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10000 9500 9000 8500 8000 7500 7000 100 90 80 70 60 50 40 30 20 10 0 Supplementary Heating Req'd Supplementary 8 Heating Req'd Variable supply air temperature Fixed supply air temperature -20 -10 -0 10 20 Evaporating Temperature (C) -20 -10 -0 10 20 Evaporating Temperature (C) 7 6 5 4 3 2 1 4 Heating Req'd 3 2 Variable supply air temperature Fixed supply air temperature Supplementary Heating Req'd 1 Variable supply air temperature Fixed supply air temperature -20 -10 -0 10 20 Evaporating Temperature (C) 0 -20 -10 -0 10 20 Evaporator Temperature (C) Supplementary Variable supply air temperature Fixed supply air temperature Figure 4.14 Comparison of fixed supply air temperature and variable supply air temperature supplementary heating configurations 4.5 Comparison of heat exchanger sizes required for heating and cooling 4.5.1 Indoor coil sizing The challenge in designing a system to operate in both heating and cooling mode is optimizing the design of the heat exchangers to run well in both conditions. In cooling mode, the dehumidification comfort constraint determines the evaporating temperature, and the heat exchanger area required is a function of the airflow rate. Based on the assumptions listed in Table 4.1 the relationship between indoor airflow rate and required indoor coil airside area is plotted in Figure 4.15 for a sensible heat ratio (SHR) of 0.75 and for capacities of 1 and 0.5 kW. Because such a large surface/air temperature difference is required to achieve a SHR of 0.75 based on air inlet conditions of 27oC and 50% RH, the heat exchanger area 34 Supply Air Temperature (C) Gas Cooler Pressure (kPa) Gas cooler air flow rate (m 3/min) Overall EfficiencyPDF Image | Comparison of R744 and R410A
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