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7.1.2.3 The COP vs. the DHW Heating Capacity Ratio During operation in the combined mode, the DHW heating capacity ratio, which is defined as the ratio of the heating capacity for the DHW gas cooler units and the total heating capacity for the tripartite gas cooler, was heavily affected by the temperature levels in the SH and DHW systems. As shown in Figure 7.1, there was also a correlation between the DHW heating capacity ratio and the COP of the prototype CO2 heat pump unit. 7 – Discussion and Analysis 4.0 3.8 3.6 3.4 3.2 Figure 7.1 60°C 33/28°C 35/30°C 40/35°C 80°C 60°C 70°C 70°C 60°C 70°C 80°C 80°C 0.3 0.4 0.5 0.6 0.7 DHW Heating Capacity Ratio [-] The relationship between the COP and the DHW heating capacity ratio for the prototype CO2 heat pump unit at varying temperature levels in the SH and DHW systems. The experimental result can be summarized as follows: ♦ At constant temperature level in the SH system, the DHW heating capacity ratio dropped off in average by approx. 18 percentage points when the DHW temperature was increased from 60 to 80oC. ♦ At constant DHW temperature, the DHW heating capacity ratio dropped off in average by approx. 18 percentage points when the supply/return temperature for the SH system was increased from 33/28 to 40/35oC. The experimental results demonstrated that the higher the temperature level for the SH system and the lower the set-point temperature for the DHW system, the larger the DHW heating capacity ratio for the prototype CO2 heat pump unit. At 40/35oC supply/return temperature for the SH 209 COP [-]PDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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