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7 – Discussion and Analysis 7.2 Exergy Analysis of the Prototype CO2 Heat Pump System The prototype CO2 heat pump system was analysed by means of the exergy method (ref. Section 3.2.5, Exergy Analysis). The main intention of the analysis was to get a better understanding of the CO2 heat pump process and to reveal the possibilities for efficiency improvements. The exergy analysis was based on experimental data at -5oC evaporation temperature, 33/28oC and 40/35oC supply/return temperatures for the space heating (SH) system and a DHW temperature of 60 and 80oC. The total exergy balance for the prototype CO2 heat pump system (ref. Eq. 3.14, Section 3.2.5), showed that the total heat loss from tubing, heat exchangers and other components excluding the compressor typically ranged from 80 to 160 W. The heat loss depended on the operating mode and the average temperature level during heat rejection. 7.2.1 The Combined Mode Figure 7.4 shows the exergy losses for the CO2 heat pump system during operation in the combined mode at optimum high-side pressure and temperature programmes 33/28-60oC and 40/35-80oC. The numbers at the top of the bars represent the measured COP of the heat pump unit. 1600 1200 800 400 0 3.98 73 33/28-60°C 3.24 48 164 159 111 134 37 60 11 67 574 Space Heating System Expansion Valve GC DHW-Preheating GC Space Heating GC DHW-Reheating Compressor Evaporator 655 105 107 40/35-80°C Figure 7.4 The exergy losses for the prototype CO2 heat pump system at optimum high-side pressure during operation in the com- bined mode at 33/28-60oC and 40/35-80oC (SH-DHW). 218 Exergy Loss [W]PDF Image | Residential CO2 Heat Pump System for Combined
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