Heat Transfer

(redirected from Heat absorption)

Heat transfer

Heat, a form of kinetic energy, is transferred in three ways: conduction, convection, and radiation. Heat transfer (also called thermal transfer) can occur only if a temperature difference exists, and then only in the direction of decreasing temperature. Beyond this, the mechanisms and laws governing each of these ways are quite different. See Conduction (heat), Convection (heat), Heat radiation

By utilizing a knowledge of the principles governing the three methods of heat transfer and by a proper selection and fabrication of materials, the designer attempts to obtain the required heat flow. This may involve the flow of large amounts of heat to some point in a process or the reduction in flow in others. All three methods operate in processes that are commonplace.

In industry, for example, it is generally desired to extract heat from one fluid stream and add it to another. Devices used for this purpose have passages for each of the two streams separated by a heat-exchange surface in the form of plates or tubes and are known as heat exchangers. The automobile radiator, the hot-water heater, the steam or hot-water radiator in a house, the steam boiler, the condenser and evaporator on the household refrigerator or air conditioner, and even the ordinary cooking utensils in everyday use are all heat exchangers. See Heat

Heat transfer

A generic term for thermal conduction, convection, and radiation.

Heat Transfer

 

the spontaneous irreversible movement of heat in space owing to a nonuniform temperature field. In the general case, heat transfer may also result from the nonuniformity of the fields of other physical quantities; an example is a difference in concentrations. Heat is transferred in three ways: conduction, convection, and radiation. In practice, heat transfer usually occurs through all three mechanisms at the same time.

Heat transfer determines or accompanies many processes in daily life, in technology, and in nature—for example, meteorological processes at the earth’s surface and the evolution of stars and planets. In many cases, such as in the study of dehydration, evaporative cooling, and diffusion, heat transfer is considered together with mass transfer. A special case of heat transfer is the flow of heat from one heat-transfer fluid to another through a solid wall separating the fluids or through an interface between the fluids.

heat transfer

[′hēt ¦tranz·fər]
(thermodynamics)
The movement of heat from one body to another (gas, liquid, solid, or combinations thereof) by means of radiation, convection, or conduction.

Heat transfer

Heat, a form of kinetic energy, is transferred in three ways: conduction, convection, and radiation. Heat transfer (also called thermal transfer) can occur only if a temperature difference exists, and then only in the direction of decreasing temperature. Beyond this, the mechanisms and laws governing each of these ways are quite different. See Conduction (heat), Convection (heat)

By utilizing a knowledge of the principles governing the three methods of heat transfer and by a proper selection and fabrication of materials, the designer attempts to obtain the required heat flow. This may involve the flow of large amounts of heat to some point in a process or the reduction in flow in others. All three methods operate in processes that are commonplace.

In industry, for example, it is generally desired to extract heat from one fluid stream and add it to another. Devices used for this purpose have passages for each of the two streams separated by a heat-exchange surface in the form of plates or tubes and are known as heat exchangers. The automobile radiator, the hot-water heater, the steam or hot-water radiator in a house, the steam boiler, the condenser and evaporator on the household refrigerator or air conditioner, and even the ordinary cooking utensils in everyday use are all heat exchangers. See Heat exchanger

heat transfer

The flow of heat from one body at higher temperature to another body at a lower temperature, until the two temperatures are equal.
References in periodicals archive ?
The Persian Gulf region is especially vulnerable, the researchers say, because of a combination of low elevations, clear sky, water body that increases heat absorption, and the shallowness of the Persian Gulf itself, which produces high water temperatures that lead to strong evaporation and very high humidity.
There would be escalators to enable people move up to the station without taking a single step and roof of the stations would be made of insulated sheets to avoid heat absorption.
The Geoplus infill is made from 100% environmentally friendly materials reducing surface temperatures by up to 40 degrees Fahrenheit by resisting heat absorption and retaining humidity.
These specialized colorants minimize heat absorption, and can improve color retention up to 25 percent over standard finishes.
With high-temperature polymers, oil cooling is preferred in the solids feeding area, as the high heat absorption of water--particularly as it flashes to steam--could extract enough heat from the screw to disrupt melting farther down the screw.
Also, to investigate the effect of PCM concentration (in CNT coating layer) on heat absorption, we repeated the test for an extra sample of solar tube coated with CNT and 14 gr [0.
The design uses a larger copper base for heat absorption and the heat pipes are in contact with a bigger part of the heat sink and exposed to more airflow to ensure the highest performance of the GPU because of optimal temperatures.
This is heat absorption, do not confuse it with heat conductivity.
Should it rain during the aircraft's tumaround time, the heat absorption of the cold fuel can lead to the formation of clear ice on the wings' surface.
This might be potentially useful to help reduce heat absorption on the roofs and walls of buildings, which is an evolving field of considerable interest in warm regions where cooling is a major expense.
This acts as a thermal shield to deflect heat away from the feet eliminating overheating, and all of the complications related to heat absorption.
3 Keep areas of non-permeable surfaces such as drives, paths and patios to a minimum to help reduce heat absorption / radiation and flooding.