Comparison of R744 and R410A

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Comparison of R744 and R410A ( comparison-r744-and-r410a )

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12 10 8 6 R744, 16.7 C 5.0 R410A, 16.7 C 4.5 4.0 3.5 3.0 2.5 8.8 7.2 R410A, 16.7 C R744, 16.7 C R744, 8.3 C R410A, 8.3 C R410A, 8.3 C 4 7.2 7.6 R744, 1.7 C R410A, 1.7 C R744, -8.3 C R410A, -8.3 C 8.0 8.4 7.6 R744, 8.3 C R410A, 1.7 C R744, 1.7 C R410A, -8.3 C R744, -8.3 C 8.0 8.4 8.8 Discharge Pressure (MPa) Discharge Pressure (MPa) Figure 2.1 Heating performance comparison with matched heating capacity 14 12 10 8 6 R744, 16.7 C 4.5 4.0 3.5 3.0 R410A, 16.7 C R410A, 8.3 C R410A, 16.7 C R744, 8.3 C R744, -8.3 C 7.5 8.0 R744, 16.7 C R410, 1.7 C R744, 1.7 C R410A, -8.3 C 8.5 R744, 8.3 C R744, 1.7 C 7.0 7.5 R410A, 8.3 C R410A, 1.7 C R744, -8.3 C R410A, -8.3 C 8.0 8.5 9.0 7.0 Discharge Pressure (MPa) Discharge Pressure (MPa) Figure 2.2 Heating performance comparison with matched cooling capacity The higher capacity of the R744 system at lower outdoor temperatures becomes an important advantage when considering operation of a system in a typical residential application. A typical temperature-load curve is shown in Figure 2.3. Below the point that the load exceeds the capacity of the heat pump some sort of supplementary heating system would be required, typically electric resistance heaters. The higher capacity of R744 reduces the amount of supplementary heating required, which results in a higher overall system heating COP as compared to R410A. The points shown for R744 in Figure 2.3 are results from the tests when R744 compressor 6 Capacity (kW) Capacity (kW) Heating COP Heating COP

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