPA can cost your company thousands or millions of dollars.  You wouldn't consult a brain surgeon to treat your child's broken bone!  Selecting the wrong attorneys, law firm or team to promulgate or re-negotiate your Power Purchase Agreement can leave you "powerless" and penniless - and still requiring the skills and expertise of competent and qualified professionals to resolve the situation.

Because a Power Purchase Agreement is at the "heart" and underlying foundation of our projects, we can help your business with the selection and oversight of PPA's. 

We can help your city or community create a Municipal Utility District or Public Utility District that may then qualify for our very competitively priced energy and electricity rates. Now is the time for cities, municipal and governmental clients to consider having our company install one of our renewable power and energy systems that will generate "clean" power and energy, lower costs, and avoid the coming electricity shortages and grid congestion problems!  

Products and services provided by us include the following power and energy project development services: 

• Project Engineering Feasibility & Economic Analysis Studies  

• Engineering, Procurement and Construction

• Environmental Engineering & Permitting 

• Project Funding & Financing Options; including Equity Investment, Debt Financing, Lease and Municipal Lease

• Shared/Guaranteed Savings Program with No Capital Investment from Qualified Clients 

• Project Commissioning 

• 3rd Party Ownership and Project Development

• Long-term Service Agreements

• Operations & Maintenance 

• Green Tag (Renewable Energy Credit, Carbon Dioxide Credits, Emission Reduction Credits) Brokerage Services; Application and Permitting

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Net Zero Energy Buildings^sm
www.NetZeroEnergyBuildings.com

The Audubon Nature Center Installs Solar Trigeneration  System
Making this one of the World's First "Net Zero Energy Buildings"
at Their New Facility in Los Angeles, California

GRID-FREE SOLAR ENERGY SYSTEM....
NO CONNECTION TO THE ELECTRIC UTILITY!

The Solar Trigeneration  Provides All of their Facility's (5000 sq.ft.)
Cooling, Heating and Power Requirements - at 12 noon or 12 midnite,
WITHOUT ANY CONNECTION to the Electric Utility
with our Solar Trigeneration Energy System!  

The Sun Powers the Audubon Nature Center's Solar Trigeneration  
System at Debs Park in Los Angeles. The Audubon Nature Center's 
building is one of the world's first "Net Zero Energy Buildings." 
The Solar Trigeneration System Consists of a 10 Ton "Solar 
Absorption Cooling" System Matched with a Solar Electric 
Power System and a Solar Water Heating System

By:  Monty Goodell, MBA
www.SolarTrigeneration.com
Los Angeles, California

There is now a better, more efficient, “pollution free power” and "carbon free energy" solution for cooling, heating and powering homes and commercial buildings where solar energy is available. It's called Solar Trigeneration.

Solar Trigeneration is defined as the simultaneous generation of cooling, heating and power with only the free solar energy from the sun providing the "fuel". 

Solar Trigeneration is now a reality at the Audubon Center at Debs Park several miles from downtown Los Angeles and is one of the world's first "Net Zero Energy Buildings." Net Zero Energy Buildings." Net Zero Energy Buildings."

The Audubon Nature Center is totally powered by the sun’s energy and our Solar Trigeneration energy system!

The 5,300 square foot building operates entirely “grid-free” and without any electric connections to the electric grid, or natural gas connections – a truly sustainable power and energy solution. 

Best of all, the Audubon Center doesn’t rely on the over-burdened electric grid or even natural gas.  Therefore, the Audubon Nature Center NEVER receives an electric bill or natural gas bill.... ever!

The Audubon Nature Center's 5,000 square foot office and conference facility is powered by a Solar Trigeneration system that features a 25-kilowatt solar electric power system where the energy is stored in a bank of batteries. The Center is cooled by a 10-ton solar absorption cooling system powered by an array of very efficient solar heat pipe vacuum tube thermal collectors.  The collectors heat the water to temperatures of 200+ degree F stored in a 1,200 gallon insulated tank, another type of inexpensive battery. The Solar Trigeneration system at the Audubon not only provides the air-conditioning in the summer but also heats the building in the winter, and provides the hot water for the kitchen and bathrooms. 

Absorption chillers, and cooling with solar energy with an absorption chiller are not new technologies.  In fact, absorption chiller technology is over 70 years old.  The first refrigerators were powered by propane gas to run the absorption chillers that used ammonia as a refrigerant.  Electricity and the electric compression chiller gained popularity only because of the convenient “plug and play” appliance and relatively cheap electric rates.  Electricity is no longer economically, or environmentally “cheap.”

