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Heat pump

Heat pump. Capacitor expansion valve evaporator compressor. functioning. Heat pumps are powered by different physical principles, but are classified according to their application (transmission of heat, heat source, heat sink or freezer machine). Efficiency.

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Heat pump

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  1. Heat pump • Capacitor • expansion valve • evaporator • compressor functioning Heat pumps are powered by different physical principles, but are classified according to their application (transmission of heat, heat source, heat sink or freezer machine).

  2. Efficiency When comparing the performance of heat pumps, it is best to avoid the word "efficiency" which has a very specific thermodynamic definition. The term coefficient of performance (COP) is used to describe the ratio of useful heat movement to work input. Most vapor-compression heat pumps utilize electrically powered motors for their work input. However, in most vehicle applications, shaft work, via their internal combustion engines, provide the needed work. When used for heating a building on a mild day of say 10 °C, a typical air-source heat pump has a COP of 3 to 4, whereas a typical electric resistance heater has a COP of 1.0. That is, one joule of electrical energy will cause a resistance heater to produce one joule of useful heat, while under ideal conditions, one joule of electrical energy can cause a heat pump to move much more than one joule of heat from a cooler place to a warmer place.

  3. When used for heating a building on a mild day of say 10 °C, a typical air-source heat pump has a COP of 3 to 4, whereas a typical electric resistance heater has a COP of 1.0. That is, one joule of electrical energy will cause a resistance heater to produce one joule of useful heat, while under ideal conditions, one joule of electrical energy can cause a heat pump to move much more than one joule of heat from a cooler place to a warmer place

  4. Geothermal heat pump for air conditioning The geothermal heat pump uses the ground or water that is found in the soil as a source or sink of heat. The transport of thermal energy is effected by the same water or using a liquid anti-freeze, except in direct expansion heat pumps, which uses a refrigerant that circulates in the heat exchanger placed in the ground.

  5. Unlike air heat pumps, geothermal cooling also can operate in passive mode: they extract heat from the building into the system by pumping cold water or antifreeze liquid, without the action of the heat pump itself.The pipe system that runs through the land can be opened or closed. In the open system we extract water from the underground aquifer, the port is up to the heat exchanger and then is discharged into a watercourse, back into the same aquifer or basin in a purpose-built (and which allows the rifiltrazione towards the ground). In the closed system the heat is intercepted by land through a continuous buried pipe with an internal coolant (for pump units) or antifreeze stored at low temperature and pressure.

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