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Solar-assisted CO₂ heat pump achieves 18.7% COP increase as irradiance rises
A research team in Italy has investigated the performance of a direct-expansion, dual-source heat pump that uses air and solar energy as heat sources and CO₂ as the refrigerant.
Summary
A research team in Italy has investigated the performance of a direct-expansion, dual-source heat pump that uses air and solar energy as heat sources and CO₂ as the refrigerant. The researchers aimed to identify optimal operating conditions and develop advanced control strategies. “An experimental campaign was carried out under real-field conditions on a 10 kW prototype, considering both Air-Mode and Sun-Mode operation for domestic hot water production and producing a total of 307 tests,” the researchers said.
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