Passive Solar Power Works Without Other Influences

by Evans D. Smith

If you have ever been doing work in your yard and left the garden hose connected up but turned off when you took a break, water stayed in the hose while you stopped for a cold drink or a break. When you returned to work and opened the hose nozzle you found the water left in the hose had been warmed by the sun. You have just witnessed the results of passive solar power.

Harnessing passive solar power has been a quest for a few years and there are a few examples of success, but many require the use of other types of power as well . For instance, using passive solar electricity for heating water for a swimming pool has been available for several years, as water is removed from the pool, heated in a rubber bladder or plastic pipe and then returned to the pool. However, moving the water typically requires the use of a pump.

Operating the pump by hand may not be an attractive alternative, but using active solar power to charge batteries, and the battery power used to operate an electrical pump to move the water from the pool to the bladder or thru the pipes, can be an efficient way of using passive solar electricity, coupled with solar energy to save on your electric bill.

Slower Results From Passive Systems

If you want to experiment with passive solar electricity, take two equal size tubs of water and put them in the direct sunlight. Cover one tub with bubble wrap, usually used to protect items during shipping. The other tub should stay revealed. Wait about two hours and then test the temperature of the water and you will see the tub covered with bubble wrap is significantly hotter than the one left open.

Pool heating covers work much the same as the bubble wrap in targeting the suns electric generating capacities into the tub, while water left open will lose heat virtually as fast as it soaks up the heat. Using passive solar energy to heat the water works the same as heating and circulating air.

It’s a well-known fact that hot air rises and when passive solar electricity is used to heat air in an enclosed space, the hotter air will rise, causing the cooler air to flow to the bottom of the area. This will cause the air within the closed area to circulate allowing the space to heat from the benefit of the passive solar power.

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