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6 – Modelling After a period of 12 hours, the maximum deviation between the measured and simulated temperatures was less than 0.6 K. When taking into account the uncertainty in the temperature measurements and the placement of the temperature sensors, the tank model proved satisfactorily accuracy when calculating transient static thermoclines in cylindrical DHW tanks. 6.2.3 Simulation Results 6.2.3.1 The Static Thermoclines Figure 6.22 shows the simulated static thermoclines between the hot and the cold water reservoirs in the DHW tank during a period of 12 hours. The initial water temperatures were 70 and 10oC, the ambient air tempera- ture was 20oC, whereas the U-value for the tank wall was 1.05 W/(m2K). 40 30 20 10 0 -10 -20 -30 -40 8h 2h Start Start 1h 4h 12 h 5 15 25 35 45 55 65 75 Temperature [°C] Figure 6.22 The simulated thermocline in the 200 litre DHW tank at 70oC and 10oC initial temperatures. The ambient air temperature was 20oC, and the U-value was 1.05 W/(m2K). 199 Vertical Position [cm]PDF 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
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