4. Air, originally at 14°C with 7 g water/kg of dry air, is heated to 48°C and then passed over a shelf in a tray drier and the air is saturated to 80% relative humidity. Then, air is reheated to 48°C by heaters and send to pass over a second shelf and the air is saturated to 70% relative humidity. Drying on each shelf occurs adiabatically. Determine a) the temperature of the air at the end of each shelf b) the temperature of the material on each shelf c) the rate of removal of water (in kg/h) if 0.05 m³/h of moist air enters the drier.

4. Air, originally at 14°C with 7 g water/kg of dry air, is heated to 48°C and then passed over a shelf in a tray drier and the air is saturated to 80% relative humidity. Then, air is reheated to 48°C by heaters and send to pass over a second shelf and the air is saturated to 70% relative humidity. Drying on each shelf occurs adiabatically. Determine a) the temperature of the air at the end of each shelf b) the temperature of the material on each shelf c) the rate of removal of water (in kg/h) if 0.05 m³/h of moist air enters the drier.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Chemical and Phase Equilibrium

Phase diagrams or equilibrium phase diagrams are the graphical representations that show the phase transformations of the constituting elements with respect to the pressure, temperature, and compositions. The diagrams show the conditions that limit the different phases, namely solid, liquid, and gas. The diagram can also be utilized to verify the relations between the state variables. Most of the phase diagrams are temperature-pressure phase diagrams, with the variable parameter as the composition. Usually other variables such as solubility and pressure parameters are not indicated in the phase diagram. For a one-component system (unary phase diagram), the phase diagram is generally a function of temperature and pressure as the state variables, or temperature and volume. However, for a binary system (two-phase) having two components, the phase diagram is a function of temperature and composition as the state variables only. Coexisting of the different phases of the constituting elements is indicated in the phase diagram. A ternary phase diagram can be characterized by consisting of three phases in equilibrium.

Question

4. Air, originally at 14°C with 7 g water/kg of dry air, is heated to 48°C and then passed over a
shelf in a tray drier and the air is saturated to 80% relative humidity. Then, air is reheated to
48°C by heaters and send to pass over a second shelf and the air is saturated to 70% relative
humidity. Drying on each shelf occurs adiabatically. Determine
a) the temperature of the air at the end of each shelf
b) the temperature of the material on each shelf
c) the rate of removal of water (in kg/h) if 0.05 m³/h of moist air enters the drier.

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