History of Cogeneration and Trigeneration

Few people realize that the world's first commercial power plant, designed and built by Thomas Edison, was a cogeneration power plant that was first opened on Pearl Street, in Lower Manhattan, New York.  That was in 1882!  Edison not only generated, and sold electricity in the several blocks surrounding his "Pearl Street Station" but he also sold the hot water that was also generated from the cogeneration plant. The fuel Edison used for generating the electricity and hot water (cogeneration) came from "pulverized coal." The Pearl Street Station provided 110 volts of "direct current" power to 59 customers in lower Manhattan, around his Pearl Street laboratory. 

Cogeneration is the simultaneous production of heat and power. 

Trigeneration is the simultaneous production of cooling, heating and power.

Our company, in partnership with the Renewable Energy Institute and our affiliated partners, have perfected "Solar Cogeneration" and "Solar Trigeneration" which are the "heart" of our Net Zero Energy Buildings.

Unlike traditional cogeneration and trigeneration power plants that are fueled by natural gas - and Thomas Edison's cogeneration plant, which was fueled with pulverized coal, our Solar Cogeneration and Solar Trigeneration energy systems are fueled with the energy of the sun!  And, while natural gas is a "cleaner" fuel, it still has its problems in that it is a limited resource and generates greenhouse gas emissions.  Natural gas also have had extreme price swings and has a history of price volatility.  Natural gas prices have gone from a high of $17.00/mmbtu to a recent low of under $3.00/mmbtu.  

Regarding pulverized coal, yes, it's cheap in terms of the cost of generating electricity, but too many people forget about the "externalities" of pulverized coal that is not reflected in the "cheap" costs of generating electricity from pulverized coal.  These costs not accounted for are the huge environmental cost relating to the use of pulverized coal.  Pound for pound, pulverized coal and coal fired power plants generate more greenhouse gas emissions than any other fossil fuel.  There are also the costs related to the health and safety issues of the miners that mine the coal.  And, the costs to the environment in terms of the ever-increasing amounts of mercury that are "dumped" into the environment from coal fired power plants, is also not reflected in the "cheap" price of generating power from pulverized coal.

Unlike the problems inherently found with the use of fossil fuels, Solar Cogeneration and Solar Trigeneration have no such problems. 

And talk about "cheap" costs of generating power and energy, there is nothing cheaper than free!!!!  

The owners of the Audubon Nature Center never receive any monthly natural gas or electric bills!

And the owners of the Audubon Nature Center will never have to account for their greenhouse gas emissions, or comply with the ever-increasing regulations related to greenhouse gas emissions and the pending Cap and Trade laws..... thanks to our  Solar Trigeneration energy system!

Solar Trigeneration is an EcoGeneration solution.  EcoGeneration refers to a power and energy system that uses the “natural” energy or fuel that is available for a specific site or location. Such energy or fuel includes, solar, wind, BioMethane, geothermal, and ocean power, including ocean tidal and ocean thermal energy conversion. For example, in the desert areas of the Southwestern U.S. , there is an abundance of solar energy. Therefore, home-owners and business owners in this part of the country should seriously consider an EcoGeneration system (“ecogen system”) that optimizes the opportunities available through solar energy

Today, the cause of the summer peak electric demand, electric supply problems, and black-outs, are the result of the energy crisis in California, primarily attributed to the air conditioning load. Over 40 percent of the electricity generated every day goes is used for air conditioning.  At this time of year, the electric utilities are forced to turn on all of their power plants to generate the “peak” demands required by the customers, primarily for air-conditioning.  This means that all of the efficient power plants, the inefficient power plants, along with all of the “peaking” power plants have to run to generate the electricity needed. The high cost of meeting the peak demand is passed on to the consumers with rates of $.20+ per kWh during the summer months. For fixed income seniors living in desert communities, they are already forced to conserve on energy, food, water, and other necessities of life. 

