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Energies 2019, 12, 457 Heat Pump Components 5 of 35 References Qi et al. [19] Type of Study Table 2. Cont. Unique System Features - Tube-in-tube counter-flow Nature of Study Major Findings - COPmax = 3.7 at gas cooler outlet temperature of 20 ◦C Theoretical Experimental √ Energy Exergy Yu et al. [20] Yamaguchi et al. [21] √ √ √ gas cooler √ - Defrosting system - Optimal heat rejection pressure investigated - Tube-in-tube counter-flow HX - Water flowing in the √ annulus and CO2 flowing in the tube - Cross fin tube - Smooth plate - IHX √ - Static simulation model - Considered heat transfer performance - Optimal heat rejection pressure was largely influenced by the gas-cooler refrigerant outlet temperature - COP at the optimal heat rejection pressure decreased sharply when the gas cooler refrigerant outlet temperature increased from 25 ◦C to 45 ◦C - Considerable increase in the heat capacity flow rate of the CO2 near the pseudo-critical temperature - Local heat transfer rate increased along the HX length - High model accuracy (difference < 1.5%) - COPmax = 3.6 at a water inlet temperature of 8 ◦ C - The evaporator heat exchange rate decreased with rise in inlet water temperaturePDF Image | Recent Advances in Transcritical CO2 (R744) Heat Pump System
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