Heating Water with Hot Gases and Heat-Transfer Area. A water flow rate of 13.85 kg/s is to be heated from 54.5 to 87.8°C in a heat exchanger by 54430 kg/h of hot gas flowing counterflow and entering at 427°C (Cpm = 1.005 kJ/kg · K). The overall U¸ = 69.1 W/m²K. Calculate the exit-gas tem- perature and the heat-transfer area. = Ans. T T = 299.5°C

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