Greater Demands on California’s Limited Electric Supply, Lack of New Electric Power Supplies, and This Summer’s Heat Wave are Compounding the Problem Leading to the “Perfect Electric Storm”

Many people will remember the movie “The Perfect Storm” from several years ago, when several storms came together in the northeastern part of the U.S. to produce a deadly and catastrophic “perfect” storm. Today, a different type of “perfect storm” is brewing in California. The storm that’s looming on the horizon in California is a “perfect electric storm” wherein the supply of electricity from the electric utility company’s power plants are unable to keep-up with the demand – meaning a black-out, or loss of electricity, like the black-outs from previous years, and like the northeastern black-out from 2003.

The most likely time of year for a black-out in California, unfortunately, is the summer, when air-conditioners are running at the maximum, and placing the maximum load on California’s electricity supply.  Should such a black-out occur in the desert areas of California, where daily high temperatures routinely reach 110 degrees and higher, and where a significant percentage of the population is comprised of retired and senior citizens, and should the black-out be prolonged, a number of deaths will be the likely outcome. People, and especially the elderly, simply cannot tolerate prolonged high temperatures

How Do We Prevent the “Perfect Electric Storm” from Occurring in California and Other Regions in the U.S.?

Another major concern is how do we prevent the “Perfect Electric Storm” from happening, like the Northeast Blackout several summers ago, especially for people living in the desert?  California ’s energy authorities are warning of a possible energy crisis during the hot summer months, due to the excessive and prolonged summer temperatures where demand increases by over 40 percent.  Compounding the problem is the rising demand for electricity due to population growth and the limited transmission capacity in some areas in the region.  According to the California Energy Commission, the State must build three natural gas-fired 500-megawatt peaking power plants, every year, just to keep up with the growing demands of electricity. Failure to keep up with demand means The problem is getting worse due to the population growth in the Inland Empire , Coachella Valley and Antelope Valley. The projected power gap for the coming summers remains bleak.

Governor Schwarzenegger’s “Million Solar Roofs” program and the passage of the 2005 Federal Energy Act will be the foundation to create a “Perfect Solar Storm” to trigger the Solar Economy throughout California. 

With the threat of California’s seniors and elderly dying from heat exhaustion due to power outages, black-outs, rolling black-outs and the rising costs of electricity and natural gas, combined with the continuing impact of global warming, the perfect solution is to create a Solar Revolution by cooling, heating and powering the desert with solar energy and technologies like Solar Cogeneration or Solar Trigeneration.

For more information about Solar Energy Systems, such as Solar Cogeneration or Solar Trigeneration, call/email the Renewable Energy Institute.

The Audubon Center's new Solar Trigeneration power and energy system
makes this building a "Net Zero Energy Building"

The Audubon's Roof showing the Solar Thermal Collectors, part of the 
Solar Trigeneration power and energy system

The heart of the Audubon's Solar Trigeneration power and energy system
provides "free heating, cooling and domestic hot water," a "net zero energy building."

The hot water from the Solar Thermal Collectors on the roof of the Audubon is pumped here for producing 
the building's heating, cooling and domestic hot water. Hot water is stored in the tank on the left for overnight.

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Absorption Chillers 
&
Adsorption Chillers

For Solar Trigeneration Applications

What are Absorption Chillers and How Does They Work?

Absorption chillers use heat instead of mechanical energy to provide cooling. A thermal compressor consists of an absorber, a generator, a pump, and a throttling device, and replaces the mechanical vapor compressor.

In the chiller, refrigerant vapor from the evaporator is absorbed by a solution mixture in the absorber. This solution is then pumped to the generator. There the refrigerant re-vaporizes using a waste steam heat source. The refrigerant-depleted solution then returns to the absorber via a throttling device. The two most common refrigerant/ absorbent mixtures used in absorption chillers are water/lithium bromide and ammonia/water.

Compared with mechanical chillers, absorption chillers have a low coefficient of performance (COP = chiller load/heat input). However, absorption chillers can substantially reduce operating costs because they are powered by low-grade waste heat. Vapor compression chillers, by contrast, must be motor- or engine-driven.

Low-pressure, steam-driven absorption chillers are available in capacities ranging from 100 to 1,500 tons. Absorption chillers come in two commercially available designs: single-effect and double-effect. Single-effect machines provide a thermal COP of 0.7 and require about 18 pounds of 15-pound-per-square-inch-gauge (psig) steam per ton-hour of cooling. Double-effect machines are about 40% more efficient, but require a higher grade of thermal input, using about 10 pounds of 100- to 150-psig steam per ton-hour.

