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  2. Thermal efficiency - Wikipedia

    en.wikipedia.org/wiki/Thermal_efficiency

    For a heat engine, thermal efficiency is the ratio of the net work output to the heat input; in the case of a heat pump, thermal efficiency (known as the coefficient of performance or COP) is the ratio of net heat output (for heating), or the net heat removed (for cooling) to the energy input (external work). The efficiency of a heat engine is ...

  3. Temperature–entropy diagram - Wikipedia

    en.wikipedia.org/wiki/Temperature–entropy_diagram

    Q H = W + Q C = heat exchanged with the hot reservoir. η = W / (Q C + Q H) = thermal efficiency of the cycle If the cycle moves in a clockwise sense, then it is a heat engine that outputs work; if the cycle moves in a counterclockwise sense, it is a heat pump that takes in work and moves heat Q H from the cold reservoir to the hot reservoir.

  4. Thermodynamic diagrams - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_diagrams

    Thermodynamic diagrams usually show a net of five different lines: isobars = lines of constant pressure; isotherms = lines of constant temperature; dry adiabats = lines of constant potential temperature representing the temperature of a rising parcel of dry air

  5. Energy conversion efficiency - Wikipedia

    en.wikipedia.org/wiki/Energy_conversion_efficiency

    Efficiency of power plants, world total, 2008. Energy conversion efficiency (η) is the ratio between the useful output of an energy conversion machine and the input, in energy terms. The input, as well as the useful output may be chemical, electric power, mechanical work, light (radiation), or heat.

  6. Thermodynamic cycle - Wikipedia

    en.wikipedia.org/wiki/Thermodynamic_cycle

    The thermal efficiency of a Carnot cycle depends only on the absolute temperatures of the two reservoirs in which heat transfer takes place, and for a power cycle is: = where is the lowest cycle temperature and the highest.

  7. Plants vs. Zombies 2 - Wikipedia

    en.wikipedia.org/wiki/Plants_vs._Zombies_2

    Plants vs. Zombies 2 (originally subtitled: It's About Time) is a 2013 free tower defense video game developed by PopCap Games and published by Electronic Arts. It is the sequel to Plants vs. Zombies , and was released worldwide on Apple App Store on August 15, 2013, and Google Play on October 23, 2013.

  8. Thornthwaite climate classification - Wikipedia

    en.wikipedia.org/wiki/Thornthwaite_climate...

    Thornthwaite developed four indices: the Moisture Index (Im), the aridity and humidity indexes (Ia/Ih), the Thermal Efficiency Index (TE) and the Summer Concentration of Thermal Efficiency (SCTE). Each of the four climatic types can be described by an English alphabet letter and are arranged exactly by the order shown previously. [5]

  9. House Energy Rating - Wikipedia

    en.wikipedia.org/wiki/House_energy_rating

    The energy efficiency rating in this HERS represents the predicted energy consumption, represents the form of normalized annual energy consumption. This rating scheme consist a detailed measure of CFLs, water heater tanks, ceiling, floors and pipe insulation , efficient refrigerator and freezer, high efficient space and water heating equipments ...