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It was originally defined as the rate of heat transfer that results in the freezing or melting of 1 short ton (2,000 lb; 907 kg) of pure ice at 0 °C (32 °F) in 24 hours. [1] [2] The modern definition is exactly 12,000 Btu IT /h (3.516853 kW). Air-conditioning and refrigeration equipment capacity in the U.S. is often specified in "tons" (of ...
The hourly ventilation rate divided by the volume of a space. For perfectly mixed air or laminar flow spaces, this is equal to the number of times per hour that the volume the space is exchanged by mechanical and natural ventilation. Also called air change rate or air exchange rate. Abbreviated ACH or ac/hr. air conditioner
This is a list of airlines which have a current Air Operator Certificate issued by the Civil Aviation Authority of Singapore ... TR: TGW: SCOOTER: 2012 Singapore ...
The neutral unit of construction or neutral unit of currency (code: NUC) is a private currency used by the airline industry, [1] to record fare calculation information. [2] A set of exchange rates is issued by the International Air Transport Association (IATA) every month. [3]
Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical, electric power, mechanical work, light (radiation), or heat. The resulting value, η (eta), ranges between 0 and 1. [1] [2] [3]
It is the rate of heat transfer needed to freeze 1 short ton (907 kg) of water into ice in 24 hours. In the United States and Canada, the R-value that describes the performance of thermal insulation is typically quoted in square foot degree Fahrenheit hours per British thermal unit (ft 2 ⋅°F⋅h/Btu). For one square foot of the insulation ...
A horsepower-hour (symbol: hp⋅h) is an outdated unit of energy, not used in the International System of Units.The unit represents an amount of work a horse is supposed capable of delivering during an hour (1 horsepower integrated over a time interval of an hour).
In 2021, Singapore's oil supply totaled 1,027,948 terajoules, a 42% increase from 2000, comprising both crude and refined products, net of exports and storage. Oil constituted 69.7% of the total energy supply. [9] All of Singapore's crude oil was imported, with imports growing by 13% since 2000. Oil products imports surged to 208.8% of total ...