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Originally the gas cooler of the heat pump unit will receive its water from the bottom of the water tank (blue line with valve at the bottom of the tank). If a large amount of heat is “taken away” to the radiator system in a short time, i.e a large heating demand, the important stratification in the water tank will be destroyed. Furthermore, due to the water’s thermal capacity in the tank, the influence of the radiator’s heating load variation on the water inlet temperture to the heat pump will be delayed and it will therefore make it hard to control the water inlet temperature to the heat pump at a desired low value. To aviod test conditions where the stratification is destroyed and to make it easier to control the water inlet temperature to the heat pump, the connection where the heat pump takes water from the tank has been modified . As shown in the figure (Figure 8), the pipe at the bottom of the tank is closed. Instead, the connection on the side of the tank, which used to be the connection for radiator return loop to the tank, has been changed to a three way connection to the heat pump water inlet. In case there is a large heating demand in the radiator during the testing, the cold radiator return water will directly be pumped into the heat pump gas cooler instead of forcing it to return to the water tank and mix and thus destroy the temperature stratification in the tank. Figure 8 Layout of tank inside 16PDF Image | CO2 heat pumps for the Swedish market
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