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5 – Experimental Results temperature ranged from 33 to 40°C, and the temperature difference was kept constant at 5 K. In the combined heating mode and the DHW heating mode, the set-point for the hot water temperature was 60, 70 or 80oC. At fixed inlet and outlet temperatures for the space heating and hot water systems, the inlet gas cooler pressure was varied between 7.5 and 11 MPa in order to see its impact on the heating capacity and the COP of the heat pump unit as well as the temperature fit in the tripartite gas cooler. The calculation of the heating capacity for the tripartite gas cooler and the COP of the CO2 heat pump unit were carried out as follows: ♦ The heating capacities of the three gas cooler units for preheating of DHW, space heating and reheating of DHW were calculated on the basis of temperature and flow measurements in the water circuits. ♦ The measured power input to the compressor was corrected for the inverter efficiency when calculating the COP of the heat pump unit. The inverter efficiency at 100 Hz (6000 rpm) was approx. 0.95. ♦ The total power input to the pumps in the evaporator, space heating and hot water circuits was not included when calculating the COP of the heat pump unit. The measured values from each test series were processed by means of Microsoft Excel. Figures 5.2 and 5.3 illustrate one of the tailor-made spreadsheets as well as the T-h and T-Q diagrams that were used to display and analyse the measured values. About 80 tests were done during the experimental period. In the following sections, the COP, the heating capacity and the operational characteristics of the CO2 heat pump unit at 1) Simultaneous space heating and hot water heating (combined mode), 2) Hot water heating only (DHW mode) and 3) space heating only (SH mode) are presented and analysed. A comparison of the optimum high-side pressure during operation in the different modes (ref. Appendix A2.4, Optimum High-Side Pressure when Incorporating Real gas Cooler Performance) is also presented, and the performance of the compressor, the evaporator and the tripartite gas cooler is presented and analysed. The detailed test results are presented in Appendix C, Test Results for the Prototype CO2 Heat Pump. 114PDF Image | Residential CO2 Heat Pump System for Combined
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