Outdoor air (cp = 1.005 kJ/kg €¢ °C) is to be preheated by hot exhaust gases in a cross-flow heat exchanger before it enters the furnace. Air enters the heat exchanger at 95 kPa and 20°C at a rate of 0.8 m3/s. The combustion gases (cp = 1.10 kJ/kg €¢ °C) enter at 180°C at a rate of 1.1 kg/s and leave at 95°C. Determine the rate of heat transfer to the air and the rate of energy destruction in the heat exchanger.

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Air 95 kPa 20°C 08 mis Exhaust gases 1.1 kg/s 95°C