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5 – Experimental Results The heat transfer surface of the DHW reheating gas cooler unit was less than 10% of the total heat transfer area for the tripartite gas cooler. How- ever, due to the relatively large average temperature difference between the CO2 and the water, the heating capacity of the gas cooler unit constituted as much as 22 to 36% of the total heating capacity for the tripartite gas cooler. The lowest heating capacity was measured at 33/28oC supply/return temperatures for the space heating system and 80°C hot water (31.4% DHW heating capacity ratio), whereas the largest heating capacity was measured at 40/35°C supply/return temperatures and 60oC hot water temperature (69.3% DHW heating capacity ratio). Temperature Characteristics of the Tripartite Gas Cooler Figure 5.25 shows the principle of the tripartite gas cooler for preheating of hot water (DHW-P), low-temperature space heating (SH) and reheating of hot water (DHW-R). The variables T1, T2, T3 and T4 represent the inlet and outlet CO2 temperatures for the three gas cooler units. CO2 Outlet T4 DHW-P Figure 5.25 T3 T2 CO2 T1 Inlet SH DHW-R Principle of the tripartite gas cooler. For each measuring series at fixed set-point temperatures for the space heating and DHW systems, both the inlet and outlet CO2 temperature from the space heating gas cooler (T2 and T3) remained virtually constant when the high-side pressure was gradually increased. Table 5.2 presents an overview of the CO2 temperatures for the different measuring series. Table 5.2 Overview of the measured CO2 temperatures at the inlet (T2) and outlet (T3) of the space heating gas cooler unit during operation in the combined mode. DHW Temperatures 60oC 70oC 80oC Inlet – Outlet CO2 Temperatures for the SH Gas Cooler SH 33/28oC 44 – 29oC 49 – 29oC 55 – 29oC SH 35/30oC 44 – 31oC 50 – 31oC 56 – 31oC SH 40/35oC 46 – 36oC 51 – 36oC 56 – 36oC 132PDF Image | Residential CO2 Heat Pump System for Combined
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