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Energies 2019, 12, 457 Heat Pump Components 6 of 35 References Yun et al. [22] Elbel et al. [23] Brown et al. [24] Type of Study Theoretical Experimental √√ √√ √ Table 2. Cont. Unique System Features - Two-slabbed microchannel evaporator - V-shaped MCHX - Utilized finite volume method - Flash gas bypass - Flash tank - Microchannel evaporator - Liquid line/suction line HX - Microchannel HX Nature of Study Major Findings - Mean deviation from experiment was 6.8% Energy √ √ √ Exergy Evaporator - 33% performance increase in the microchannel evaporator compared to the round fin tube HX - Performance of microchannel evaporator can be improved significantly by increasing the two-phase region - FGB improved heat transfer by 9% and COP by 7% - Microchannel evaporator minimized pressure drop and improves refrigerant distribution - R744 showed lower COP than R22 - Better transport properties and isentropic compression did not compensate for thermodynamic disadvantage of R744 - R744 evaporator operated with fewer irreversibilities than R22 evaporatorPDF Image | Recent Advances in Transcritical CO2 (R744) Heat Pump System
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