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Compared with the results obtained with boiler placed at position 1, similar results can be found with boiler placed at position 2 as well. The differences in results for the two different positions are that the defrosting cycle happened less often and the ice layer was more evenly distributed on the evaporator fins with boiler placed at position 2. More testing results and pictures can be found in Appendix 1. Stage 4. The water tank, as a heat reservoir, connects the heating loads (radiator and hot tap water) and the heat pump unit. The heating demand of the radiator and the hot tap water will directly influence the temperature distribution of the water in the tank and this will indirectly influence the heat pump water inlet temperature (inlet water temperature to the gas cooler). At the same time, the hot water produced by the heat pump unit will be transferred back to the water tank and it will influence the water temperature distribution in the tank as well as the temperature for the outgoing radiator water at the same time. Therefore, the water tank works as a “heat damper” between the load side and the heat pump side. The tank has therefore a crucial influence on the system performance and it is therefore important to study its performance more in detail. In the water tank tests, six T-type thermocouples are placed on the outside of the tank shell (inside the insulation) at even distances from the bottom to the top of the water tank (Figure 26). The tests are mainly focused on the water temperature distribution in the tank. T1 T2 T3 T4 T5 T6 Figure 26. Position of the thermocouple in the water tank tests 34PDF Image | CO2 heat pumps for the Swedish market
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