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6 5 4 3 2 1 0 Figure 5.6 Comparison of overall annual efficiency as function of heating load requirement for 60oC supply air As discussed in Section 4.4.1, the compression ratio for R744 is lower for elevated supply air temperatures, which translates into higher efficiency. This is seen in Figure 5.5, which shows the capacity and efficiency for a 1 kW load at –10oC and a supply air temperature of 60oC. While R410 still shows a dominant advantage for Dallas/Ft. Worth, in Chicago the annual operating efficiency of R744 is about 9-16% higher than R410A depending on the load requirement, and in Seattle R744 is about 10% more efficient than R410A. -20 -15 -10 -5 R744, Dallas/Ft. Worth R410A, Dallas/Ft. Worth R744, Seattle R410, Seattle R744, Chicago R410A, Chicago Outdoor Temperature for 1 kW Heating Load (C) 47 Annual Average EfficiencyPDF Image | Comparison of R744 and R410A
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