The vapour pressure of water Pw in mm Hg at t°C is given by the equation 1668.21 log10 P = 7.96681 -- t + 228 A gaseous mixture at a total pressure of 1600 mm Hg and 100°C contains permanent gases and water vapour. The mole fraction of water vapour in the mixture is 0.12. The mixture is cooled at constant pressure. a) At what temperature will the first drops of condensed water appear? b) Using a basis of 100 kmol of initial mixture, how much water will be condensed when the temperature has reached 20°C?

The results of air temperature measurements obtained a dry bulb temperature of 50°C and a wet bulb temperature of 31°C. Using a Psychrometric chart, determine the properties of the air as follows: a. Air humidity = % b. Water content = kg water / kg air c. Specific volume = m3 / kg d. Enthalpy = kJ / kg e. Condensation temperature = °C If the air is in 162 m3 space, determine, f. Air weight (dry air and water vapor) = kg g. The amount of water content in the space = kg

Q1: A rotary countercurrent dryer is fed with ammonium nitrate containing 5% moisture at the rate of 1.5 kg/s, and discharges the nitrate with 0.2% moisture. The air enters at 405 K and leaves at 355 K; the humidity of the entering air being 0.007 kg moisture/kg dry air. The nitrate enters at 294 K and leaves at 339 K. Neglecting radiation losses, calculate the mass of dry air passing through the dryer and the humidity of the air leaving the dryer. Latent heat of water at 294 K = 2450 kJ/kg. Specific heat capacity of ammonium nitrate = 1.88 kJ/kg K. Specific heat capacity of dry air = 0.99 kJ/kg K. Specific heat capacity of water vapor = 2.01 kJ/kg K.

A fruit juice at 20°C with 5% total solids is being concentratedin a single-effect evaporator. The evaporator is being operatedat a suffi cient vacuum to allow the product moisture to evaporate at 80°C, and steam with 85% quality is being supplied at 169.06 kPa. The desired concentration of thefi nal product is 40% total solids. The concentrated productexits the evaporator at a rate of 3000kg/h. Calculate the(a) steam requirements and (b) steam economy for theprocess, when condensate is released at 90°C. The specifi cheat of liquid feed is 4.05kJ/(kg°C), and of concentratedproduct is 3.175kJ/(kg°C).   A single-effect evaporator is being used to concentrate10,000 kg/h of tomato juice from 5% total solids to 30% totalsolids. The juice enters the evaporator at 15°C. The evaporatoris operated with steam (80% quality) at 143.27 kPa. Thevacuum inside the evaporator allows the juice to boil at 75°C.Calculate (a) the steam requirements and (b) steam economyfor the process. Assume the…