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The coefficient of performance or COP (sometimes CP or CoP) of a heat pump, refrigerator or air conditioning system is a ratio of useful heating or cooling provided to work (energy) required. [ 1 ] [ 2 ] Higher COPs equate to higher efficiency, lower energy (power) consumption and thus lower operating costs.
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 ...
Air-conditioner sizes are often given as "tons" of cooling, where 1 ton of cooling equals 12,000 BTU/h (3.5 kW). 1 ton of cooling equals the amount of power that needs to be applied continuously over a 24-hour period to melt 1 ton of ice. The annual cost of electric energy consumed by an air conditioner may be calculated as follows:
Air conditioning can be achieved using a mechanical 'air conditioner' or by other methods, including passive cooling and ventilative cooling. [ 2 ] [ 3 ] Air conditioning is a member of a family of systems and techniques that provide heating, ventilation, and air conditioning (HVAC) . [ 4 ]
An air conditioning system, or a standalone air conditioner, provides cooling and/or humidity control for all or part of a building. Air conditioned buildings often have sealed windows, because open windows would work against the system intended to maintain constant indoor air conditions.
These systems range from a conceptual system of perfect displacement, which removes and replaces all air in a space, to a short circuit flow in which very little of the existing air is replaced. [2] The actual amount of air changed in a well mixed ventilation scenario will be 63.2% after 1 hour and 1 ACH. [3]
A multistorey car park in Hradec Králové, Czech Republic The interior of a shopping mall's parking garage in Kungälv, Sweden. A multistorey car park [1] [2] (Commonwealth English) or parking garage (American English), [1] also called a multistorey, [3] parking building, parking structure, parkade (mainly Canadian), parking ramp, parking deck, or indoor parking, is a building designed for ...
The Chevrolet Silverado/GMC Sierra 3500, Ford F-350, and Ram 3500 are known as "one ton" pickups. [26] Similar schemes exist for vans and SUVs (e.g. a 1-ton Dodge Van or a 1 ⁄ 2-ton GMC Suburban), medium duty trucks (e.g. the 1 1 ⁄ 2-ton Ford F-550) and some military vehicles, like the ubiquitous deuce-and-a-half.