Moist air (2.27 mol% H2O) at 25°C and 100 kPa is to be dehumidified sothat during its passage through za large cold room used for storage excess,ice formation can be avoided on the chilling coils in the room.MoistDehumidifiedPROCESSairairTwosuggestions have been offered:(1) Cooling the moist air at constant pressure(2) Compressing the moist air at constant temperature1. If 60% of the initial water in the entering moist air is to be condensedout, to what temperature should the air in process (1) be cooled?2. What pressure should the moist air in process (2) reach for the same percent removal of water (60%)?CondensedwaterAdditional information:Вlog 10 Psat [mm Hg] = A –ComponentMWAВT[°C] + CWater188.140191810.94244.485

The mole fraction of water in the air is calculated. The total pressure is calculated. In process…

Answered: Moist air (2.27 mol % H2O) at 25°C and…

Introduction to Chemical Engineering Thermodynamics

8th Edition

ISBN:9781259696527

Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart

Chapter1: Introduction

Section: Chapter Questions

Problem 1.1P

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Air at 18°C (cp = 1006 J/kg·K) is to be heated to 58°C by hot oil at 80°C (cp = 2150 J/kg·K) in a cross-flow heat exchanger with air mixed and oil unmixed. The product of heat transfer surface area and the overall heat transfer coefficient is 750 W/K and the mass flow rate of air is twice that of oil. Determine (a) the effectiveness of the heat exchanger, (b) the mass flow rate of air, and (c) the rate of heat transfer.
Q2: An Aluminum pot is used to boil water as shown below. The handle of the pot is 20-cm long, 3-cm wide, and 0.5-cm thick. The pot is exposed to room air at 25°C, and the convection coefficient is 5 W/m' °C. Can you touch the handle when the water is boiling? (k for aluminum is 237 W/m °C).We can model the pot handle as an extended surface. Assume that there is no heat transfer at the free end of the handle. If a stainless steel handle is used instead of aluminum, what will happen? For a stainless steel, the thermal conductivity k=15 W/m.°C. T 25 °C h 5 W/ m2 °C 100 °C
4. The right figure shows a simple combustion calorimeter. The sample is ignited electrically. After a few minutes the temperature of the water and calorimeter is constant at AT higher than the starting temperature. Determine the heat of combustion of a sample from the following data: Sample mass Calorimeter mass Water mass The heat of combustion Au combustion 4 g 500 g 5000 g Sample Cvealorimeter Cvwater AT - Stirrer Oxygen O Water is defined as Ufinal products of combustion initial fuel+oxygen msample Thermometer Heavy steel bomb 0.12 cal/g °C 1.0 cal/g °C 5 °C
Fruit juice at 25 ° Celsius contains 5% total solids concentrated via single effect evaporator. Evaporator operated vacuum at 80 ° Celsius evaporation temperature and 85% quality steam supplied at 169.06 kPa. The desired concentration of the final product is 40%. The total solids rate of the concentrated product leaving the evaporator is 2500 kg / hr. the specific heat of fruit juice is 4.05 KJ / (kg degrees Celsius) and concentrated products 3.175 KJ / (per kg degrees Celsius) Count a. The required vapor rate is = b. steam economy if the condensate temperature is released at 90 ° Celsius =
4.9-1. Mean Temperature Difference in an Exchanger. A 1-2 exchanger with one shell pass and two tube passes is used to heat a cold fluid from 37.8°C to 121.1°C by using a hot fluid entering at 315.6°C and leaving at 148.9°C. Calculate the A Tim and the mean temperature difference AT in K. Ans. A Tim 148.9 K; AT = 131.8 K
You oversee cooking a 30-lb turkey that is initially at 20 ̊C by exposing it to the 200 ̊C environment ofan oven with a convective heat transfer coefficient of 20 Wm-2 K-1 . Model the turkey as a cylinder withaspect-ratio of 1.0 (i.e., with equal length and diameter) and thermal properties that are close to those ofwater; k = 0.90 Wm-1K-1 ; cp = 4.2 kJkg-1 K-1 ; r = 1200 kgm-3 b. To be cooked, the temperature everywhere within the turkey must be raised to at least 90 ̊C. Howlong does it take for the center of the turkey to be cooked?c. Determine the surface temperature of the turkey when its center is first cooked.
Apple juice is being concentrated in a natural circulation single effect evaporator. At steady state conditions, dilute juice is the feed introduced at a rate of 7 kg/s. The concentration of the dilute juice is 10% total solids. The juice is concentrated to 50% total solids. Steam is available at 205 kPa and evaporation takes place at 13.5 kPa. The specific heat of dilute apple juice is 3.76 kJ/kg. The inlet feed temperature is 21oC and the condensate leaves the heating space at 79.7oC . The overall heat transfer coefficient is assumed to be 3000 W/m2K. Assume negligible boiling point elevation. Calculate:a) mass flow rate of concentrated productb) steam requirementsc) steam economyd) heat transfer area
The plot to the right shows the 1-D steady-state solution to the Pennes bioheat equation with T = 37°C at x = 0 (body core) and T = 43°C at x = 0.01 (body surface). The thermal conductivity is 0.5 W m-l °C-'. This scenario describes some surface tissue thermal conductivity (WI(m°C)) 0.5 blood perfusion rate (1/5) T("C) 43 heating (e.g., laser). Which trace represents the highest value of the blood perfusion rate. 42 41 A 40 А. А В. В 39 38 E С.С 0.002 X(m) 0.010 0.004 0.006 0.008 D. D Е. Е
05: Acetylene gas (C₂H₂) at 25 °C is burned during a steady-flow combustion process with 30 percent excess air at 27 °C. It is observed that 75x10³ kJ of heat is being lost from the combustion chamber to the surroundings per kmol of acetylene. Assuming combustion is complete, determine the exit temperature of the product gases.
Q2
The figure is shown here included in the question
Why does the temperature remains the same at 0°C from1-3minutes ,event hough energy is being added the entire time?

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