heat pump


heat pump
a device that uses a compressible refrigerant to transfer heat from one body, as the ground, air, or water, to another body, as a building, with the process being reversible.
[1890-95]

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Device for transferring heat from a substance or space at one temperature to another at a higher temperature.

It consists of a compressor, a condenser, a throttle or expansion valve, an evaporator, and a working fluid (refrigerant). The compressor delivers vapourized refrigerant to the condenser in the space to be heated. There, cooler air condenses the refrigerant and becomes heated during the process. The liquid refrigerant then enters the throttle valve and expands, coming out as a liquid-vapour mixture at a lower temperature and pressure. It then enters the evaporator, where the liquid is evaporated by contact with the warmer space. The vapour then passes to the compressor and the cycle is repeated. A heat pump is a reversible system and is commonly used both to heat and to cool buildings. It operates on the same thermodynamic principles as refrigeration.

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      device for transferring heat from a substance or space at one temperature to another substance or space at a higher temperature. It consists of a compressor, a condenser, a throttle or expansion valve, an evaporator, and a working fluid (refrigerant), such as carbon dioxide, ammonia, or a halocarbon. The compressor delivers the vaporized refrigerant under high pressure and temperature to the condenser, located in the space to be heated. There, the cooler air condenses the refrigerant and becomes heated in the process. The liquid refrigerant then enters the throttle valve and, expanding, comes out as a liquid–vapour mixture at a lower temperature and pressure; it then enters the evaporator, where the liquid is evaporated by contact with a comparatively warmer space. The vapour then passes to the compressor, and the cycle is repeated.

      A heat pump can serve as a reversible system for heating and cooling buildings. See heating.

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Universalium. 2010.

Look at other dictionaries:

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