Air with 100% humidity is not pleasant, even at 68°F. Air with 50% humidity at 68°F can be produced by cooling some air below 68°F and then mixing with some hot, humid air at 95°F. This process is shown in the schematic below. air: air: 95°F 4 95°F 3.20 wt% water cold air: 3.20 wt% water, 100% humidity cooler 3 mixer air: 154.0 kg/min water 68°F 4.7 kg/min 0.72 wt% water (50% humidity) Calculate the flow rate of stream 4, the hot, humid air into the mixer.

only b

A food product with 85% moisture content is being frozen. Estimate the specific heat of the product at -10°C when 82% of the water is in a frozen state. The specific heat of dry product solid is 2.5 kJ/(kg °C). Assume specific heat of water at -10°C is similar to specifi c heat of water at 0°C. a. Cp frozen product = ... kJ/kg °C.

Estimate the heat of vaporization of diethyl either normal boiling point using troutons rule and Chen's rule and compare the results with a tabulated value of this quantity. Calculate the percentage error that results from using each estimation. The estimate the change in the heat of vaporization at 100°c using the Watson correlation.

Calculate the heat capacity for formaldehyde at 25°C. Answer should be in kJ/kgmol°C

Insulated Sample Burning outside dish sample chamber Steel bomb Combustion (bomb) calorimeter. In an experiment, a 0.6629 g sample of phthalic acid ( C8H604) is burned completely in a bomb calorimeter. The calorimeter is surrounded by 1.046 x 10³ g of water. During the combustion the temperature increases from 24.04 to 26.63 °C. The heat capacity of water is 4.184 J-g¹. C-¹. The heat capacity of the calorimeter was determined in a previous experiment to be 788.9 J. ˚C-¹. Assuming that no energy is lost to the surroundings, calculate the molar heat of combustion of phthalic acid based on these data. C8 H6 O4(s) + (15/2) O2(g) → 3H₂O(l) + 8CO2 (g) + Energy kJ/mol Molar Heat of Combustion =

For the following Psychometric chart, starting with a saturated air at a dry pulp temperature of 20oC, how much heat should be added to have saturated air at 40oC ?

3. In an adiabatic cooling tower 500 kg/min hot water, is to be cooled from 50°C to 35°C by using air with 25°C dry bulb temperature and 15°C wet bulb temperature. The air leaves the tower with 32°C dry bulb temperature and 85% relative humidity. a. Show the points of inlet and outlet air on the PSYCHROMETRIC chart given below. Read the followings: Absolute humidity and Relative humidity of the inlet air. Absolute humidity and wet bulb temperature of the exit air. b. Calculate the volumetric flow rate of the air used. c. Why do we use cooling towers in process plant?

Condensation of Steam on Vertical Tubes. Steam at 1 atm pressure abs and 100°C is condensing on a bank of five vertical tubes each 0.305 m high and having an OD of 25.4 mm. The tubes are arranged in a bundle spaced far enough apart so that they do not interfere with each other. The surface temper- ature of the tubes is 97.78°C. Calculate the average heat-transfer coefficient and the total kg condensate per hour. Ans. h = 15 240 W/m².K

Why does the  temperature remains the same at  0°C from1-3minutes ,event hough energy is being added the entire time?