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The design of an integrated CO2 heat pump system can be classified as follows: External CO2 gas cooler – The gas cooler is connected to a single-shell DHW storage tank by means of a closed water loop. An inverter controlled pump circulates the water from the bottom of the tank through the gas cooler and back to the top of the tank. The heat pump can be equipped with: • A single gas cooler unit • A bipartite gas cooler, i.e. two gas cooler units with serial or parallel connection on the CO2 side • A tripartite gas cooler, i.e. three gas cooler units with serial connection on the CO2 side Integrated CO2 gas cooler and DHW storage tank – The gas cooler can be designed as a tube coil, multi- port extruded (MPE) tube etc., and mounted inside the tank, at the tank surface or in a thermosyphon unit. The heat exchanger for the space heating system can be located: • Inside the DHW tank • Outside the DHW tank Single gas cooler unit – Figure 3.5 shows principle examples of a single external gas cooler (GC1) which is connected to a single-shell DHW storage tank and a space heating (SH) heat exchanger T1.1, T1.2 or T1.3. EcoCute system design or or Figure 3.5 Principle illustration of a single external gas cooler and possible designs for the single-shell DHW tank and the space heating (SH) heat exchanger. GC=gas cooler, CW=city water. Two or three gas cooler units – Figure 3.6 shows principle examples of possible configurations of external bipartite and tripartite gas coolers (GC2.1, GC2.2, GC2.3 and GC2.4) which are connected to a single-shell DHW storage tank (T2.1). Integral gas cooler design – Figure 3.7 shows principle examples of possible integral designs for the CO2 gas cooler and a single-shell DHW storage tank. The combination of a single external gas cooler unit and a single-shell DHW storage tank with one internal and one external heat exchanger, is being used in the integrated EcoCute air-to-water CO2 heat pumps from Japan. The main disadvantage of this design is that high-temperature water from the hot water storage tank is International Energy Agency (IEA) Heat Pump Programme – Annex 32 – Workshop in Kyoto, Japan – December 6th, 2007 8PDF Image | INTEGRATED CO2 HEAT PUMP SYSTEMS
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