The following information is available for a company’s maintenance cost over the last seven months. Month Units Produced Maintenance Cost
June 90 $ 3,750
July 180 4,700
August 130 3,950
September 160 4,400
October 220 5,300
November 250 5,600
December 90 3,200

Using the high-low method, estimate both the fixed and variable components of its maintenance cost.

Athin walled concentric tube exchanger is used to cool engine oil from 160°c to 60°c with water that is available at 25°c acting as a coolant. the oil and water flow rates are each at 2 kg/s, and the diameter of the inner tube is 0.5 m and the corresponding value of the overall heat transfer coefficient is 250 w/m2. oc. how long must the heat exchanger be to accomplish the desired cooling? cpwater=4.187 kj/kg-candcpengine el=2.035 kj/kg·°c, oil . 120]