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4 – Test Rig Design and Experimental Methods BPV1.1 NV1.4 Figure 4.16 The expansion valves in the test rig. 4.1.2.9 Pipelines The pipelines at the low-pressure side of the test rig were round OD/ID 10/8 mm stainless steel tubes, whereas round OD/ID 8/6 mm stainless steel tubes were used for the high-pressure side. The tubes and compo- nents were joined by means of Swage Lock fittings. 4.1.3 Design of the Other Sub-Systems 4.1.3.1 The Heat Source System The main purpose of the heat source system was to supply heat to the CO2 evaporator as well as to provide cooling of the space heating system whenever required (ref. Section 4.1.3.3). Figure 4.17 sketches the heat source system. The system consisted of a 150 m deep ID 135 mm borehole (energy well), which was connected to the evaporator by means of a round OD/ID 40/32 mm PEM pipeline. Potassium formate (Hycool 20), with a freezing point of -20°C, was used as the secondary fluid (brine). The main circuit was equipped with an inverter controlled pump (Pump2.1), a 5 kW electric heater connected to a variable resistance (Variac) as well as a brine vessel and an expansion system. The evaporator was either directly connected to the energy well, or operated in a closed loop together with the pump and the electric heater. The parallel circuit, which comprised a plate heat exchanger (PEH2.1), a hand control valve (HCV2.1) and a pump (Pump2.2) with fixed rpm, was used to cool the return flow in the space heating system whenever required. The maximum cooling capacity was about 10 kW. 83PDF Image | Residential CO2 Heat Pump System for Combined
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