Discussion
One ton of refrigeration heat is equivalent to the amount of heat required to melt 1 ton of ice at 0°C in-
Answer: C
One ton of refrigeration is the heat needed to melt 1 ton of ice at 0°C in 24 hours.
The unit comes from the days when cooling was done with ice. Melting one short ton (2,000 lb) of ice absorbs 2,000 times its latent heat of 144 Btu/lb, spread over a day:
\[ \begin{aligned} \text{TR} &= \frac{2000 \times 144}{24} \\ &= 12{,}000\ \text{Btu/h} \approx 3.517\ \text{kW} \end{aligned} \]
Taking 1 hour instead would make the unit 24 times larger, 12 hours twice as large, and 1 minute 1,440 times as large. The day-long rate is what defines the ton.
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