Solar-heated HTF coming into the storage tank
Andy Kerr
Solar-heated HTF coming into the storage tank (top gauge). The system pressure at the collectors ranges from 28 mm of mercury (vacuum) to 0 (ambient pressure) and depends on the insolation, ambient temperature, and temperature of the fluid returning from the heat exchanger. The gauge at the tank shows a higher pressure, as it includes head pressure (0.43 psi per vertical foot).
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