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5 Experimental Results This chapter expands on Chapter 4, Test Rig Design and Experimental Methods, and provides a detailed presentation of the experimental results from the following test rigs: ♦ A 6.5 residential brine-to-water CO2 heat pump unit for combined space heating and hot water heating (prototype). ♦ A 200 litre cylindrical single-shell domestic hot water (DHW) tank including two movable insulating plates (prototypes). 5.1 Testing of a Residential Brine-to- Water CO2 Heat Pump Unit 5.1.1 Function Testing The experimental set-up, the instrumentation and the experimental proce- dures for the prototype CO2 heat pump are described in Section 4.1, Testing of a Residential Brine-to-Water CO2 Heat Pump. Before the CO2 heat pump unit was insulated and connected to the secondary systems in the pilot house, extensive function testing and troubleshooting was carried out in order to: ♦ Detect possible leakages in the CO2 and water circuits. ♦ Discover operational problems and component malfunction, and repair or replace components, valves and tubing if necessary. ♦ Tune the set-point for the control valve in the oil return system. ♦ Find the optimum CO2 charge that ensured sufficient liquid feed to the evaporator and prevented wet suction gas at the compressor inlet at all operating conditions. 5 – Experimental Results 111PDF Image | Residential CO2 Heat Pump System for Combined
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