GATE ME 2015 Set 3 — Question 59
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Thermodynamics → Refrigeration & Air Conditioning → Psychrometric Chart & Moist Air
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Question
Air in a room is at and relative humidity (). The pressure in the room is . The saturation pressure of water at is . The humidity ratio of the air (in gram/kg of dry air) is ________.
Correct answer
21.7 to 21.9
Solution
Given:
Temperature
Relative humidity
Total pressure
Saturation pressure Step 1: Calculate partial pressure of water vapor ():Step 2: Calculate humidity ratio ():Step 3: Convert to g/kg of dry air:The humidity ratio is approximately .
Temperature
Relative humidity
Total pressure
Saturation pressure Step 1: Calculate partial pressure of water vapor ():Step 2: Calculate humidity ratio ():Step 3: Convert to g/kg of dry air:The humidity ratio is approximately .
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