Psychrometrics: wet-bulb behavior during sensible heating. Process: heat moist air with no moisture addition (specific humidity constant). How does the wet-bulb temperature change during this sensible heating process? Choose the correct trend.
Mechanical Engineering
Heat Transfer, Refrigeration and Air Conditioning
Difficulty: Easy
Choose an option
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Aincreases
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Bdecreases
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Cremains constant
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Dbecomes equal to the dry-bulb temperature
Answer
Correct Answer: increases
Explanation
GivenSensible heating ⇒ dry-bulb temperature rises, humidity ratio remains (approximately) constant.
ConceptOn a psychrometric chart, at constant humidity ratio, moving to higher dry-bulb generally increases enthalpy and wet-bulb temperature. Relative humidity decreases.
ConclusionsWet-bulb temperature increases during sensible heating.
Final Answerincreases.