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Plot the dew point temperature, humid volume, and wet-bulb temperature for each one

Plot the dew point temperature, humid volume, and wet-bulb temperature for each one

Introduction to Chemical Engineering Thermodynamics
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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Plot the dew point temperature, humid volume, and wet-bulb temperature for each one.  

||! PD Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + ✪ File 72°F Partly cloudy Draw E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf (T) Read aloud Fina chart J Curves on the psychrometric/chart correspond to specified values of (106%, 90%.)80%) etc.). The curve that forms the left boundary(of the chart corresponds to (100% relative humidity and is known as the saturation curve. 452 of 695 • Dew point, Tap the temperature at which humid air becomes saturated if it is cooled at constant pressure. rm20/₂OVT The dew point of humid air at a given point on the psychrometric chart can easily be determined. For example, locate the point on Figure 8.4-1 corresponding to air at 29°℃ and 20% relative humidity. Cooling this air at constant pressure (= 1 atm) corresponds to moving horizontally (at constant absolute humidity) to the saturation curve. Tap is the temperature at the intersection, or 4°C. (Verify this statement.) ● Humid volume, Ví (m³/kg DA). The humid volume is the volume occupied by 1 kg of dry air plus the water vapor that accompanies it. Lines of constant humid volume on the psychrometric chart are steep and have negative slopes. On Figure 8.4-1, humid-volume lines are shown corresponding to 0.75, 0.80, 0.85, and 0.90 m³/kg dry air. To determine the volume of a given mass of wet air using the psychrometric chart, you must first determine the corresponding mass of dry air from the absolute humidity, then multiply this mass by Vн. Suppose, for example, you wish to know the volume occupied by 150 kg of humid air at T = 30°C and h₁ = 30%. From Figure 8.4-1, ha = 0.0080 kg H₂O(v)/kg DA and VH≈ 0.87 m³/kg DA. The volume may then be calculated as V = Q Search 150 kg humid air 1.00 kg DA 1.008 kg humid air 0.87 m³ = 129 m³ kg DA (In this calculation, we used the fact that if the absolute humidity is 0.008 kg H₂O/kg DA, then 1 kg DA is accompanied by 0.008 kg water for a total of 1.008 kg humid air.) {" 10 @ 33 ENG Sign in 00 : 9:32 PM 5/28/2023
Transcribed Image Text:||! PD Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + ✪ File 72°F Partly cloudy Draw E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf (T) Read aloud Fina chart J Curves on the psychrometric/chart correspond to specified values of (106%, 90%.)80%) etc.). The curve that forms the left boundary(of the chart corresponds to (100% relative humidity and is known as the saturation curve. 452 of 695 • Dew point, Tap the temperature at which humid air becomes saturated if it is cooled at constant pressure. rm20/₂OVT The dew point of humid air at a given point on the psychrometric chart can easily be determined. For example, locate the point on Figure 8.4-1 corresponding to air at 29°℃ and 20% relative humidity. Cooling this air at constant pressure (= 1 atm) corresponds to moving horizontally (at constant absolute humidity) to the saturation curve. Tap is the temperature at the intersection, or 4°C. (Verify this statement.) ● Humid volume, Ví (m³/kg DA). The humid volume is the volume occupied by 1 kg of dry air plus the water vapor that accompanies it. Lines of constant humid volume on the psychrometric chart are steep and have negative slopes. On Figure 8.4-1, humid-volume lines are shown corresponding to 0.75, 0.80, 0.85, and 0.90 m³/kg dry air. To determine the volume of a given mass of wet air using the psychrometric chart, you must first determine the corresponding mass of dry air from the absolute humidity, then multiply this mass by Vн. Suppose, for example, you wish to know the volume occupied by 150 kg of humid air at T = 30°C and h₁ = 30%. From Figure 8.4-1, ha = 0.0080 kg H₂O(v)/kg DA and VH≈ 0.87 m³/kg DA. The volume may then be calculated as V = Q Search 150 kg humid air 1.00 kg DA 1.008 kg humid air 0.87 m³ = 129 m³ kg DA (In this calculation, we used the fact that if the absolute humidity is 0.008 kg H₂O/kg DA, then 1 kg DA is accompanied by 0.008 kg water for a total of 1.008 kg humid air.) {" 10 @ 33 ENG Sign in 00 : 9:32 PM 5/28/2023
