Discussion
A cold room of \( 220 \) m\(^2\) surface area has a \( U \) value of \( 0.28 \) W/m\(^2\) K across a \( 22 \) degree difference. The transmission load is
Answer: D
Correct answer: 1.36 kW
The transmission load is the overall heat transfer coefficient times the area times the temperature difference:
\[ Q = UA\Delta T = 0.28 \times 220 \times 22 = 1355\ \mathrm{W} = 1.36\ \mathrm{kW} \]
The distractor \( 13.6 \) misplaces the decimal. A \( U \) value of \( 0.28 \) implies substantial insulation, and the resulting load is modest next to the respiration load calculated for a similar store - which is a useful reminder that in a produce store the contents, not the fabric, often dominate.
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