I want the detailed solution to understand a question Ls×2AExample 2. A 2940 kg of solid is to be dried from 1 kg water/kg dry solids to 0.01 kg water/kgdry solids in a tray dryer consisting of 24.5 m² and 0.02 m deep which completely filled withTwet material. The mean air temperature is 350 K and the relative humidity across the trays mayRHиbe taken as constant at 10%. The mean air velocity is 2.0 m/s, air density 0.95 kg/m³ and theconvective coefficient of heat transfer is given by:(h)h = 14.3G0.8; kW/m²K → 143 × (0.095 x 2 ) 8where G is the mass velocity of the air in kg/m²s. The critical moisture contents of the solid are< 0.3 kg water/kg dry solids. what is the drying time? Take λ=2395 kJ/kg.ItotalChapter FiveRcR₁ = h (T-Tw)Solution:SG = Pair XU = 0.95 x 2 = 1.9kgm².seckWm². Kh = 14.3G0.8 = 14.3(1.9) 0.8 = 23.9From Figure 1; at T=350 K and RH%-10%Rc(T-Tw)λTw = 317 K23.9(350-317)= 0.3282395kgwaterkgsolid.m².sectTotal =ARC2940tTotal1x [(×₁ = Xc) + Xc In XX|(1 − 0.3) + 0.3 In24.5 x 0.3280.30.01tTotal = 630 secPage 51

In the intricate domain of process engineering, the determination of drying times for solid…

Answered: Ls ×2 A Example 2. A 2940 kg of solid…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

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QUESTION 2 Airflow of 4.5 ms at 1 atm, 10°C, and B0% relative humidty is conditioned to 25C and 50% relative humidity through heating and then injoction of saturatod water vapor100'C. What is the flow rate of water vapor added to air? (in kois) (Choloes: 0.0001, 0.0182. 0.0222. 0.0318, 0.0424) What is the heating power of eloctricty? (n ku) (Choices: 58.8, 70.1, 877, 116.9, 168.1) What is the relative humidity after the heating section? (n %) (Choices: 18.5, 32.2, 27.0, 20.1, 38.5)
The atmosphere within a room is 21OC dry bulb temperature, 50% relative humidity and 1 atmosphere pressure. The inside surface temperature of the window glass is 4.4OC. Will moisture condense upon the window glass?
The first step in producing a cinnamon glazed coconut chips is placing the coconut meat in a P&S dryer. Supposed that the dryer processes 7,777.77 kg of desiccated coconut per hr. The coconut meat are to be dried from an initial moisture content of 20% at 21C to a final moisture content of 1.5 % at 38C. Air enters the dryer at 20% relative humidity and dry bulb temperature of 71C. The barometer reading is at 89.6 kPa. If the specific heat capacity of the coconut meat is 0.754 kJ/ kg-K' and the density of the coconut meat from the shearing and washing section as determined from the pilot testing is 1.520 kg/m3 . Calculate : (A) mass of the water evaporated, (B) total heating requirement of the system. During the calculation of your heating duty, you will notice that there are negative values of heat. Use the negative values of heat and account the min the calculation of your heating duty.
From an open water surface with air temperature 22°C, relative humidity is 40% and wind speed is 3 m/s, all measured at height 2 m above the water surface. Assume a roughness height of 0.03 cm. The net radiation is 200 W/m^2. Cp = 1005 J/kg-K A. Calculate the latent heat of vaporization (J/kg) B. Calculate the evaporation using Energy Balance Method (mm/day) C. Calculate the saturation deficit of the vapor pressure (Pa) D. Calculate the evaporation using Priestley-Taylor Method (mm/day)
At an altitude of 1,600m, the atmospheric pressure is 81.49kPa. What is the specifichumidity and relative humidity at this altitude when the dry and wet bulb temperaturesare measured to be 10ºC and 5ºC respectively? Note, due to the low atmosphericpressure at 1,600m, the 1atm psychrometric chart is not valid for this problem. You willreceive no points if you use it
Air at dry bulb temperature of 26 Celsius and a RH of 85% is heated to a dry bulb temperature at 100 Celsius . The dryer contains 2300 kg of coconut with an initial moisture content of 67% wet basis. If the average moisture content of the product is 15% wet basis, after drying for 7 hour, with the air flow rate of 1739kg/hr., determine the exit air temperature and relative humidity, and heat requirement in kW. (B). A parallel-flow heat exchanger is used to cool milk (C=3.845 J/Kg. 0C) entering at 110 Celsius. The flow rate of milk is 1.5 kg/s. Cold water (C=4.178 KJ/ kg 0C) enters at 22 Celsius with a flow rate of 3.0 kg/s and exits at 45 0C. The overall heat transfer coefficient is known to be 300 W/m2.0 Calculate (a). The exit temperature of milk(c). Draw the temperature profile of above heat exchanger(b). The heat transfer surface area required
Moist air (2.5 m3/s) at 35 °C and 70% relative humidity, passing through an evaporator of a refrigeration system and cooling to 20 °C. Calculate the rate of water removing from the air (g water/s)?
A moist air sample has dry bulb temperature of 30°C and specific humidity of 11.5 g water vapour per kg dry air Assume molecular weight of air as 28.93 . If the saturation vapour pressure of water at 30°C is 4.24 kPa and the total pressure is 90 kPa, then the relative humidity (in %) of air sample is, (a) 50.5 (b) 38.5 (c) 56.5 (d) 68.5
Humid air at constant 101 kPa pressure, 30°C temperature and 40% relative humidity undergoes an isobaric cooling process unitl its temperature reaches 22°C. Calculate how much energy by heat is transferred from the air stream in kJ per kg of dry air. Give you answer to two significant figures and enter the numerical value only (eg. 0.0123, 0.123., 123, 1230, but not 0.0123 kJ/KGDA). 3
The dry-bulb temperature and wet-bulb temperature of a sample of air are 23°C and 18°C, respectively. The pressure of the air is 97 kPa. If the air was adiabatically saturated: -Calculate the humidity ratio in kg of vapor per kg of dry air.-What is its degree of saturation in %?
consider a room filled with air at 15 degrees centigrade and relative humidity 75 percent,calculate the temperature of the windows of the room at which air starts condensing at inner surface?
Moist air at 35°C and 55% relative humidity is heated using a common furnace to 70°C. From the psychrometric chart, determine how much heat is added per m 3 initial moist air and what the final dew-point temperature is.

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