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5 – Experimental Results higher discharge gas temperature from the compressor led to a 20% larger water flow rate in the hot water circuit, and since the specific heat capacity of the CO2 in the near critical region was considerably lower than at 7.5 MPa, the temperature approach dropped by 13 K. Table 5.1 Measured values for the CO2 heat pump unit at 60oC DHW temperature, 35/30oC supply/return temperatures for the SH system and variable high-side pressure. Measured Values Evaporation temperature [oC] Compressor discharge gas temp. [°C] Inlet temperature expansion valve [oC] Compressor input power [W] Heating capacity - Space heating [W] Heating capacity - DHW preheating [W] Heating capacity - DHW reheating [W] Total heating capacity [W] DHW heating capacity ratio [-] 1) COP [-] Temperature approach [K] 7.5 8.0 8.5 9.0 MPa MPa MPa MPa -5.0 -5.1 -5.1 -5.0 75.5 81.6 86.4 90.6 30.5 18.0 9.8 8.5 1610 1700 1775 1880 1910 2730 2940 2600 1300 1670 1610 1550 1510 1830 2360 2800 4722 6230 6907 6947 0.60 0.56 0.57 0.63 2.93 3.67 3.89 3.70 23.4 10.6 2.8 1.8 1) The ratio of the heating capacity for heating of DHW and the total heating capacity of the tripartite gas cooler (ref. Eq. 3.5, Section 3.2.4.2, Operational Characteristics). At 8.5 MPa, the temperature approach dropped off by another 8 K, and an additional 0.5 MPa rise in the high-side pressure had only a marginal effect of the temperature approach and the total heating capacity of the tripartite gas cooler. Hence, for this particular test series the maximum COP of 3.89 was measured at 8.5 MPa high-side pressure. Figure 5.6 provides an overview of the measured maximum COPs and the respective optimum high-side pressures for all the measuring series in the combined mode. Since the measurements were carried out at 0.5 MPa intervals, the indicated optima for the high-side pressures for each mea- surement series should only be regarded as approximate values. For the same reason, the maximum COP for the heat pump at the different opera- ting conditions may be slightly higher than the measured values. 119PDF 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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