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3 – Theoretical Background and System Analysis 0.025 0.020 0.015 0.010 0.005 0.000 90 80 70 60 50 40 30 20 10 0 60oC 70oC 80oC 90oC 012345 Heating Capacity [kW] Figure 3.19 The relationship between the total heating capacity of the DHW gas cooler units and the water flow rate at different DHW temperatures. The inlet water temperature is 10oC. At equal heat loads, the mass flow rate in a floor heating system with 5 K temperature difference between the supply and return line will be roughly 10 to 15 times higher than that of the DHW system. 3.3.2 Operating Modes The DHW system will be operating in three different modes: ♦ Tapping mode ♦ Charging (heating) mode ♦ Reheating mode 3.3.2.1 The Tapping Mode Figure 3.20 shows the principle of the DHW system during the tapping mode. DHW at typically 60 to 85oC (TS) is drained from the top of the & distributed to the tapping site(s) and finally mixed with city water to reach the desired tapping temperature TT. City water at typically 5 to 20oC (TCW) & flow mGCis heated to the set-point temperature TS. tank at a flow rate m , premixed with city water to avoid risk of scolding, S is supplied at a flow rate mCW at the bottom of the tank. The CO2 heat pump unit is operative during the tapping mode, and the relatively small water & 51 Water Flow Rate [kg/s] Water Flow Rate [litres/h]PDF Image | Residential CO2 Heat Pump System for Combined
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