Dimensionless parameter among the following options is
Options:
(A) heat exchanger effectiveness
(B) humid heat of air-water vapour mixture
(C) humid volume of air-water vapour mixture
(D) overall heat transfer coefficient
Official Answer Key:
A
Step-by-Step Solution & Explanation
Effectiveness ε = Q_actual/Q_maximum-possible — a ratio of two heat transfer rates, so the units cancel and ε is dimensionless (0 ≤ ε ≤ 1).
The others all carry units:
- Humid heat: kJ·kg⁻¹ dry air·K⁻¹
- Humid volume: m³·kg⁻¹ dry air
- Overall heat transfer coefficient U: W·m⁻²·K⁻¹
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