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7 – Discussion and Analysis Table7.3 The measured/calculated COPs for the three heat pump systems at the selected boundary conditions. CO2 Heat Pump Unit – Prototype1 COPSH COPDHW COPSH COPDHW System design COPSH COPDHW Approx. 3.0 Approx. 3.8 Approx. 3.9 CO2 Heat Pump Unit – Improved Prototype2 COPCOMB5 Combined mode at 0/35oC and 60oC Space heating (SH) mode at 0/35oC Hot water (DHW) mode at 60oC No reheating of DHW required Approx. 3.3 Approx. 4.2 Approx. 4.3 High-Efficiency State-of-the-Art Heat Pump Unit (R-407C or R-410A)3 COPCOMB5 Combined mode at 0/35oC and 60oC Space heating (SH) mode at 0/35oC Hot water (DHW) mode at 60oC No reheating of DHW required System with shuttle valve and prioritized DHW heating4 Approx. 4.6 Space heating (SH) mode at 0/35oC Approx. 3.0 Hot water (DHW) mode at 0/55oC DHW reheating required, 13% (from 53 to 60oC) 1) Ref. Section 5.1.3, Experimental Results 2) Ref. Section 5.1.3 and Section 7.2.4, Possibilities for Efficiency Improvements 3) Ref. Appendix B, Performance Testing of Residential Brine/Water-to-Water Heat Pumps 4) Ref. Figure 2.4, Section 2.4.2.3, Examples of System designs 5) DHW heating capacity ratio during the combined mode approx. 0.55 (ref. Figure 5.11) In the calculations it was presupposed that the inlet water temperature to the DHW preheating gas cooler unit for the CO2 heat pumps was identical to the city water temperature. This implies that the effect of the thermodynamic losses in the DHW tank during the tapping and charging periods was not taken into account (ref. Section 7.1.2.4). 7.3.3 Results The estimated SPFs for the three heat pump systems during monovalent and bivalent operation are presented as a function of the seasonal DHW heating capacity ratio in Figures 7.7 and 7.8. 226PDF 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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