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hp ≈ 34.5 lb/h × 970.3 BTU IT /lb ≈ 9 809.5 W [35] horsepower (European electrical) hp ≡ 75 kp⋅m/s = 736 W [citation needed] horsepower (electrical) hp ≡ 746 W = 746 W [35] horsepower (mechanical) hp ≡ 550 ft⋅lbf/s [35] = 745.699 871 582 270 22 W: horsepower (metric) hp or PS ≡ 75 m⋅kgf/s = 735.498 75 W [35] litre-atmosphere ...
Less work is required to move heat than for conversion into heat, and because of this, heat pumps, air conditioners and refrigeration systems can have a coefficient of performance greater than one. The COP is highly dependent on operating conditions, especially absolute temperature and relative temperature between sink and system, and is often ...
Just as horsepower and candlepower were intuitive units of measure for people living through the transition from horse to steam power [3] and from flame-based to electric lighting, so was the ton of refrigeration an intuitive unit of measure during a technological change, as the ice trade gradually included growing percentages of artificial ice ...
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).
A typical turbocharged V8 diesel engine might have an engine power of 250 kW (340 hp) and a mass of 380 kg (840 lb), [1] giving it a power-to-weight ratio of 0.65 kW/kg (0.40 hp/lb). Examples of high power-to-weight ratios can often be found in turbines.
The first residential AC was installed by 1914, and by the 1950s there was "widespread adoption of residential AC". [ 13 ] The invention of the components of HVAC systems went hand-in-hand with the Industrial Revolution , and new methods of modernization, higher efficiency, and system control are constantly being introduced by companies and ...
The foot-pound force (symbol: ft⋅lbf, [1] ft⋅lb f, [2] or ft⋅lb [3]) is a unit of work or energy in the engineering and gravitational systems in United States customary and imperial units of measure.
Engineers reused the reduction gear from the Type 82, enabling the 1.5 ton van to use a 25 hp (19 kW) flat four engine. [1] Although the aerodynamics of the first prototypes were poor (with an initial drag coefficient of Cd=0.75), [1] engineers used the wind tunnel at the Technical University of Braunschweig to optimize the design.