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Energies 2019, 12, 457 Heat Pump Components 9 of 35 References Agrawal et al. [31] Yamaguchi et al. [21] Kim et al. [32] Xing et al. [29] Tao et al. [33] Type of Study Theoretical Experimental √ √ √ √√ Table 2. Cont. Unique System Features Nature of Study Energy Exergy - Non-adiabatic capillary tube - Homogeneous flow model √ - - Employed finite difference method - Twin-tube type HX √ - IHX Major Findings - Heat transfer was prominent in single phase region Evaporating cooling capacity and COP were higher when the HX was placed in the supercritical region - Enhanced the COP up to 3.5 - Improved heat transfer rate in the gas cooler and evaporator Internal Heat Exchanger √ - Counter-flow √ - multi-tube HX - Geothermal CO2 HP - Two-stage CO2 HP - - Two ejectors √ - IHX - 2% to 6% increase in COP in cooling mode compared to the system without IHX COPmax = 4.3 at evaporating temperature of 0 ◦ C 30% increase in the heating COP √ - Three-row staggered wavy fin-and-tube HX - HXs had a single flow path arrangement - Double-tube IHX √ √ - The IHX could keep the throttling loss down to 5% - The throttling loss caused about 20% COP loss - The cooling effect of the gas cooler directly influenced the throttling loss. The better the cooling effect, the smaller the throttling loss.PDF Image | Recent Advances in Transcritical CO2 (R744) Heat Pump System
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