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 54 430 kg/h of hot gas flowing counterflow and entering...

Extracted text: 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 54 430 kg/h of hot gas flowing counterflow and entering at 427°C (cpm 1.005 kJ/kg · K). The overall U, = 69.1 W/m² · K. Calculate the exit-gas tem- perature and the heat-transfer area. Ans. T = 299.5°C