Residential CO2 Heat Pump System for Combined

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Residential CO2 Heat Pump System for Combined ( residential-co2-heat-pump-system-combined )

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Component/Mode Compressor Evaporator Tripartite Gas Cooler Combined mode DHW Gas Coolers Units DHW mode SH Gas Cooler Unit SH mode Parameter Suction pressure (-5oC) Suction temperature Discharge pressure CO2 mass flow rate Evaporation temperature LMTD SH – Water temperatures SH – Heating capacity SH – Temperature approach DHW – Water temperatures DHW – Heating capacity DHW – Temperature approach Water temperatures Heating capacity Temperature approach Water temperatures Heating capacity Temperature approach Value 3.046 MPa 0oC 8.5 to 9.0 MPa ~1.40 kg/min -5oC ~5 K 35/30oC ~3.0 kW < 0.2 K 5/60oC ~3.5 kW < 3 K 5/60oC ~7.0 kW < 3 K 35/30oC ~5.5 kW < 0.2 K 4 – Test Rig Design and Experimental Methods ♦ A hermetic two-stage rolling piston compressor ♦ A tripartite counterflow tube-in-tube gas cooler for: o Preheating of hot water (DHW preheating gas cooler unit) o Low-temperature space heating (SH gas cooler unit) o Reheating of hot water (DHW reheating gas cooler unit) ♦ A counterflow tube-in-tube suction gas heat exchanger ♦ A cross-flow subcooler ♦ Manual throttling valves (back-pressure valve and needle valve) ♦ A low-pressure receiver (LPR) ♦ An oil return system including filter ♦ Control valves, closing valves and safety valves (8 and 12 MPa) The design conditions for the heat pump unit are presented in Table 4.1. Table 4.1 Design conditions for the residential CO2 heat pump unit. 69

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Residential CO2 Heat Pump System for Combined

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