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Chemistry / Elementary Principles of Chemical Processes 3 / Chapter 8 / Problem 8.79

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

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

Chapter 8, Problem 8.79

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QUESTION:

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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QUESTION:

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

ANSWER:

Step 1 of 5

The diagram of the system is given below:

For inlet air (A):

Temperature of dry-bulb,

Relative humidity,

From the figure 8.4-2 we have,

For Outlet air (D):

Temperature of dry-bulb,

Relative humidity,

From the figure,

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