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J. Stene / International Journal of Refrigeration 28 (2005) 1259–1265 1261 Fig. 2. Illustration of the heat rejection process for a counter-flow tripartite CO2 gas cooler operating in the space heating (SH) mode, DHW mode and combined mode. The heat rejection process in the three different operating modes is illustrated in temperature–enthalpy diagrams in Fig. 2 [7]. The supply/return temperatures for the floor heating system are 35/308C, while the city water temperature and the set-point for the DHW are 6.5 and 70 8C, respectively. In the combined mode, the so-called Table 1 Specifications for the prototype brine-to-water CO2 heat pump unit DHW heating capacity ratio is about 45%, which means that 45% of the total heating capacity of the tripartite gas cooler is used for hot water heating. In the combined mode, the counter-flow tripartite gas cooler enables a small temperature approach (DTA) at a moderate high-side pressure. As a consequence, the COP Compressor Evaporator Tripartite gas cooler Suction gas heat exchanger Hermetic two-stage rolling piston—operated as a single-stage unit Swept volume—1.19 m3/h at 6000 rpm Lubricant—polyalkylene glycol (PAG) Counter-flow single-pass tube-in-tube HX—stainless steel Surfaces CO2/brine side: 0.30/0.38 m2 Counter-flow single-pass tube-in-tube HX—stainless steel Surfaces CO2 side: (A) 0.26 m2, (B) 0.28 m2, (C) 0.07 m2—total 0.61 m2 Surfaces water side: (A) 0.35 m2, (B) 0.38 m2, (C) 0.09 m2—total 0.82 m2 Counter-flow single-pass tube-in-tube HX—stainless steel Surfaces: 0.06/0.07 m2 LPR and manually operated back-pressure valve High-side pressure control A, B and C refers to the tripartite gas cooler units for preheating of DHW, space heating and reheating of DHW [7]PDF Image | Residential CO2 heat pump system space and hot water heating
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