ASHRAE Terminology

A Comprehensive Glossary of Terms for the Built Environment
ashrae.org/ashraeterms

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cooling-tower ton

total heat rejection capacity of a cooling tower, traditionally, 15,000 Btu/h. Note: this value is based on 25% compressor heat added to a ton of refrigeration. Current energy-efficient equipment may have lower values than traditional values.

part-load value

single number figure of merit expressing part-load efficiency for equipment on the basis of weighted operation at various partial-load capacities for the equipment, expressed in kilowatts per ton of refrigeration.

ton day of refrigeration

heat removed by a ton of refrigeration operating for a day, 288,000 Btu (approximately 84.3 kWh).

ton of refrigeration

time rate of cooling equal to 12,000 Btu/h (approximately 3517 W). It is a quantity approximately equal to the latent heat of fusion or melting of 1 ton (2000 lb) of ice, from and at 32°F (0°C).

wet ton (moisture ton)

latent heating or cooling load. See ton of refrigeration.