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Cold air at 20F, 760 mm Hg pressure, and 70% relative

Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder ISBN: 9780471687573 143

Solution for problem 8.79 Chapter 8

Elementary Principles of Chemical Processes | 3rd Edition

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Elementary Principles of Chemical Processes | 3rd Edition | ISBN: 9780471687573 | Authors: Richard M Felder

Elementary Principles of Chemical Processes | 3rd Edition

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Problem 8.79

Cold air at 20F, 760 mm Hg pressure, and 70% relative humidity is conditioned by being passed through a bank of heating coils, then through a water spray, and finally through a second set of heating coils. In passing through the first coil bank, the air is heated to 75F. The temperature of the water supplied to the spray chamber is adjusted to the wet-bulb temperature of the air admitted to the chamber, so that the humidifying unit may be assumed to operate adiabatically. It is required that the air emerging from the conditioning unit be at 70F and 35 % relative humidity. Use Figure 8.4-2 to solve the following problems. (a) Calculate the temperature of the water supplied to the spray chamber and the relative humidity and dry-bulb temperature of the air leaving the spray chamber. (b) Calculate the mass of water evaporated (Ibm) per cubic foot of air fed to the conditioning unit. (c) Calculate the required heat transfer rates (Btu/ft3 entering air) in each of the heating coil banks. (d) Sketch a psychrometric chart and show the path followed by the air in each of the three steps of this process

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Chapter 8, Problem 8.79 is Solved
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Textbook: Elementary Principles of Chemical Processes
Edition: 3
Author: Richard M Felder
ISBN: 9780471687573

The answer to “Cold air at 20F, 760 mm Hg pressure, and 70% relative humidity is conditioned by being passed through a bank of heating coils, then through a water spray, and finally through a second set of heating coils. In passing through the first coil bank, the air is heated to 75F. The temperature of the water supplied to the spray chamber is adjusted to the wet-bulb temperature of the air admitted to the chamber, so that the humidifying unit may be assumed to operate adiabatically. It is required that the air emerging from the conditioning unit be at 70F and 35 % relative humidity. Use Figure 8.4-2 to solve the following problems. (a) Calculate the temperature of the water supplied to the spray chamber and the relative humidity and dry-bulb temperature of the air leaving the spray chamber. (b) Calculate the mass of water evaporated (Ibm) per cubic foot of air fed to the conditioning unit. (c) Calculate the required heat transfer rates (Btu/ft3 entering air) in each of the heating coil banks. (d) Sketch a psychrometric chart and show the path followed by the air in each of the three steps of this process” is broken down into a number of easy to follow steps, and 194 words. Elementary Principles of Chemical Processes was written by and is associated to the ISBN: 9780471687573. This textbook survival guide was created for the textbook: Elementary Principles of Chemical Processes, edition: 3. Since the solution to 8.79 from 8 chapter was answered, more than 276 students have viewed the full step-by-step answer. This full solution covers the following key subjects: air, chamber, Water, temperature, spray. This expansive textbook survival guide covers 13 chapters, and 710 solutions. The full step-by-step solution to problem: 8.79 from chapter: 8 was answered by , our top Chemistry solution expert on 11/15/17, 02:42PM.

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Cold air at 20F, 760 mm Hg pressure, and 70% relative