Binary Cycle Geothermal Heat Pumps GHPs

2 Binary Cycle Geothermal Heat Pumps (GHPs) 

Post-Oil Energy Technology After the Age of Fossil Fuels 

Geothermal heat pump (GHP) and solar hot water system combined to continuously meet the electricity needs of a home. 

The same holds true for the Rankine cycle refrigerant pump (P2), operating between the solar hot water tank and the pond (swamp). Because the condenser temperature (swamp temperature) is more or less constant, one need not detect the AT and can just look at the boiler (solar water tank temperature—T2) and keep P2 running whenever the temperature T2 is above 60°C (140°F). The temperature controller TC-2, brings P2 to full speed as the T2 temperature reaches, say, 70°C (160°F). 

If one wants to maximize the efficiency of the system, one can use temperature difference control, but it costs more and is usually not justified for a private home. If such controls are used, the measured variable would be the AT between the boiler and condenser waters, and one would prepare a three-dimensional plot, where the coordinates are AT, refrigerant flow, and net electricity production. The net electricity produced is the difference 

---