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641 kJ/kg 2C to 2.75 V 356 W/kg 2C Electric Fuel Battery Corp. UUV 120 Ah zinc–air fuel cell [71] 630 kJ/kg 500 W/kg C/1 Sion Power 2.5 Ah lithium–sulfur battery [72] 2.15 V 25 °C 1260 kJ/kg 70 W/kg C/5 1209 kJ/kg 672 W/kg 2C Stanford Prussian Blue durable Potassium-ion battery [73] 1.35 V room 54 kJ/kg 13.8 W/kg C/1 50 kJ/kg
To express the efficiency of a generator or power plant as a percentage, invert the value if dimensionless notation or same unit are used. For example: A heat rate value of 5 gives an efficiency factor of 20%. A heat rate value of 2 kWh/kWh gives an efficiency factor of 50%. A heat rate value of 4 MJ/MJ gives an efficiency factor of 25%.
The fuel consumption is an equivalent measure for cars sold outside the United States, typically measured in litres per 100 km traveled; in general, the fuel consumption and miles per gallon would be reciprocals with appropriate conversion factors, but because different countries use different driving cycles to measure fuel consumption, fuel ...
Energy; system unit code (alternative) symbol or abbrev. notes sample default conversion combinations SI: yottajoule: YJ YJ 1.0 YJ (2.8 × 10 17 kWh) zettajoule: ZJ ZJ 1.0 ZJ (2.8 × 10 14 kWh)
Since the power equals thrust times speed, the efficiency is given by η = V / ( S F C × h ) {\displaystyle \eta =V/(SFC\times h)} where V is speed and h is the energy content per unit mass of fuel (the higher heating value is used here, and at higher speeds the kinetic energy of the fuel or propellant becomes substantial and must be included).
For example, an ideal fuel cell operating at a temperature of 25 °C having gaseous hydrogen and gaseous oxygen as inputs and liquid water as the output could produce a theoretical maximum amount of electrical energy of 237.129 kJ (0.06587 kWh) per gram mol (18.0154 gram) of water produced and would require 48.701 kJ (0.01353 kWh) per gram mol ...
Brake-specific fuel consumption (BSFC) is a measure of the fuel efficiency of any prime mover that burns fuel and produces rotational, or shaft power. It is typically used for comparing the efficiency of internal combustion engines with a shaft output.
The Alabama facility's $65 million cost equals $590 per kW of power capacity and about $23 per kW⋅h of storage capacity. It uses a nineteen-million-cubic-foot (540,000 m 3) solution-mined salt cavern to store air at up to 1,100 psi (7,600 kPa). Although the compression phase is approximately 82% efficient, the expansion phase requires the ...