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4 – Test Rig Design and Experimental Methods In order to meet the special requirements for the prototype CO2 heat pump unit, the DHW tank was modified as follows: ♦ Stainless steel tubes for the hot and cold water inlet and outlet were mounted at the top and bottom of the tank, respectively. ♦ A simple diffuser was mounted at the end of the tube inside the tank in order to reduce the water velocity and consequent mixing of hot water and cold city water during tapping. The diffuser directed the water flow downwards in the tank, and reduced the water velocity by approximately 80%. ♦ Five 250 mm long stainless steel pockets for Pt1000 sensors were installed to enable measurements to be made of the vertical tempera- ture gradient in the centre of the tank. The same type of pockets was also installed at the inlet and outlet pipelines. ♦ Five ID 80 mm inspection glasses (PN 10) were mounted in the front and the back of the tank wall in order to study the water flow inside the tank. ♦ A back-up heating system was made from a 4 kW electric heater and stainless steel tubes with OD/ID of 54/48 mm and 34/28 mm. The tubes were connected to the bottom and the top of the tank as seen in Figure 4.18. In order to control the water flow rate and with that the outlet temperature from the thermosyphon heating system (max. 80°C), a round disk with an ID 6 mm orifice was mounted inside the upper part of the tube. Figure 4.18 The modified 300 litre single-shell hot water tank. Sight-glass Electric heater 85PDF 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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