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14 12 10 8 6 4 2 0 Figure 4.4 Efficiency for system with fixed capacity compressor 2.5 2.0 1.5 1.0 0.5 0.0 Figure 4.5 Load/capacity curve for system with variable capacity compressor The differences in efficiency between R410A and R744 will be discussed in the following sections. However, one important difference between the two refrigerants that can be seen in Figures 4.3 and 4.5 is the change in capacity as a function of temperature. Similar to what was seen in the ideal cycle, with the compressors sized for equal cooling capacity at an outdoor temperature of 45oC, the heating capacity of R744 is approximately 40% higher than for R410A for both 40 and 60oC supply air temperatures. The efficiency of the two refrigerants is approximately equal for a 40oC supply air temperature; for a 60oC supply air temperature the efficiency of R744 is 5 to 10% higher than R410A. This increased capacity reduces the need for supplementary heating on cold days, which increases the overall seasonal efficiency. Heating mode Cooling mode -20 -10 -0 10 20 30 40 50 60 Outdoor Temperature (C) R744, Evaporating temp: 12 C R744, Supply air temp: 40 C R744, Supply air temp: 60 C R410A, Evaporating temp: 12 C R410A, Supply air temp: 40 C R410A, Supply air temp: 60 C Heating load -20 -10 -0 10 20 30 40 50 60 Outdoor Temperature (C) Cooling load 27 Load/Capacity (kW) COPPDF Image | Comparison of R744 and R410A
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