1. Consider a 1000 MW power plant located in a rural area with 15 ton/day SO2 emissions from a 100 m high stack. The velocity and temperature of the stack gases lead to an effective stack height of 50 m above the physical stack. Estimate the ground level concentration as a function of distance downwind under the following conditions. a. The emissions are into a clear daytime atmosphere with wind (at 10 m) of 5 m/s. b. The emissions are into a clear nighttime atmosphere with wind (at 10 m) of 2 m/s. C. The conditions of a. except there is a strong elevated inversion at an altitude of 200 m.

2 A wire of diameter D = 2 mm and uniform temperature T has an electrical resistance of 0.01 N/m and a current flow of 20 A. (a) What is the rate at which heat is dissipated per unit length of wire? What is the heat dissipation per unit volume within the wire? (b) If the wire is not insulated and is in ambient air and large surroundings for which T = Tsur = 20°C, what is the temperature T of the wire? The wire has an emissivity of 0.3, and the coefficient associated with heat transfer by natural convection may be approximated by an expression of the form, h = C[(T-T)/D]¹/4, where C = 1.25 W/m7/4.K5/4 (c) If the wire is coated with plastic insulation of 2-mm thickness and a thermal conductivity of 0.25 W/m.K, what are the inner and outer surface temperatures of the insulation? The insulation has an emissivity of 0.9, and the convection coefficient is given by the expression of part (b). Explore the effect of the insu- lation thickness on the surface temperatures. Note: 1. The metal wire…

the pressure drop across the tube bank, and (c) the rate of condensation of steam inside the tubes. Evaluate the air properties at an assumed mean temperature of 35°C and 1 atm. Is this a good assumption?solve this part too

On a day when wind is blowing over a lake (T(water) =20°C) at 5 m/s, which side of the air-water interface will be rate-limiting on the flux of Ethyl benzene (i.e. va or vw)?

chemical engineering A power plant emits 216 g of SO2 every hour. The wind recorded on the same day is 5 m s-1, and the atmospheric stability class is A for the clear summer afternoon. There is no plume rise, and the stack height is 30 m. The values of σy and σz are 215 m and 450 m, respectively. Determine: the concentration of SO2 0.7 km downwind along the plume centreline at ground level.

The wall of a spherical steel tank k, = 17 m. K thick contains hot oil at 100°C. On the outside of the tank 10mm of spray W urethane insulation k, = 0.026 m. K of 1m in diameter and 100 mm h = 16. is added to stop the oil from cooling. If the outside temperature is 25°C, W m².K needs to be added to keep the tank at 100°C for pumping reasons? What are the overall heat transfer coefficients (Uo and Ui)? and h = 5 (₁ m². K how much heat