The air supply for a drier has dry bulb temperature of 25°C and a wet – bulb temperature of 17.5°C. It is heated to 85°C by heating coils and introduced into the drier. In the drier, it cools along the adiabatic cooling line and leaves the drier fully saturated.(i) What is its humidity?(ii) What is the dew point of the initial air?(iii) How much water will be evaporated per 100 cubic meter of entering air?(iv) How much heat is needed to heat 100 cubic meter air to 85°C?(v) At what temperature does the air leave the drier? 1.4-280то.15780002606000f0.1450001.3-240· Enthalpy of satd. air0.134000Adiabatic saturation curve220Enthalpy of dry air+0.1230001.2-200- Saturated humid volume0.112000---Specific volume of dry air1800.101.1-1600.0910001400.08800600|I1.0-1200.07500 E100-4000.063000.05600.042000.8-400.03 I20-0.020.7-0-0.010 5 10 15 20 25 30 35 40 45 50 55 60 65Temperature, °C70 75 80 85 90 95 100 105 115Psychrometric chart for air-water system at 760 mm Hg pressure.V= humid volume, m'/kg dry airH = enthalpy kJ/kg dry airY = absolute humidty, kg water vapour / kg dry airH = enthalpy kJ / kg dry air

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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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Question

The air supply for a drier has dry bulb temperature of 25°C and a wet – bulb temperature of 17.5°C. It is heated to 85°C by heating coils and introduced into the drier. In the drier, it cools along the adiabatic cooling line and leaves the drier fully saturated.
(i) What is its humidity?
(ii) What is the dew point of the initial air?
(iii) How much water will be evaporated per 100 cubic meter of entering air?
(iv) How much heat is needed to heat 100 cubic meter air to 85°C?
(v) At what temperature does the air leave the drier?

1.4-
280
то.15
78000
260
6000
f0.14
5000
1.3-
240
· Enthalpy of satd. air
0.13
4000
Adiabatic saturation curve
220
Enthalpy of dry air
+0.12
3000
1.2-
200
- Saturated humid volume
0.11
2000
---Specific volume of dry air
180
0.10
1.1-
160
0.09
1000
140
0.08
800
600|I
1.0-
120
0.07
500 E
100-
400
0.06
300
0.05
60
0.04
200
0.8-
40
0.03 I
20-
0.02
0.7-
0-
0.01
0 5 10 15 20 25 30 35 40 45 50 55 60 65
Temperature, °C
70 75 80 85 90 95 100 105 115
Psychrometric chart for air-water system at 760 mm Hg pressure.
V= humid volume, m'/kg dry air
H = enthalpy kJ/kg dry air
Y = absolute humidty, kg water vapour / kg dry air
H = enthalpy kJ / kg dry air

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