On a clear summer afternoon with a wind speed of 3m/s (at 10m height), the SO2 concentration was found to be 1160g/m3 at a point 2km downwind and 0.5km perpendicular to the plume centerline from a coal fired thermal power plant. Given the following parameters and conditions, determine the capacity of the power plant in mega watt. Stack parameter: Height =70m; diameter =1m; exit velocity =10m/s, temperature =320C Atmospheric conditions: pressure =100kPa; Temperature =25C Sulphur content in coal =2% Calorific value of coal =8000kCal/kg Power plant overall efficiency (from thermal to electrical energy) =45% [12]