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5 – Experimental Results 4.0 3.5 3.0 2.5 7.5 8.0 8.5 9.0 9.5 10.0 Gas Cooler Pressure [MPa] 3.57 3.44 3.24 33/2 35/3 40/3 8°C, 80°C 0°C, 80°C 5°C, 80°C Figure 5.17 The measured COP at 80oC DHW temperature and varying supply/return temperatures for the SH system. The high-side pressure had a considerable impact on the average tempe- rature difference between the CO2 and the water in the space heating gas cooler, which in turn affected the heating capacity and the CO2 outlet temperature. By increasing the high-side pressure, the total heating capacity of the tripartite gas cooler increased, but at the cost of a higher power input to the compressor. For the measuring series displayed in Figures 5.15 through 5.17, the optimum high-side pressure rose by approximately 1 MPa when the hot water temperature was kept constant and the supply/return temperatures for the space heating system was altered from 33/28oC to 40/35°C. With the exception of the measuring series at 33/28°C supply/return temperatures and 60oC hot water tempera- ture, the COP curves were relatively flat near the maximum values, and the COP decreased by about 2.5 to 5.5% at ±0.5 MPa deviation from the optimum high-side pressure. Although the highest COP was measured at the lowest supply/return temperatures, the maximum COP at the optimum high-side pressure was relatively insensitive to variations in the temperature level in the space heating system. At 60°C hot water temperature, the maximum COP dropped off by approximately 3% when the supply/return temperatures was increased from 33/28oC to 40/35oC. At 70 and 80oC hot water tempe- rature, the corresponding figures were about 6% and 9%, respectively. According to Figure 5.11, the main reason for the relatively constant COP was the considerable variations in the DHW heating capacity ratio at different temperature levels in the space heating system. By altering the supply/return temperatures from 33/28oC to 40/35oC, the DHW heating 126 COP [-]PDF Image | Residential CO2 Heat Pump System for Combined
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