Tons Of Refrigeration to Watts (TR to W)
1 ton of refrigeration equals 3,516.852842 watts (rounded).
How to convert tons of refrigeration to watts
To convert tons of refrigeration to watts, multiply the number of tons of refrigeration by 3,516.852842. The factor is rounded to 10 significant digits. To go the other way, multiply watts by 0.0002843451361 (rounded).
watts = tons of refrigeration × 3,516.852842
Example: 10 tons of refrigeration = 35,168.52842 watts.
Several different horsepower units exist. This site lists mechanical (745.7 W), metric (735.5 W) and electrical (746 W) horsepower separately.
About these units
Ton Of Refrigeration (TR)
12,000 BTU per hour, about 3.517 kW: the cooling power of melting one short ton of ice in a day. Air-conditioner capacity is quoted in tons.
Cooling capacity was first sold in the age of ice. The ton of refrigeration was the rate at which a machine could freeze, or an ice block could melt, one short ton of pure ice at 0 degrees Celsius in 24 hours. It grew up in the 1880s as mechanical refrigeration replaced natural ice, and Thomas Shipley of the York Manufacturing Company helped make it an industry standard in 1903.
The modern definition drops the ice and fixes the rate at 12,000 International Table British thermal units per hour, which is 3.516853 kilowatts, or about 3,026 kilocalories per hour. NIST gives the same figure as 3.516853 x 10^3 watts and does not mark it as exact. The unit survives mainly in North America, where air-conditioning and chiller capacity is quoted in tons, and a three-ton system therefore removes about 10.5 kilowatts of heat.
1 ton of refrigeration = 3,516.852842 watts (approximately).
Sources: Wikipedia: Ton of refrigeration; NIST SP 811, Appendix B.8
Watt (W)
The SI unit of power: one joule per second. A typical LED bulb uses 5–10 W and a laptop 30–60 W.
Credit for the name goes to C. William Siemens, who proposed it in August 1882 in his presidential address to the British Association for the Advancement of Science. He chose it to honor James Watt, the Scottish inventor who in 1776 improved the Newcomen steam engine. An International Conference on Electric Units and Standards adopted Siemens' definition in London in October 1908 as the international watt. After the 1948 General Conference on Weights and Measures the unit was redefined in absolute terms, and in 1960 the 11th General Conference adopted it into the SI as the unit of power.
Today one watt is one joule per second, or equivalently one volt times one ampere. Orders-of-magnitude tables put an LED light bulb at about 7 W and an adult's basal metabolic rate at roughly 100 W. A 100 kg person climbing a 3 m ladder in 5 seconds works at about 600 W, while a laborer can sustain around 75 W over an eight-hour day. The watt measures a rate, so it says how fast energy is being used, not how much has been used in total.
The watt is the reference unit for power on this site.
Sources: Wikipedia: Watt; Wikipedia: Orders of magnitude (power)
Related conversions
- Watts to tons of refrigeration (reverse)
- Tons of refrigeration to kilowatts
- Tons of refrigeration to horsepower
- Kilowatts to watts
- Horsepower to watts
- Megawatts to watts
- Gigawatts to watts
- Metric horsepower to watts
- BTU per hour to watts
- Milliwatts to watts
- Electrical horsepower to watts
- Foot-pounds per second to watts
- Kilocalories per hour to watts
- Calories per second to watts
- Ergs per second to watts
See all power units.