One easy way to improve the efficiency of a furnace is to let the exhaust gasses from the combustion products preheat the incoming air that will be used in the furnace for combustion. This can be accomplished by incorporating a cross-flow heat exchanger into the system. In this problem Air at 27 °C and 100 kPa enters a heat exchanger at a volumetric flow rate of 0.75 m3/s. The combustion gases from the furnace consist of mostly CO2 and H2O. However, for this problem let's assume that the CO2 is being captured prior to the heat exchanger and all that is left to heat the air at the entrance of the heat exchanger is H2O at 250 °C and 200 kPa. If the flow rate of the combustion gas is 0.9 kg/s and the temperature is cooled down to 150 °C at the exit of the heat exchanger with no drop in pressure, what is the rate of heat transfer to the air from the combustion products in kW? What air temperature would result at the exit of the heat exchanger?