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  2. Past paper - Wikipedia

    en.wikipedia.org/wiki/Past_paper

    A past paper is an examination paper from a previous year or previous years, usually used either for exam practice or for tests such as University of Oxford, [1] [2] University of Cambridge [3] College Collections. Exam candidates find past papers valuable in test preparation.

  3. Bikaner Technical University - Wikipedia

    en.wikipedia.org/wiki/Bikaner_Technical_University

    Bikaner Technical University (BTU) is a technical state university located in Bikaner, Rajasthan, India. BTU is based in the campus of the College of Engineering & Technology, Bikaner in Karni Industrial Area, Bikaner, approximately 400 kilometres (250 mi) from New Delhi .

  4. Refrigeration - Wikipedia

    en.wikipedia.org/wiki/Refrigeration

    The measured capacity of refrigeration is often dimensioned in the unit of kW or BTU/h. Domestic and commercial refrigerators may be rated in kJ/s, or Btu/h of cooling. For commercial and industrial refrigeration systems, the kilowatt (kW) is the basic unit of refrigeration, except in North America, where both ton of refrigeration and BTU/h are ...

  5. British thermal unit - Wikipedia

    en.wikipedia.org/wiki/British_thermal_unit

    The Btu should not be confused with the Board of Trade Unit (BTU), an obsolete UK synonym for kilowatt hour (1 kW⋅h or 3,412 Btu). The Btu is often used to express the conversion-efficiency of heat into electrical energy in power plants. Figures are quoted in terms of the quantity of heat in Btu required to generate 1 kW⋅h of electrical energy.

  6. Fuel efficiency - Wikipedia

    en.wikipedia.org/wiki/Fuel_efficiency

    The inverse of "energy efficiency" is "energy intensity", or the amount of input energy required for a unit of output such as MJ/passenger-km (of passenger transport), BTU/ton-mile or kJ/t-km (of freight transport), GJ/t (for production of steel and other materials), BTU/(kW·h) (for electricity generation), or litres/100 km (of vehicle travel).

  7. Heat pump - Wikipedia

    en.wikipedia.org/wiki/Heat_pump

    [73] [84] The 100-year GWP of propane, at 0.02, is extremely low and is approximately 7000 times less than R-32. However, the flammability of propane requires additional safety measures: the maximum safe charges have been set significantly lower than for lower flammability refrigerants (only allowing approximately 13.5 times less refrigerant in ...

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  9. Flow measurement - Wikipedia

    en.wikipedia.org/wiki/Flow_measurement

    When gases or liquids are transferred for their energy content, as in the sale of natural gas, the flow rate may also be expressed in terms of energy flow, such as gigajoule per hour or BTU per day. The energy flow rate is the volumetric flow rate multiplied by the energy content per unit volume or mass flow rate multiplied by the energy ...