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5 – Experimental Results capacity ratio increased by approximately 18 percentage points. Hence, the higher the temperature level in the space heating system, the larger the hot water heating capacity for the CO2 heat pump unit. This aspect is illustrated in Figure 5.18, where the heat rejection process in the tripartite gas cooler is displayed by means of T-Q diagrams at optimum high-side pressures, 32/28oC and 40/35oC supply/return temperatures for the space heating system and 60oC hot water temperature. 100 80 60 40 20 0 02468 Heating Capacity [kW] 9.0 MPa SH: 40/35oC DHW: 60oC A C B COP 3.86 100 80 60 40 20 0 02468 Heating Capacity [kW] 8.0 MPa SH: 33/28oC DHW: 60oC A C B COP 3.98 Figure 5.18 Illustration of the heat transfer process in the tripartite gas cooler in combined mode at optimum high-side pressures, 33/28oC and 40/35oC supply/return temperatures for the SH system and 60oC DHW temperature. According to Figure 5.18, the total heating capacity of the tripartite gas cooler at 40/35oC supply/return temperatures, exceeded the heating capa- city at 33/28°C by approximately 6%. This was due to the 8 K higher CO2 outlet temperature from the compressor and the 3.5 K lower temperature approach. The latter was in turn a result of the nearly 50% larger water flow rate in the hot water circuit. Since the power input to the compressor was about 9% higher at 40/35oC, the COPs for the two measuring series were virtually identical. Figures 5.19 through 5.21 show the measured COP for the CO2 heat pump unit as a function of the temperature approach at fixed set-point for the hot water temperature and varying supply/return temperatures for the space heating system. The higher the temperature level in the space heating system, the higher the DHW heating capacity ratio and the lower the approach temperature. The difference was, however, on average less than 3 K at 33/28oC and 40/35oC supply/return temperatures. 127 Temperature [°C] Temperature [°C]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
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