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Figure 14. Test rig layout for the system tests. In the system tests, city water with a constant temperature is used as a cooling media for the plate heat exchanger. The water temperature to the radiator system (point 3) is determined by the heat pump control algorithm, which is a function of outdoor temperature (this can be seen later on in the test results). The out-going water temperature from the heat pump unit (point 5) to the water tank is about 60 oC, which is the set point of the heat pump. The heat pump will adjust its compressor’s speed and the water circulation rate between the heat pump unit and the water tank to meet this temperature demand. The cooling water circulating rate is adjusted manually to maintain a certain temperature drop cross the radiator system. Based on practical experience and values found in literature, a 5K temperature drop across the plate heat exchanger can be used to simulate testing typical conditions for a low temperature floor heating systems [4]. For a 10-15K1 temperature drop, the test condition corresponds to a low flow radiator system for Swedish conditions. For conventional radiator systems as well as floor heating, temperature changes in the heating water circuit of 5 to 8 K are considered typical. After considering the factors mentioned above and the capacity limit of the heat pump without electric heater, the following testing conditions are chosen (Table 2): 1 Statements from the German radiator technical company “Hennemann” give as upper level spreads of about 10- 15K. 24PDF Image | CO2 heat pumps for the Swedish market
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