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4 – Test Rig Design and Experimental Methods 4.1.5 Test Procedures and Test Programme Since all components were manually controlled, a period of 1 to 3 hours was required to stabilize the heat pump system at the selected set-points. Logging was carried out 15 minutes after the system had stabilised. Figure 4.22 provides an overview of all controllable components and the set-points for each sub-system. The component (Tag) numbers refer to the sketches in Figures 4.1, 4.17, 4.19 and 4.20. DOMESTIC HOT WATER SYSTEM Component control • Ball valve BV3.7 Position • Needle valve ACV3.1 Position • BallvalveBV3.8 Open/closed Set Points • Inlet city water temperature (3T1) • Outlet hot water temperature (3T4) SPACE HEATING SYSTEM Component control • Pump 4.1 rpm • Pump 4.2 rpm • Pump 4.3 Step 1, 2, 3 - On/off • HCV5.1 / HCV4.2 Position (by-pass) • Ballvalves(4.1-4.4) Open/closed Set Points • Inlet water tempe- rature (4T1) • Outletwatertempe- rature (4T2) ENERGY WELL (HEAT SOURCE) Component control • Brine pump (2.1) rpm • Brine pump (2.2) On/off • El. heater (Variac) Electric power • HCV2.2 / HCV2.3 Position (by-pass) • HCV2.1 (cooling) Position • Ball valve BV2.3 By-pass (open/closed) Set Points • CO2 evaporation pressure (1P1) • Inlet temperature SH system (4T1) PROTOTYPE CO2 HEAT PUMP UNIT Component control • Compressor rpm (6000-constant) • Back-pressure valve Position • Ball / needle valves Pos., open/closed Set Points • Heating mode: o SH only o DHW only o SH + DHW • Inlet pressure to the gas cooler (1P2) • Compressor suction temperature (1T3) Figure 4.22 Overview of controllable components and set-points. Table 4.17 shows the ranges for the different set-points and the maximum tolerable deviation. The heat pump system was run in three different modes: 1) Space heating mode (SH), 2) Hot water heating mode (DHW) and 3) Combined heating mode (SH+DHW). When the system was operated in the space heating mode, the circulation in the hot water system was stopped. In the DHW mode, the CO2 flow was by-passed the space heating gas cooler unit. For all test series, the evaporation temperature and the superheating of the suction gas were kept constant in order to provide constant inlet condi- tions for the compressor. The suction gas superheat and the mass flow rate were controlled by adjusting the ball valves for the suction gas heat exchanger and the oil return valve. The latter valve determined the inlet vapour quality to the suction gas heat exchanger. 95PDF Image | Residential CO2 Heat Pump System for Combined
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