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4 – Test Rig Design and Experimental Methods Figure 4.28 shows the largest insulating plate with the balancing weight. Figure 4.28 The underside of the largest insulating plate. 4.2.2 Temperature Measurements 4.2.2.1 Introduction The purpose of these experiments was to measure the transient tempe- rature drop in the DHW tank at various operating conditions. All tempera- ture measurements were carried out with Type T (Cu/K) thermocouples, which were connected to a Fluke Hydra 2625 data logger. The data logger was equipped with an accurate internal reference point using a Pt100 sensor, and the thermocouples were calibrated by means of melting crushed ice. The absolute uncertainty of the thermocouples was ±0.2oC. During all tests the tank was insulated with a 40 mm glass-wool mat. 4.2.2.2 Transient Temperature Drop in a DHW Tank With reference to Section 3.3.3.1, Heat Loss Through the Tank Walls, the overall heat transfer coefficient (U-value) of the prototype DHW tank was estimated on the basis of the measured transient temperature drop [oC/s] for the hot water at specified boundary conditions. Experimental Procedure The 200 litre polycarbonate tank was filled with 56oC water from the common hot water system in the building. The temperatures at the centre of the tank and at the tank wall were measured by means of 16 thermo- couples attached to an OD 8 mm plastic tube, Figure 4.29. The average room temperature during the 24 hour test period was about 22oC. Total weight 10.952 kg Metal plate Diameter 463 mm 50 mm XPS Diameter 495 mm Underside 102PDF Image | Residential CO2 Heat Pump System for Combined
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