A day-ton of refrigeration is defined as the amount of refrigeration produced by melting 1 ton of ice at 32°F in 24 hours.

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Study for the NOCTI Heating, Ventilation, and Air Conditioning (HVAC) Test. Practice with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

A day-ton of refrigeration is defined as the amount of refrigeration produced by melting 1 ton of ice at 32°F in 24 hours.

Explanation:
A day-ton of refrigeration is a unit of cooling capacity defined by the heat needed to melt one ton (2000 pounds) of ice at 32°F in 24 hours. The latent heat of fusion for ice at 32°F is about 144 BTU per pound, so melting 2000 pounds requires 2000 × 144 = 288,000 BTU in a day. Dividing that by 24 hours gives 12,000 BTU per hour, which is exactly one ton of refrigeration. This is why HVAC equipment capacities are described in tons, with 1 ton equaling 12,000 BTU/hr. The other options don’t fit because this is a standard, explicit definition in the field.

A day-ton of refrigeration is a unit of cooling capacity defined by the heat needed to melt one ton (2000 pounds) of ice at 32°F in 24 hours. The latent heat of fusion for ice at 32°F is about 144 BTU per pound, so melting 2000 pounds requires 2000 × 144 = 288,000 BTU in a day. Dividing that by 24 hours gives 12,000 BTU per hour, which is exactly one ton of refrigeration. This is why HVAC equipment capacities are described in tons, with 1 ton equaling 12,000 BTU/hr. The other options don’t fit because this is a standard, explicit definition in the field.

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