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The therm (symbol, thm) is a non-SI unit of heat energy equal to 100,000 British thermal units (BTU), [1] and approximately 105 megajoules, 29.3 kilowatt-hours, 25,200 kilocalories and 25.2 thermies. One therm is the energy content of approximately 100 cubic feet (2.83 cubic metres) of natural gas at standard temperature and pressure. However ...
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)
1 therm is defined in the United States as 100,000 Btu using the Btu 59 °F definition. In the EU it was listed in 1979 with the BTU IT definition and planned to be discarded as a legal unit of trade by 1994. [21] United Kingdom regulations were amended to replace therms with joules with effect from 1 January 2000. [22]
A unit of electrical energy, particularly for utility bills, is the kilowatt-hour (kWh); [3] one kilowatt-hour is equivalent to 3.6 megajoules. Electricity usage is often given in units of kilowatt-hours per year or other periods. [4] This is a measurement of average power consumption, meaning the average rate at which energy is transferred ...
= [kW⋅h] As total energy consumption is in kilowatt hours and heating degree days are [no. days×degrees] we must convert watts per kelvin into kilowatt hours per degree per day by dividing by 1000 (to convert watts to kilowatts), and multiplying by 24 hours in a day (1 kW = 1 kW⋅h/h).
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Kilowatt-hours are a product of power and time, not a rate of change of power with time. Watts per hour (W/h) is a unit of a change of power per hour, i.e. an acceleration in the delivery of energy. It is used to measure the daily variation of demand (e.g. the slope of the duck curve ), or ramp-up behavior of power plants .
Total mass-energy of 1 microgram of matter (25 kWh) 10 8 1×10 8 J: Kinetic energy of a 55 tonne aircraft at typical landing speed (59 m/s or 115 knots) [citation needed] 1.1×10 8 J: ≈ 1 therm, depending on the temperature [59] 1.1×10 8 J: ≈ 1 Tour de France, or ~90 hours [127] ridden at 5 W/kg [128] by a 65 kg rider [129] 7.3×10 8 J