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heat exchangers for R744 require either smaller tube diameters or thicker walls. We have selected microchannel heat exchangers with specially designed headers to withstand the higher operating pressures. 1.3 Basis of theoretical comparison The goal of the theoretical cycle comparison is to highlight important considerations with regard to R744 and R410A. These results should provide insight regarding heat exchanger design and cycle control for future work in improving the operating efficiency of practical R744 systems. In a traditional ideal cycle comparison, the ideal Evans-Perkins (reversed Rankine) cycle is fully specified by setting the evaporation temperature and condenser outlet temperatures equal to those of the heat source and sink, respectively. For the ideal transcritical cycle, the gas cooler outlet temperature replaces the condenser temperature, and the pressure is set to the value that yields the maximum cooling or heating COP (Lorentzen and Petterson, 1996). In this report, the ideal cycles are defined differently, by introducing comfort constraints. For the indoor coil in cooling mode, the ideal evaporating temperature is set far enough below the wetbulb temperature of the indoor air, to ensure adequate latent cooling capacity at the specified operating condition. In heating mode, the refrigerant temperature at the exit of the indoor coil is set equal to the desired supply air temperature. Theoretical calculations and experimental data reduction is done with EES (Klein and Alvarado, 2000). All refrigerant and air properties are based on internal functions within EES. 2PDF Image | Comparison of R744 and R410A
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