Water is used to cool ethylene glycol in a 60-ft-long double pipe heat exchanger made of 4-std and 2-std (both type m) copper tubing. the water inlet temperature is 60°f and the ethylene glycol inlet temperature is 180°f. the flow rate of the ethylene glycol is 20 lb m/s, while that for the water is 30 lb m/s. calculate the expected outlet temperature of the ethylene glycol and determine the pressure drop expected for both streams. assume counterflow, and place the ethylene glycol in the inner tube. compose a summary of performance chart.

An external consultant recommends that a plant installs a bank of capacitors for power factor correction. this will reduce the peak electrical demand charges by an average of 93 kw every month. the plant current pays $13 per kw in peak demand charges. the capacitor bank will include 223 kw of fixed capacitors, and 183 of variable capacitors. the fixed capacitors cost $59 per kw, and the variable capacitors will cost $65 per kw. the consultant charges 21% of the equipment costs to install the capacitors. because this project will reduce the demand for the electric utility, they are prepared to provide a one-time rebate of $42 per kw of reduced demand. what is the simple payback period for this project (in years)?