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5 – Experimental Results the average room temperature during testing was about 21oC. The water flow rate from the tank ranged from about 0.6 to 2.5 l/min, which corres- ponds to a gas cooler heating capacity in the range from approximately 2.1 to 8.7 kW at 50 K temperature difference for the water. 60 50 40 30 20 10 0 2.5 l/min Tm~39.5oC 1.3 l/min Tm~37.5oC 0.9 l/min Tm~35.0oC Start 0. 6 l/min Tm~34.5oC thermocli End thermocline zone ne zone 0.0 0.5 1.0 1.5 2.0 2.5 3.0 Time [h] 3.5 4.0 Figure 5.59 The measured outlet water temperature from the 200 litre DHW tank during the charging mode at various water flow rates. The initial cold water volume was 80 litres, and the initial water temperatures were about 5 and 56oC. The measurements gave the outlet water temperature from the bottom of the tank, which may represent the inlet water temperature to the DHW preheating gas cooler unit during the charging period. The measured average temperature (Tm) for the dynamic thermoclines in Figure 5.59 was higher than that of the static thermoclines in Figure 5.58. This was a result of mixing of water at different temperature levels at the tube inlet at the bottom of the tank due to the relatively high water velocity (0.15 to 0.55 m/s) through the ID 10 mm pipeline. The higher the velocity, the higher the average temperature of the thermocline zone. 5.2.2 Testing of a Movable Insulating Plate One way to reduce the internal conductive heat transfer and eliminate the mixing of hot and cold water in circular DHW tanks, is to separate the water volumes by means of a movable plate with low thermal conduc- tivity. Details concerning the experimental set-up, the instrumentation as 165 Temperature [°C]PDF Image | Residential CO2 Heat Pump System for Combined
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