In single-effect absorption chillers, all condensing heat cools and condenses in the condenser. From there it is released to the cooling water. A double-effect machine adopts a higher heat efficiency of condensation and divides the generator into a high-temperature and a low-temperature generator.

Actions You Can Take

Determine the cost-effectiveness of displacing a portion of your cooling load with a waste steam absorption chiller by taking the following steps:

• Conduct a plant survey to identify sources and availability of waste steam

• Determine cooling load requirements and the cost of meeting those requirements with existing mechanical chillers or new installations

• Obtain installed cost quotes for a waste steam absorption chiller

• Conduct a life cycle cost analysis to determine if the waste steam absorption chiller meets your company's cost-effectiveness criteria.

Absorption Chillers Refrigeration Cycle

The basic cooling cycle is the same for the absorption and electric chillers. Both systems use a low-temperature liquid refrigerant that absorbs heat from the water to be cooled and converts to a vapor phase (in the evaporator section). The refrigerant vapors are then compressed to a higher pressure (by a compressor or a generator), converted back into a liquid by rejecting heat to the external surroundings (in the condenser section), and then expanded to a low- pressure mixture of liquid and vapor (in the expander section) that goes back to the evaporator section and the cycle is repeated.

The basic difference between the electric chillers and absorption chillers is that an electric chiller uses an electric motor for operating a compressor used for raising the pressure of refrigerant vapors and absorption chillers use the heat for compressing refrigerant vapors to a high-pressure. The rejected heat from the power-generation equipment (e.g. turbines, microturbines, and engines) may be used with an absorption chiller to provide the cooling in a CHP system.

The basic absorption cycle employs two fluids, the absorbate or refrigerant, and the absorbent. The most commonly fluids are water as the refrigerant and lithium bromide as the absorbent. These fluids are separated and recombined in the absorption cycle. In the absorption cycle the low-pressure refrigerant vapor is absorbed into the absorbent releasing a large amount of heat. The liquid refrigerant/absorbent solution is pumped to a high-operating pressure generator using significantly less electricity than that for compressing the refrigerant for an electric chiller. Heat is added at the high-pressure generator from a gas burner, steam, hot water or hot gases. The added heat causes the refrigerant to desorb from the absorbent and vaporize. The vapors flow to a condenser, where heat is rejected and condense to a high-pressure liquid. The liquid is then throttled though an expansion valve to the lower pressure in the evaporator where it evaporates by absorbing heat and provides useful cooling. The remaining liquid absorbent, in the generator passes through a valve, where its pressure is reduced, and then is recombined with the low-pressure refrigerant vapors returning from the evaporator so the cycle can be repeated.

Absorption chillers are used to generate cold water (44°F) that is circulated to air handlers in the distribution system for air conditioning.

"Indirect-fired" absorption chillers use steam, hot water or hot gases steam from a boiler, turbine or engine generator, or fuel cell as their primary power input. Theses chillers can be well suited for integration into a CHP system for buildings by utilizing the rejected heat from the electric generation process, thereby providing high operating efficiencies through use of otherwise wasted energy.

"Direct-fired" systems contain natural gas burners; rejected heat from these chillers can be used to regenerate desiccant dehumidifiers or provide hot water.

Commercially, absorption chillers can be single-effect or multiple-effect. The above schematic refers to a single-effect absorption chiller. Multiple-effect absorption chillers are more efficient and discussed below.

Multiple-Effect Absorption Chillers

In single-effect absorption chillers, the heat released during the chemical process of absorbing refrigerant vapor into the liquid stream, rich in absorbent, is rejected to the environment. In a multiple-effect absorption chiller, some of this energy is used as the driving force to generate more refrigerant vapor. The more vapor generated per unit of heat or fuel input, the greater the cooling capacity and the higher the overall operating efficiency.

Double-effect absorption chillers uses two generators paired with a single condenser, absorber, and evaporator. It requires a higher temperature heat input to operate and therefore they are limited in the type of electrical generation equipment they can be paired with when used in a CHP System.

Triple-effect absorption chillers can achieve even higher efficiencies than the double-effect chillers. These absorption chillers require still higher elevated operating temperatures that can limit choices in materials and refrigerant/absorbent pairs. Triple-effect chillers are under development by manufacturers working in cooperation with the U.S. Department of Energy.

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What is Polycrystalline Silicon?

