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flow rate increases the approach temperature difference between the refrigerant exit temperature from the heat exchanger and the air inlet temperature, which considerably reduces the efficiency of the ideal cycle, as shown in Figure 3.5. The solid lines in Figure 3.5 show the efficiency of the cycle, and the dashed lines show the corresponding refrigerant mass flow rate, and results for cycles both with and without a suction line heat exchanger are shown. The diamonds indicate the zero approach temperature condition; the lines coming off the diamonds show the effect of increasing the refrigerant mass flow rate at the noted pressure. Therefore, the ideal cycle which satisfies the supply air comfort constraint with the greatest efficiency is the one in which the mass flow rate is adjusted for a zero approach temperature. The high side pressure, which can be adjusted independently, determines the supply air temperature. High side pressure, P=P1, mr=mr1 High side pressure, P2>P1, mr=mr1 High side pressure, P=P1, mr>mr1 Net Heat Transfer From Refrigerant Figure 3.4 Effect of pressure and refrigerant mass flow variations on maximum supply air temperature 15 TemperaturePDF Image | Comparison of R744 and R410A
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