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4 – Test Rig Design and Experimental Methods at all operating conditions (liquid reservoir), and to prevent droplets from entering the compressor. The heat pump was originally equipped with a one litre LPR. However, at certain operating conditions the LPR turned out to be too small, and was therefore replaced by a 4 litre vessel. Refe- rence is made to Appendix A2.2, Methods of Controlling the High-side Pressure, for further details about the design and operation of the LPR. The heat pump unit was charged with approximately 2.5 kg of CO2. In order to ensure proper oil return and to provide liquid overfed in the eva- porator, an ID 4 mm stainless steel tube was installed between the bottom of the LPR and the top of the filter (Maidstone). A needle valve (Hook) was used to control the oil flow rate. Reference is made to Section 5.1.1, Function Testing, for details regarding function testing and operation of the oil return system. Figure 4.15 shows the one litre LPR and the oil return system. The filter is placed behind the control valve NV1.1 Figure 4.15 The LPR, the oil return pipeline/valve and the filter. 4.1.2.8 The Expansion Valves The test rig was equipped with two manually operated expansion valves, i.e. a needle valve (Hook) and a back-pressure valve (Tescom). The latter valve, which maintained a constant high-side pressure at each set point, was used in virtually all the experiments. Figure 4.16 shows the expansion valves installed in the test rig. NV1.1 82PDF Image | Residential CO2 Heat Pump System for Combined
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
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