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11 10 9 8 7 6 5 4 Figure 3.11 Efficiency with finite displacement compressor 3.5 Ideal cycle conclusions For both transcritical and subcritical cycles, the thermodynamic cycle can be specified with only an evaporating temperature, a condensing pressure and a refrigerant exit temperature from the gas cooler. The supply air temperature comfort constraint in heating is met by increasing the condensing pressure or refrigerant mass flow rate, and in cooling the dehumidification comfort constraint is met by decreasing the evaporating temperature. In cooling mode, R410A shows much higher efficiency than R744 for the same evaporating temperature. The difference between the two cycles is in their heat rejection temperatures, which is lower for R410A. The value of such a comparison is limited, however, because the subcritical cycle requires an infinite condenser air flow rate to approach the ideal cycle, while R744 can achieve it at a finite flow rate due to its supercritical temperature glide. In heating mode, R410 and R744 have comparable efficiencies at high supply air temperatures, with R410A having higher efficiency at lower supply air temperatures. The supply air temperature at which the efficiency of R410A and R744 is matched depends on the evaporating temperature. The primary advantage of R744 in the ideal cycle in heat pump operation is evident if the effect of a finite capacity compressor is included. Increased capacity of R744 at lower outdoor temperatures translates into reduced dependence on lower efficiency supplementary heating and higher overall heating efficiency. -20 -15 -10 -5 -0 5 10 Evaporating Temperature (C) R410A 21 R744 Heating COPPDF Image | Comparison of R744 and R410A
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