A direct-transfer intercooler for a gas turbine is to be designed using either surface 8.0-iT or surface 9.29-0.737-SR. The requirements are:
The heat exchanger can be the necessary width, but the air inlet side must be 1.5 ft X 4 ft. Water flows through the tubes. Select the better surface based on economy of operation by calculating (a) the heat-exchanger width required for both surfaces and (b) the pressure drop (air side) for both designs. If electricity is 7¢/kWh and the fan is 53 percent efficient, what are the operating costs for 2,000 hr/year operation?