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5.9 5.7 5.5 5.3 5.1 4.9 4.7 4.5 4.3 4.1 3.9 3.7 3.5 Figure 4.17 Effect of finite area gas cooler on heating cycle efficiency (real compressor, evaporating temp: 2.3 C) 5.9 5.7 5.5 5.3 5.1 4.9 4.7 4.5 4.3 4.1 3.9 3.7 3.5 Solid: R744 Open: R410A Evaporating Temp: 2.3 C (Evaporating Temp: 2.3 C) Proposed R744 prototype R410A baseline results 0123456789 2 Air Side Area (m /kW) Supply Air Temperature: 40 C Supply Air Temperature: 60 C Gas Cooler/Condenser Exit Temperature: 21 C 23 C 25 C 27 C 29 C 0123456789 Air Side Area per kW (m2) Figure 4.18 Effect of finite area gas cooler on heating cycle efficiency (real compressor, evaporating temp: 2.3 C) In heating mode, an airflow rate of 0.052 kg/s per kW capacity is required to warm air from 21 to 40oC. In Figure 4.15, which showed the required airflow rate for a given capacity and airflow rate in cooling mode, it was assumed that the heat transfer coefficient was 90 W/m2 K at a flow rate of 0.052 kg/s. As a result, the results from 37 R410A, Max Supply Air Temp: 40 C R744, Max Supply Air Temp: 40 C R744, Max Supply Air Temp: 60 C R410A, Max Supply Air Temp: 60 C Heating COP Heating COPPDF Image | Comparison of R744 and R410A
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