vapopr 1x.6.2: An evaporator operating at atmospheric pressure (101.325 kPa) is fed at the rate of 10000 kgh of weak liquor containing 4 % caustic soda. Thick liquor leaving the evaporator contains 25% caustic soda Find the capacity of the evaporator.

10.33 Saturated steam at 0.2 bar condenses with a convec- tion coefficient of 6000 W/m²2 · K on the outside of a brass tube having inner and outer diameters of 16 and 19 mm, respectively. The convection coefficient for water flowing inside the tube is 5000 W/m². K. Esti- mate the steam condensation rate per unit length of the tube when the mean water temperature is 30°C.

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

Heat Transfer Question

9. SOC high crude oil is to be heated from 15° C to 55° C at the rate of 1,50 ton/h using a stream from the plant. The crude oil is pumped in to the tube and the heating stream is pumped into the shell side of an available heat exchanger. The heating stream enters in to the tube at 150° C and leaves the tube at 110° C. The average properties of both the fluids are given below. The available heat exchanger (1-2 pass) has shell diameter of 23% in. The shell has 324 tubes, ¾ in. OD, BWG 14 (wall thickness), 12 feet long arranged on 1 in. Square pitch and supported by baffles with a 25% cut, spaced at 9 in interval. You need to find the suitability of this exchanger for the purpose. What will be the allowable fouling factor? Heating stream Crude oil cp, J/g. ° C 2.2 2 H, CP 5.2 2.9 P, kg/m3 k, W/m. C 866 822 0.12 0.138

10.5-2. Minimum Gas Rate and Height of Water-Cooling Tower. It is planned to cool water from 110°F to 85°F in a packed countercurrent water-cooling tower using entering air at 85°F with a wet bulb temperature of 75°F. The water flow is 2000 lb/h ft² and the air flow is 1400 lb air/h ft2. The overall mass-transfer coefficient is KG a = 6.90 lb mol/h · ſt³ · atm. (a) Calculate the minimum air rate that can be used. (b) Calculate the tower height needed if the air flow of 1400 lb air/h ft² is used. .