Storing excess daytime solar energy to heat greenhouse at night!

Russell has a unique and effective system for heating his greenhouse. On sunny days, the system takes excess heat from the peak of the greenhouse that would normally just be vented outside and uses a water to air heat exchanger to transfer this this heat to a large water tank. The heat stored in the water tank provides heat to the greenhouse on cold nights and cold cloudy days. The same water to air heat exchanger that stores heat is used to distribute heat to the greenhouse.

In Russell's North Carolina climate, the system is doing quite well and is able to weather cold and cloudy days on stored heat.

The system is described in detail in a 12 page pdf (download below).

Thanks very much to Russell for providing this description!