heat pump


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heat pump:

see air conditioningair conditioning,
mechanical process for controlling the humidity, temperature, cleanliness, and circulation of air in buildings and rooms. Indoor air is conditioned and regulated to maintain the temperature-humidity ratio that is most comfortable and healthful.
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Heat pump

An electric device with both heating and cooling capabilities. It extracts heat from one medium at a lower (the heat source) temperature and transfers it to another at a higher temperature (the heat sink), thereby cooling the first and warming the second. Because they move heat rather than generate heat, heat pumps can significantly reduce energy costs. Air-source, ductless mini-split, geothermal, and absorption are some of the varieties of heat pumps used in homes.

Heat Pump

 

a device that transfers thermal energy from a lowtemperature heat source, most often the environment, to a high-temperature heat receiver. The operation of a heat pump requires the consumption of external mechanical, electrical, chemical, or other type of energy. The processes that occur in a heat pump are similar to those involving the working fluid of a refrigerator, except that refrigeration equipment is designed to generate cold, whereas a heat pump generates heat. Liquids with a low boiling point, such as Freon or ammonia, are the working fluids normally used in a heat pump.

The heat flowing into the receiver of a heat pump consists not only of a quantity equivalent to the external work performed but also heat from a heat source, such as river water. Consequently, the energy conversion factor for a heat pump is always greater than 1, and the conversion process is more favorable than the direct conversion of electrical, mechanical, or chemical energy into heat. However, the trend in power engineering toward joint production of heat and electric power limits the use of heat pumps to situations in which other forms of thermal energy cannot be readily supplied—for example, in locations far from district heat and power plants.

Heat pumps are sometimes used for heating buildings in regions with warm climates, since the same unit may be using during the summer to cool incoming air. Because of fuel shortages, heat pumps were widely used during World War II (1939–45), particularly in countries that had a surplus of cheap hydroelectric power, such as Switzerland, Sweden, and Norway.

V. S. BUNIN

heat pump

[′hēt ‚pəmp]
(mechanical engineering)
A device which transfers heat from a cooler reservoir to a hotter one, expending mechanical energy in the process, especially when the main purpose is to heat the hot reservoir rather than refrigerate the cold one.

Heat pump

The thermodynamic counterpart of the heat engine. A heat pump raises the temperature level of heat by means of work input. In its usual form a compressor takes refrigerant vapor from a low-pressure, low-temperature evaporator and delivers it at high pressure and temperature to a condenser (see illustration). The pump cycle is identical with the customary vapor-compression refrigeration system. See Refrigeration cycle

This dual purpose is accomplished, in effect, by placing the low-temperature evaporator in the conditioned space during the summer and the high-temperature condenser in the same space during the winter. Thus, if 70°F (21°C) is to be maintained in the conditioned space regardless of the season, this would be the theoretical temperature of the evaporating coil in summer and of the condensing coil in winter. The actual temperatures on the refrigerant side of these coils would need to be below 70°F in summer and above 70°F in winter to permit the necessary transfer of heat through the coil surfaces. If the average outside temperatures are 100°F (38°C) in summer and 40°F (40°C) in winter, the heat pump serves to raise or lower the temperature 30° (17°C) and to deliver the heat or cold as required.

The heat pump is also used for a wide assortment of industrial and process applications such as low-temperature heating, evaporation, concentration, and distillation.

heat pump

heat pump
A device that transfers heat from a cooler reservoir to a hotter reservoir by means of a heat exchanger, requiring the expenditure of mechanical energy in the process; used in an air conditioner whose cooling cycle can be reversed so that it can function as a heater.
References in periodicals archive ?
While you should cut your home's CO2 emissions by fitting a heat pump, how much will depend on the type of heating you're replacing.
Fujitsu heat pumps are the best heat pumps in the market now and getting a Fujitsu heat pump at this low price is a very good deal which comes with 6 year warranty on this Fujitsu heat pump.
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25D(d)(5)(B)(i) defines a geothermal heat pump as a piece of equipment that uses the ground or groundwater as a thermal energy source to heat a structure and/or as a thermal energy sink to cool a structure.
To assess the actual amount of total energy consumption, the lead researcher, Sarah Widder, and associates set up heat pump water heaters in the PNNL Test Homes, which were specifically built and furnished for tests related to energy-efficient technologies.
The study described here involved determining heating loads (house and domestic hot water) for a renovated 1940s era house in middle Sweden; these loads were then used as inputs to a model of a Swedish heat pump coupled to a ground heat exchanger model.
A one year study of a heat pump installation in the Southcentral Alaska found that deeper (9 ft, 2.
The industrial water heat pump design allowed an energy-efficiency increase of 25%, in comparison to conventional commercial heat pumps.
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Geothermal heat pumps provide an efficient and reliable option for residential, commercial, and institutional building owners by exploiting the nearly constant temperatures found beneath the earth's crust.