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The higher investment above conventional oil, propane or electric systems may be returned in energy savings in 2–10 years for residential systems in the US. [ 50 ] [ 47 ] [ 49 ] The payback period for larger commercial systems in the US is 1–5 years, even when compared to natural gas. [ 47 ]
In physics, energy density is the quotient between the amount of energy stored in a given system or contained in a given region of space and the volume of the system or region considered.
For reference, about 10,000 100-watt lightbulbs or 5,000 computer systems would be needed to draw 1 MW. Also, 1 MW is approximately 1360 horsepower. Modern high-power diesel-electric locomotives typically have a peak power of 3–5 MW, while a typical modern nuclear power plant produces on the order of 500–2000 MW peak output.
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.
A measure of the amount of heat absorption required to melt I ton of ice in 24 hours. A ton of refrigeration is a measure of the amount of cooling delivered by a heat pump (or other air conditioning system). One ton of refrigeration is equivalent to a cooling rate of 12,000 Btu per hour.
Toshiba 660 MVA water cooled 23 kV AC turbo generator: 1,342 t 2,959,000 lb 660 MW 890,000 hp 0.49 kW/kg 0.30 hp/lb Bayswater, Eraring coal-fired power stations: Canopy Tech. Cypress 32 MW 15 kV AC PM generator [29] 33,557 kg 73,981 lb 32 MW 43,000 hp 0.95 kW/kg 0.58 hp/lb Electric power stations: Turncircles AF24PM–S axial flux motor [30]
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