Subtopic: Psychrometry – properties of air-water vapour mixture
Question Statement:
Match psychrometric processes (Sensible cooling; Cooling & dehumidification; Chemical dehumidification; Heating & humidification) with the thermodynamic property changes.
Options:
(A) 1-R, 2-S, 3-Q, 4-P
(B) 1-P, 2-R, 3-S, 4-Q
(C) 1-R, 2-S, 3-P, 4-Q
(D) 1-P, 2-Q, 3-S, 4-R
Official Answer Key:
C
Step-by-Step Solution & Explanation
Sensible cooling (1): DBT decreases, no moisture removed so dew point stays constant → (R). Cooling and dehumidification (2): DBT decreases and moisture is removed, so dew point also decreases → (S). Chemical dehumidification (3): the desiccant's heat of adsorption raises DBT while moisture (and hence dew point) decreases → (P). Heating and humidification (4): DBT increases and moisture is added, so dew point increases too → (Q).
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