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4 – Test Rig Design and Experimental Methods Discharge line Suction line 2nd 1st Figure 4.6 Principle of the Sanyo hermetic two-stage rolling piston compressor (Bouma, 2002). The compressor was charged with about 400 g of PAG oil. Although the oil discharge from the rolling piston compressor was quite high (ref. Table 4.2), it was decided to operate the unit without an oil separator. The main reason for this was that the construction of the prototype heat pump unit was considerably overdue, and construction and testing of a tailor-made oil separator would have delayed the project further. Reference is made to Section 5.1.3.7, Evaporator Performance, and 5.1.3.8, Performance and Main Operating Characteristics of the Tripartite Gas Cooler, regarding the impact of the lubricant on heat transfer in the evaporator and the tripartite gas cooler. The estimated overall isentropic efficiency and the relative heat loss for the compressor at various operating conditions are presented in Section 5.1.3.6, Compressor Performance. 4.1.2.3 The Evaporator The evaporator was a helical counter-flow tube-in-tube heat exchanger. The main reason for selecting this type of heat exchanger was the mode- rate costs, and the fact that the heat exchanger could be easily constructed at the engineering workshop of NTNU, Department of Energy and Process Engineering. Table 4.3 shows the specifications of the evaporator. A copper wire with suitable thickness was wrapped as a spiral around the inner CO2 tube in order to maintain uniform distance between the CO2 tube and the brine tube. Figure 4.7 shows a sketch of the cross section of the tubes and the centring wire, whereas Figure 4.8 shows the evaporator mounted in the test rig before the plant was insulated. 74PDF 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
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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