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20 20 10 10 00 10 10 55 No internal heat exchanger Evaporating temperature=8.3 C With internal heat exchanger Evaporating temperature=8.3 C 00 40 60 80 100 40 60 80 100 Maximum Supply Air Temperature (C) Maximum SupplyAir Temperature (C) Figure 3.5 Effect of increasing flow rate at a constant pressure on maximum supply air temperature and cycle efficiency for R744 18 16 14 12 10 R744 8 6 4 Figure 3.6 Comparison of cycle efficiency based on maximum supply air temperature (both cycles with IHX) The slopes of the constant pressure lines in Figure 3.5 are considerably different in the cycle with the suction line heat exchanger as compared to the cycle without. In the cycle without an internal heat exchanger, since the evaporating temperature is fixed and the discharge pressure is constant, the discharge temperature from the compressor is fixed. As the refrigerant mass flow rate is increased, the air/refrigerant pinch point moves very little. R410A Evaporating Temperature: 8.3 C 20 40 60 80 100 Maximum Supply Air Temperature (C) 16 7600 kPa 8000 kPa 8500 kPa 9000 kPa 9500 kPa 10000 kPa 10500 kPa 11000 kPa 11500 kPa 7600 kPa 8000 kPa 8500 kPa 9000 kPa 9500 kPa 10000 kPa 10500 kPa 11000 kPa 11500 kPa 12000 kPa Efficiency Heating COP Ref. Mass Flow Rate (g/ s per kW Cap.) Heating COP Ref. Mass Flow Rate (g/ s per kW Cap.)PDF Image | Comparison of R744 and R410A
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