“Don’t be ashamed to weep; ’tis right to grieve. Tears are only water, and flowers, trees, and fruit cannot grow without water. But there must be sunlight also. A wounded heart will heal in time, and when it does, the memory and love of our lost ones is sealed inside to comfort us.”

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]