Question Bank • QB_EXP_APE_PSY_006 NAT • 2 Marks

Section 6: Agricultural Process Engineering

Psychrometry & Moist Air Thermodynamics

Subtopic: Sensible heating process on psychrometric chart

Question Statement:

Moist air flows at $2.0\text{ kg dry air/s}$ along the horizontal sensible heating trajectory shown in the psychrometric chart from $25^\circ\text{C}$ to $65^\circ\text{C}$. Taking the humid specific heat $c_s = 1.02\text{ kJ/(kg}\cdot\text{K)}$, calculate the rate of heat addition $Q$ in $\text{kW}$ (round off to one decimal place).

Answer Key:

81.6

Step-by-Step Solution & Explanation

$Q = m_a c_s (T_{db2} - T_{db1}) = 2.0 \times 1.02 \times (65 - 25) = 2.0 \times 1.02 \times 40 = 81.6\text{ kW}$.
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