On a clear summer afternoon with a wind speed of 3.20 m/s at 10 m, the particulate concentration was found to be 1,520 μg/m3 at a point 2 km downwind and 0.5 km perpen- dicular to the plume centerline from a coal-fired power plant in a rural area. if the effective stack height is 95 m, determine the particulate emission rate of the power plant. use the graphical method to calculate sy and sz.

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]