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DESCRIPTION OF TEST FACILITY AND TEST EQUIPMENT The testing is performed in the refrigeration lab of Energy Department of Royal Institute of Technology (ETT lab). For the test, the outdoor unit is placed in a climate chamber, where different outdoor conditions were created down to -12 °C (in the test). The indoor tank is placed in the heated lab space outside the climate chamber. A plate heat exchanger, which is cooled by city water, is connected to the radiator connection of the tank to simulate the radiator system of a building. The data acquisition system is provided as part of the project by the Swedish company ClimaCheck AB [4]. The data acquisition software used was developed by ClimaCheck. The system is typically used to collect operational data from refrigeration, air- conditioning and heat pump systems in the field in order to monitor and evaluate their performances and to give suggestions on system optimization. The system also works excellent in a laboratory setting. Figure 9. Software operational window (from ClimaCheck) Figure 9 shows the standard ClimaCheck software operational window. As shown in the figure, the program collects data from both primary side (i.e. temperatures, pressures and mass flow rate on refrigerant side) and the secondary side (i.e. temperatures, flow rates on the water side). The power consumption of the compressor is also recorded by the system. PT1000 elements are used for the temperature measurements. The water volume flow to the heat pump is measured by an energy meter produced by Brunata. The compressor power is measured by a three-phase power analyzer (Type WM22-DIN). Only one phase of the three-phase power analyzer is however used due since the compressor is driven by DC power. The accuracy of the measurement instruments are summarized in Table 1. 17PDF Image | CO2 heat pumps for the Swedish market
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