There is a category of solar power designs which generate heat directly from the Sun. They are called thermal solar power systems, and are a reliable and inexpensive way to make your life more self sustainable for years to come.

Thermal solar power can be used in as many ways as you can think. Designs exist from heating up your hot water tanks, to industrial steam generation and everything in between. Many of these systems are attractive because of their low cost and simplicity.

For small scale users like ourselves, thermal solar power can be integrated into our homes. The most practical applications are for hot water and home heating, and there are a variety of designs in use. Equally as important is that thermal solar power systems are affordable and easy to use.

Pebble bed heat exchangers are another application for thermal solar power. They are like the thermodynamic equivalent of a water tank. They give us a nice reservoir with which to store and distribute excess energy.

Pebble bed heat exchangers can be used in a variety of ways. They can be wall mounted units, or embedded in the floor. They can provide the heat source for everything from a family room, to a workshop, greenhouse, or dry sauna installation. They have good aesthetic qualities, being composed of natural materials, and can be incorporated in an attractive way into 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.

Thermal power systems are typically less expensive than solar power electricity, and can create household hot water and heat reliably. With the addition of pebble bed storage and higher operating temperatures, then the amount of potential uses suddenly becomes many. With the markets of sustainability re-growing their roots we expect to see a variety of new designs and installations in years to come.

Walter Hull is a mechanical engineer with expertise in solar energy power systems. For a short time you can get his free guide to solar energy from your own land.

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