Solar Greenhouse

 


Visible light from the sun turns into heat when it strikes the dark interior wall of the greenhouse. This heated air tends to rise and concentrate near the top of the greenhouse. It then pushes open the top plastic flap and enters the living quarters. The raised pressure of air in the house causes cold air near the floor to push the bottom flap open into the greenhouse.

 

The solar greenhouse will continue will continue to bring heat into the house like this until sunlight is blocked by clouds or evening approaches. After a short period of time without sunlight, the convection currents inside the greenhouse reverse. Air cooled by the glazing will tend to drop and the hot air from the living space will rise and try to enter the opening at the top of the greenhouse. Without these one way flaps all the heat gained during the day would soon be lost by this cooling process, but with these flaps daytime heat is trapped inside the house. The flaps turn this ordinary greenhouse into a solar greenhouse.

 

OK! Now you understand how a solar greenhouse works. Do you think you can build one. The larger you make it the better it works, but the more it will cost. My solar greenhouse is 10 feet high and 20 feet wide. It reaches a temperature of 160 F. in mid winter when the outside temperature of 0 F. You might not want to build one like this large, but you should be able to construct one about 2 feet high as an experimental greenhouse.









               


                           

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