A coal-fired power plant releases SO2 at a rate of 1500 g/s. The wind speed at the top of the stack is 4 m/s. Calculate the SO2 concentration at a point 4 km down wind and 0.2 km perpendicular to the plume centerline from the stack under overcast condition. Assuming the atmosphere stability is class D. Stack parameters: Atmosphere conditions: Height = 100.0 m Pressure = 95.0 kPa Diameter = 1.2 m Temperature = 25.0 oC Exit velocity = 8 m/s Temperature = 315 oC For class D stability, sy = ax0.894, a = 68; sz = cxd + f, c = 44.5, d = 0.516, f = -13

Amass of m 1.5 kg of steam is contained in a closed rigid container. initially the pressure and temperature of the steam are: p 1.5 mpa and t 240°c (superheated state), respectively. then the temperature drops to t2= 100°c as the result of heat transfer to the surroundings. determine: a) quality of the steam at the end of the process, b) heat transfer with the surroundings. for: p1.5 mpa and t 240°c: enthalpy of superheated vapour is 2900 kj/kg, specific volume of superheated vapour is 0. 1483 m/kg, while for t 100°c: enthalpy of saturated liquid water is 419kj/kg, specific volume of saturated liquid water is 0.001043m/kg, enthalpy of saturated vapour is 2676 kj/kg, specific volume of saturated vapour is 1.672 m/kg and pressure is 0.1 mpa.

What difference(s) did you notice using a pneumatic circuit over hydraulic circuit.explain why the pneumatic piston stumbles when it hits an obstacle.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.