Air at 30°C Dry-bulb temperature, 40% RH enters a heating chamber at the rate of 500 cmh (cu.m/hr). The air undergoes constant temperature heating and leaves the chamber with an RH of 70%. (a.) At standard atmospheric condition, find the heat added (in kW) and the amount water added (in kg/min). (b.) Solve part (a) if the total pressure of the air is 80 kPaa.
Air at 30°C Dry-bulb temperature, 40% RH enters a heating chamber at the rate of 500 cmh (cu.m/hr). The air undergoes constant temperature heating and leaves the chamber with an RH of 70%. (a.) At standard atmospheric condition, find the heat added (in kW) and the amount water added (in kg/min). (b.) Solve part (a) if the total pressure of the air is 80 kPaa.
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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Question
Solve part B only.
Transcribed Image Text:8:53 1
Qadd
Qadd
h1
mw
mw
= mair *(h₂ – h₁₂)
mw
Using Psychrometric chart,
at T₁ = 30°C and 1 = 40%,
h₁ 57.27 kJ/kg
w₁ = 0.0106 kg/kg of dry air
V₁ = 0.873 m³/kg
at T₂ = 30°C and 2 = 70%
h₂ = 78.22 kJ / kg
W₂ = 0.0188 kg/kg of dry air
The mass flow rate of air is given by,
V₁
500
mair =
572. 73768 kg/hr
V1
0.873
Therefore, the heat added during the process
572.73768
3600
Qa = 3.333 kW
add
The amount of water added,
= mair *(W2 - W₁)
*(78.22 - 57.27)
572.73768
60
30 C
*(0.0188 -0.0106)
= 0.078274 kg / min
?
70%
40%
v1
W2
w1
DO
8
Transcribed Image Text:Air at 30°C Dry-bulb temperature, 40% RH enters a heating chamber
at the rate of 500 cmh (cu.m/hr). The air undergoes constant
temperature heating and leaves the chamber with an RH of 70%. (a.)
At standard atmospheric condition, find the heat added (in kW) and
the amount water added (in kg/min). (b.) Solve part (a) if the total
pressure of the air is 80 kPaa.
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