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Thermal Collectors and Thermal Solar Power Systems

by Walter Hull

We use the words thermal solar power to describe any system designed to convert solar radiation into thermal energy. It is one of the major players in the solar power market and has huge untapped potentials.

The uses for thermal solar power are widespread and varied. Just think of any process which could utilize heat. This could range from something simple such as hot water heating, to more sophisticated designs involve stirling engines or industrial grade steam.

For small scale applications, thermal solar power is used in the home. The heat is used to maintain hot water tanks, or is stored in the floors or walls of our buildings.

There are other good uses for thermal solar power which we expect to increase in years to come. One is pebble bed heat exchangers, which act as a thermal storage bank for converted heat. This gives us some system capacity and operating flexibility.

Applications for pebble bed heat exchangers include radiant heating in and around our homes. They can be integrated into greenhouses, saunas, or even in your family rooms. Pebble bed heat exchangers are made from natural materials, and can be an attractive feature in any home.

The typical operating temperatures for a thermal solar power system will range from 120F to 180F. We have technologies to boost these temperatures from 200F to 350F. Industrial grade technologies can achieve temperatures in excess of 700F. Most of us with fall in the hundred degree category, but for the tinkerers, mechanics, and home enthusiasts we may want to push 300 degrees for our special applications.

The solar collector is the most important component to a thermal solar power installation. A few different types include flat plate absorbers, evacuated tube absorbers, and parabolic trough concentrators. Their main purpose is to absorb solar radiation and generate heat for the system. With a good sized solar collector system, significant heat can be generated and distributed to multiple locations.

The lifeblood of the thermal solar power design is the circulating fluid. The circulating fluid is heated in the solar collector, and then pumped to all the system users. This fluid is typically oil, glycol, or water which is matched to the system temperatures and equipment in use.

Thermal solar power is a good first step for anyone getting involved with solar energy, and especially those with good amounts of Sun. The simplicity, potential savings, and environmental benefits make them an easy decision for those retrofitting or building a new home.

We believe thermal solar power to be a steadily growing market into the future, due to a growing awareness of energy conservation and reverting back to our natural ways. Thermal solar power is one good way to do this. The Sun is free, and we receive its energy each and every day. Solar hot water, home heating, and pebble bed heat transfer systems are simple to incorporate and easy to use. We believe their popularity will gain in years to come.

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