Air enters a compressor steadily at the ambient conditions of 100kPa and 20 degrees celcius and leaves at 900 kPa. Heat is lost from the compressor in the amount of 150kJ/kg and the air experiences an entropy decrease of 0.50kJ/kg*K. Using constant specific heats, determine
(a) air exit temperature,
(b) work input to the compressor, and
(c) entropy generation during the process.

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]