Thermodynamic cycles

According to the additional law of thermodynamics calefaction cannot spontaneously breeze from a colder area to a hotter area; plan is appropriate to accomplish this.3 An air conditioner requires plan to air-conditioned a active space, affective calefaction from the acknowledgment autogenous (the calefaction source) to the warmer outdoors (the calefaction sink). Similarly, a refrigerator moves calefaction from central the algid icebox (the calefaction source) to the warmer room-temperature air of the kitchen (the calefaction sink). The operating assumption of the algidity aeon was declared mathematically by Sadi Carnot in 1824 as a calefaction engine. A calefaction pump can be anticipation of as calefaction engine which is operating in reverse.

Heat pump and algidity cycles can be classified as breath compression, breath absorption, gas cycle, or Stirling aeon types.