||! PD Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + ✪ File 72°F Partly cloudy Draw E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf T Read aloud plot the wet-bulb teme. Q Search 455 of 695 Humid air (D Thermometer Thermometer bulb wrapped with moist wick The wet-bulb temperature of humid air depends on both the dry-bulb temperature and the moisture content of the air. If the air is saturated (100% relative humidity), no water evaporates from the wick, and the wet-bulb and dry-bulb temperatures are the same. The lower the humidity, the greater the difference between the two temperatures. The humid air conditions that correspond to a given wet-bulb temperature fall on a straight line on the psychrometric chart, called a constant wet-bulb temperature line. The constant wet-bulb temperature lines for air-water at 1 atm appear on Figures 8.4-1 and 8.4-2 as lines with negative slopes extending beyond the saturation curve that are less steep than the lines of constant humid volume. The value of Twb corresponding to a given line can be read at the intersection of the line with the saturation curve. →→→For example, suppose you wish to determine the wet-bulb temperature of air at 30°C (dry bulb) with a relative humidity of 30%. Locate the point on Figure 8.4-1 at the intersection of the vertical line corresponding to T = 30°℃ and the curve corresponding to hr = 30%. The diagonal line through the point is the constant wet-bulb temperature line for air at the given condition. Follow that line upward to the left until you reach the saturation curve. The temperature value you read on the curve (or vertically down from it on the abscissa) is the wet-bulb temperature of the air. You should get a value of 18°C. This means that if you wrap a wet wick around a thermometer bulb and blow air with T = 30°C and hr = 30% past the bulb, the thermometer reading will drop and eventually stabilize at 18°C. Ⓡ 33 ENG Sign in 00 : 9:34 PM 5/28/2023
Transcribed Image Text:||! PD Elementary Principles of Chemica X PDF *Elementary Principles of Chemic X + ✪ File 72°F Partly cloudy Draw E:/Elementary%20Principles%20of%20Chemical%20Processes,%204th%20Edition%20(%20PDFDrive%20).pdf T Read aloud plot the wet-bulb teme. Q Search 455 of 695 Humid air (D Thermometer Thermometer bulb wrapped with moist wick The wet-bulb temperature of humid air depends on both the dry-bulb temperature and the moisture content of the air. If the air is saturated (100% relative humidity), no water evaporates from the wick, and the wet-bulb and dry-bulb temperatures are the same. The lower the humidity, the greater the difference between the two temperatures. The humid air conditions that correspond to a given wet-bulb temperature fall on a straight line on the psychrometric chart, called a constant wet-bulb temperature line. The constant wet-bulb temperature lines for air-water at 1 atm appear on Figures 8.4-1 and 8.4-2 as lines with negative slopes extending beyond the saturation curve that are less steep than the lines of constant humid volume. The value of Twb corresponding to a given line can be read at the intersection of the line with the saturation curve. →→→For example, suppose you wish to determine the wet-bulb temperature of air at 30°C (dry bulb) with a relative humidity of 30%. Locate the point on Figure 8.4-1 at the intersection of the vertical line corresponding to T = 30°℃ and the curve corresponding to hr = 30%. The diagonal line through the point is the constant wet-bulb temperature line for air at the given condition. Follow that line upward to the left until you reach the saturation curve. The temperature value you read on the curve (or vertically down from it on the abscissa) is the wet-bulb temperature of the air. You should get a value of 18°C. This means that if you wrap a wet wick around a thermometer bulb and blow air with T = 30°C and hr = 30% past the bulb, the thermometer reading will drop and eventually stabilize at 18°C. Ⓡ 33 ENG Sign in 00 : 9:34 PM 5/28/2023
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