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Electrical Generation - PV & Thermal Solar



Photovoltaics



How a PV Cell Works

 
Power Tower



Dish Sterling



Trough

Electrical Generation

The generation of electricity from solar energy can be achieved through two major technology alternatives. One uses the light from the sun to generate electricity directly, (photovoltaic technologies), and the other uses the heat from the sun to increase the temperature of a working fluid which-in turn can be used to generate electricity, (solar thermal technologies). Each of these major alternatives can, in turn, be subdivided into variants of the major technology. Photovoltaic technologies fall into crystalline, multi-crystalline, thin-film or concentrator variants while the solar thermal technologies fall into trough, power tower, dish engine and thermal electric variants.

Photovoltaics

Generally speaking, How a PV Cell Works describes the use of a semiconductor material that is exposed to sunlight. The energy of the incident light displaces electrons from their normal atomic orbits and an electrode grid structure on the surface of the semiconductor collects these electrons and makes them available for use in an external circuit. This is very similar to the way that the chemical reaction and the electrodes in a dry battery cell make electrons available for external use.

The terms crystalline, thin film and concentrator describe the manner in which the semi-conducting material is processed and optimized as a photovoltaic cell. Crystalline cells are fabricated from ingots of the semiconductor material, usually silicon, that are cut into relatively thin slices, processed to optimize the electron collection efficiency and laminated into a protective enclosure. Thin film cells are extremely thin layers of semi-conducting material that are evaporated onto a substrate, and concentrating cells use a plastic lens to concentrate sunlight from a large area onto a much smaller area of crystalline semi-conducting material. All types have their merits and problems and are described in detail in the referenced locations.

Download the Arizona Consumer's Guide - this booklet is designed to guide you through the process of buying a solar electric system.  This document is somewhat out of date (2000) and does not mention some newer information. NOTE: You will need Adobe's Acrobat Reader to open, view, and print this document.  Acrobat is freely available and can be downloaded from Adobe's Web site. Arizona Consumer's Guide (PDF Format)

Visit the National Geographic's web site and take the: PV Quiz


Solar Thermal

Both the trough and power tower solar thermal technologies use mirrors to concentrate the heat from the sun onto a vessel containing a heat transfer fluid. The fluid is then pumped into a steam generator where the heat is transferred to water turn it into steam. The steam can then be used to spin a conventional steam turbine connected to a generator to make electricity. As you can see, the size of the concentrating systems makes them impractical for homes.

In the case of the trough, the mirror is a long parabola with a steel tube containing the heat transfer fluid running along the focal axis of the mirror. The axis of the mirror is usually aligned in a North-South direction and the mirror is rotated from East to West as the day progresses so that the energy from the sun is continually focused onto the steel tube. Rows of mirror/tube assemblies are used to form large multi-acre solar fields from which the heated transfer fluid is collected and used in the generation of steam.

The power tower system is a little different in that all of the transfer fluid heating is achieved in a heat receiver on the top of a tower located in the center of a field of computer controlled mirrors, or heliostats. Cold fluid is pumped up to the top of the tower, the heliostats focus the sun's energy onto the receiver and heat the fluid which is subsequently returned to the ground and used in a steam generator in the same way as the heat transfer fluid in the trough system.

Dish/engine systems are somewhat different in that the heat from the sun is used to heat a working fluid within a heat engine. The rotating shaft of the engine is connected to a generator, which produces electricity without the need to go through a steam generation process. The engine is located at the focal point of a parabolic dish mirror, which is made to track the sun across the sky throughout the day.


Good Resources:

 

Environmental Benefits of Renewable Energy

 OR    

Renewable energy—wind, solar, geothermal, hydroelectric, and biomass—provides substantial benefits for our climate, our health, and our economy. Each source of renewable energy has unique benefits and costs; this page explores the many benefits associated with these energy technologies.

Solar, wind, and hydroelectric systems generate electricity with no associated air pollution emissions. In comparison, coal and natural gas plants have air and water pollution that is linked to breathing problems, neurological damage, heart attacks, and cancer.

Environmental damage affects everyone, but the costs and benefits of reducing environmental damage are not well matched or shared.  Air and water pollution can travel great distances and affect areas well removed from the sources of pollution.  There is a lot of evidence that the global environment is being degraded by the net effect of many activities that produce pollution either directly or indirectly.  The production of energy is a major contributor, especially the burning of fossil fuels.  Pollution of the environment can be reduced by adopting renewable energy, but there are costs involved. 

Some interesting links:

Solar Architecture in Ancient Greece

According to Socrates, the ideal home should be cool in summer and warm in winter. But Socrates' ideal was not easy to accomplish 2,500 years ago in ancient Greece. The Greeks had no artificial means of cooling their homes during the scorching summers; nor were their heating systems, mostly portable charcoal-burning braziers, adequate to keep them warm in winter.

Modern excavations of many Classical Greek cities show that solar architecture flourished throughout the area. Individual homes were oriented toward the southern horizon, and entire cities were planned to allow their citizens equal access to the winter sun. A solar-oriented home allowed its inhabitants to depend less on charcoal - conserving fuel and saving money.

Some Barriers to Implementation of PV Systems

Building Permits:

Scottsdale requires a structural engineer report on the specific structure for residential PV and DHW. This costs a minimum of $500, usually higher. However, this has identified some potentially dangerous residences.

The Cities of Gilbert and Mesa do not require any permit for residential systems that do not involve changes to the main service electrical panel. The City of Mesa extends this to commercial systems. In Mesa the exemption includes the parking canopy construction as “just another mounting structure for the solar". A zoning review may be required in Mesa unless there are existing canopies and the solar canopy fits in with the others. However, if a building permit is needed in Mesa, it generally takes ‘only’ 20 working days, but Mesa is on a 4-day/week schedule so this means 5 weeks.

Plan review and permits generally add about 2% to the cost of a PV system.

The Cities of Gilbert and Mesa have generally accepted roof layout requirements intended to improve fire fighter safety in the event a house fire requires roof ventilation or other fire fighter roof access. Since building permits are not required, there is no formal check on this unless complaints are filed. There are many residential PV systems that do not conform to this requirement. 

A recent project to install a covered parking canopy with a PV system on residential property in the City of Phoenix was a permit problem. In Phoenix simple PV systems can have a building permit issued ‘over the counter’ the same day with a set of properly designed plans. Not so simple with a large PV system on a separate parking canopy, located on a hillside lot. First of all, the Residential counter in the permit office takes a quick look at the plans and says “We are not staffed to review a parking structure, you need to go to the Commercial counter (another wait), then the Commercial counter looks up the property and states “This is residential, we cannot handle residential, go back to the Residential counter”. After insisting that the supervisors of these counters discuss this, they decide that two separate permits (structure and PV) are needed. The structure permit starts with a Site Plan that must include the square footages of the lot, hillside designated area, under roof area, disturbed areas, etc., all based on the original building permit for the lot many years ago. If the present owner of the lot does not have this information, one must wait for the City of Phoenix to search the archives. This took weeks and several meetings with zoning. Only after a building permit for the parking structure has been issued can a separate permit for the PV system be issued, and not over the counter. The whole procedure can take three months.