Polycrystalline silicon, also referred to as "semicrystalline silicon," "polysilicon," "poly-Si," or just "poly," is a material consisting of small silicon crystals. Polycrystalline silicon cells are recognized by their visible grain known as the “metal flake effect.”

Semiconductor grade as well as "solar grade" polycrystalline silicon is converted to "single crystal" silicon - meaning that the randomly associated crystallites of silicon in "polycrystalline silicon" are converted to a large "single" crystal.  Single crystal silicon is used to manufacture most Si-based microelectronic devices. Polycrystalline silicon can be as high in purity as 99.9999%.

What are Thin Film Photovoltaics?

Without a doubt, the most exciting technology in the solar power industry is "Thin Film Photovoltaics."  Thin Film Photovoltaics technology represents the next big thing in renewable energy and solar power as it integrates nanotechnologies into the production of solar photovoltaics. 

According to the Department of Energy, the recent technological advances in thin film photovoltaics make this a very exciting time to be in the solar energy industry.  These advances have led to many new developments in the components and manufacturing of thin film photovoltaics. This has made thin film photovoltaics cheaper to manufacture as they are also now easier to install since they are extremely versatile, flexible, bendable, and much lighter.

Thin film photovoltaics  have led many to believe that as much as 50% of our nation's future power will be generated by "power buildings" that integrate "building integrated photovoltaics" or "BIPV" into the building's skin or exterior surfaces, that convert sunlight into "pollution free power" for use in the building.  This also designates these buildings (and homes) as "Net Zero Energy Buildings" and make the option for going grid-free, or not connecting to the grid, a real possibility.

According to the Department of Energy, the market potential for printed electronics will grow into a $47 billion market by 2018.  Thin film photovoltaics represents a significant portion of this market - and based on this heavily researched solar technology, thin film photovoltaics now represents a $20 billion/year industry in the U.S.

The solar PV panels produced under the thin film photovoltaics umbrella have the potential to produce power significantly cheaper power than today’s typical silicon-based PV panels.  The panels are usually made in the form of a monolithic piece of glass, upon which various thin films are deposited, although a number of firms are working on depositing the materials on a substrate, such as stainless steel or plastic.

Types of Thin Film Photovoltaics – there are primarily three types of thin film photovoltaics and include:

1. Amorphous Silicon

2. Cadmium Telluride

3. Copper Indium Gallium Diselenide

Amorphous Silicon had the largest share of the thin film photovoltaics market through 2006. It has been researched for the longest period of time, may be the best understood material of the three and has been commercial for the longest. 

Cadmium Telluride, a very toxic chemical and has the remaining share and is growing. 

• Lower cost of production of the 

• Lower production facility cost per watt - CapEx

• Uses as little as 1/500 of the amount used in standard silicon cells

• Lower energy payback – amount of time until the product produces more energy than was utilized in its manufacture.

• Produces more power/watt

• Superior performance in hot and cloudy climates

• Integrates seemlessly in homes and buildings – see Building Integrated Photovoltaics 

• Produces the lowest cost power

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Photo courtesy of Alaska Image Library. U.S. Fish and Wildlife Service
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How we make and distribute electricity is changing! 

The electric power generation, transmission and distribution system (the electric "grid") is changing and evolving from the electric grid of the 19th and 20th centuries, which was inefficient, highly-polluting, very expensive and “dumb.”  

The "old" way of generating and distributing energy resembles this slide:

The carbon clock tracks total carbon dioxide emissions in metric tons since 1750.

Since 1750, humans have emitted over 5 trillion pounds of carbon dioxide into the atmosphere. Roughly half of this has ended up in the oceans where it is beginning to damage the coral reefs. The other half is still in the atmosphere and causing global warming. Each pound of CO2 takes up as much space as a 500 pound person.

The formula (which should be good for a year or two) is:
C(t) = 2.58 ×1012 + 1240×t, where t is seconds since the start of 2007.

C is tonnes (metric tons) of carbon dioxide emissions.
2205 x C gives pounds of carbon dioxide emissions.

That comes to over 43 billion tons/year or over 86 trillion pounds/year.

Carbon dioxide (2) = 1 carbon atom with 2 oxygen atoms.
Carbon has relative weight 12 and Oxygen 16.
So it takes only 12 pounds of carbon to make 12+16+16 = 44 pounds of CO2. 

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Zero Emission Power
www.ZeroEmissionPower.com

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