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Energies 2019, 12, 457 Heat Pump Components 7 of 35 References Jiang et al. [25] Type of Study Table 2. Cont. Unique System Features - Reciprocating pump - Reciprocating compressor Nature of Study Major Findings Theoretical Experimental √ Energy √ Exergy Compressor - Integrating an HX increased CDP by 0.2–0.4 MPa - CDP was always higher than the critical pressure of CO2 (7.377 MPa) - The higher the outlet water temperature is, the higher the discharge pressure temperature and pressure are - COPmax=4.6atηc=1 - COPmax = 3.5 at ηc = 0.75 - Optimum discharge pressure was 85 bar - Overall performance reduced by 30% for compressor efficiency decrease from 1.0 to 0.75 - Effect of internal superheating on the system COP was minimal - Optimized oil-injection reduced refrigerant leakage loss in compression process - Scroll compressor performed marginally better compared to the rotary compressor with an average COP ratio of 1.05 Rozhentsv and √ Wang [26] - Semi-hermetic compressor - Recuperative HX - Scroll compressor - Oil-injection to compression chamber √ Hiwata et al. [27] √ √PDF Image | Recent Advances in Transcritical CO2 (R744) Heat Pump System
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