Information about Btu / h, Kcal / h, TR and watts.

In relation to the units cited: - Btu (British Thermal Unit) is defined as the amount of heat needed to raise the temperature of 1lb (pound) of water from 63ºF to 64ºF. The Btu / h power unit is a unit widely used in window air conditioners; - Kcal (kilocalorie) is a caloric multiple (lime), ie: 1Kcal = 103 cal and lime is the heat required to raise the temperature of one gram of water from 14.5 ° C to 15.5 ° C. The power unit Kcal / h is widely used in refrigeration calculation; - TR (refrigeration ton) - English Unit - Definition: 1 TR is the amount of heat needed to melt an English ton of ice in a 24-hour period. TR is a unit widely used in large refrigeration equipment such as chillers and selfs. In this case the TR is used because its values ​​are in numbers, smaller than in other units. - W (watts) - power unit of the International System of Units (S.I.), is obtained from the division J / s (joule per second). Because it is a unit of the S.I., it is the unit found in catalogs of equipment manufacturers, so the calculations for sizing and selection are developed in watts (W). Equivalence between the units mentioned: 12,000 Btu / h = 1,0 TR = 3,024 Kcal / h = 3,516,28 W.