Combined solar and underground heat conversion equipment - has three water flow circuits for underground, solar and intermediate heat exchangers

摘要

The arrangement for using the heat from the sun and also heat from underground employs three water flow circuits between a solar heat collector system above ground and a storage tank below ground, the water conveying tubes passing through a shaft between them. The first circuit uses the underground collection system and the solar collector. The second circuit uses the heat from the sun employing a heat exchanger as well as storing excess heat in the shaft and underground tank. The third circuit uses the heat stored in the underground tank during spring and autumn.