radiant heating

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radiant heating:

see heatingheating,
means of making a building comfortably warm relative to a colder outside temperature. Old, primitive methods of heating a building or a room within it include the open fire, the fireplace, and the stove.
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Radiant heating

Radiant heating systems involve supplying heat directly to the floor or to panels in the wall or ceiling of a house. When radiant heating is located in the floor, it is often called radiant floor heating or simply floor heating. Radiant heating is more efficient than baseboard heating and usually more efficient than forced-air heating because no energy is lost through ducts. Hydronic or liquid-based systems use little electricity and can also be heated with a wide variety of energy sources, including standard gas-or oil-fired boilers, wood-fired boilers, solar water heaters, or some combination of these heat sources.
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Radiant Heating


a type of heating in which heat is transmitted to the area being heated mainly by radiation and, to a substantially lesser extent, by convection. A characteristic feature of radiant heating is the arrangement of heaters under or in the ceiling of the area. In this case the radiant flux from the heaters propagates mainly downward through a diathermic medium (the air). It is received by the enclosing structures, particularly the floor. People on the premises also receive radiant heat from the heaters. Consequently, an advantage of radiant heating is that the ambient air temperature can be lower than when other types of heating are used. At the same time, the strong flux of radiant energy leads to the necessity of limiting the temperature of the heat-emitting surfaces.

Hot water (the most prevalent), steam, hot air, and electric power are used as the heat-transfer agents in radiant heating to supply the heating elements (for example, cable built into the enclosing structure). The heaters are often an integral part of the ceiling; in this case the floor of the next higher level is heated. To avoid discomfort for people in the area, the temperature of the floor surface should be no higher than 26°C. If the heaters are placed under a ceiling, the flat heat-emitting surfaces are called heating panels. Systems with such heaters are sometimes known as radiant panel systems. Systems of radiant heating exist in which the ceiling, which transmits heat to the premises, is heated by supplying hot air to the area from under the ceiling.

Systems using heating panels can be reset for radiant cooling in summer by passing cold water through the pipes that carry the heat-transfer agent in winter. In this case the temperature of the cooling surface exposed in the area must be kept above the dew point of the air, so that moisture does not condense on it. When heating panels are not used for summer cooling and the heat-transfer agent has a high temperature, it is good practice to arrange the panels vertically, particularly on the outer walls. This panel arrangement is most widely used in the USSR.


Missenard, F.-A. Luchistoe otoplenie i okhlazhdenie. Moscow, 1961. (Translated from French.)


The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

radiant heating

[′rād·ē·ənt ′hēd·iŋ]
Any system of space heating in which the heat-producing means is a surface that emits heat to the surroundings by radiation rather than by conduction or convection.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Radiant heating

Any system of space heating in which the heat-producing means is a surface that emits heat to the surroundings by radiation rather than by conduction or convection. The surfaces may be radiators such as baseboard radiators or convectors, or they may be the panel surfaces of the space to be heated.

The heat derived from the Sun is radiant energy. Radiant rays pass through gases without warming them appreciably, but they increase the sensible temperature of liquid or solid objects upon which they impinge. The same principle applies to all forms of radiant-heating systems, except that convection currents are established in enclosed spaces and a portion of the space heating is produced by convection. Any radiant-heating system using a fluid heat conveyor may be employed as a cooling system by substituting cold water or other cold fluid. However, the technique is not practical on the scale required for comfort control of an occupied space.

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.

radiant heating

Heating which results from heat transmitted by radiation, as contrasted with heat transmitted by conduction or convection.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
Caption: THE POWERHOUSE ENERGY CAMPUS at Colorado State University pairs radiant heating and cooling with a highper-formance envelope and underfloor air distribution.
As the heat transfer process between water and room is quite different from conventional air systems, an international standard on radiant heating and cooling systems has been developed based on system design and existing standards from different countries and was published in 2012.
Department of Energy's Energy Savers website, radiant heating has a number of advantages over other forms of heat distribution: "It is more efficient than baseboard heating and usually more efficient than forced-air heating because no energy is lost through ducts." It is also flexible as it can run off of a variety of energy sources: Gas, oil, wood, solar and other sources or combinations thereof can feed radiant systems.
Practical examples of control strategies for both heating and cooling by means of a floor radiant heating system are discussed by Simmonds (1994), while Leigh and MacCluer (1994) provided a comparative study of varius approaches for radiant floor heating system control.
Such radiant heating systems are inherently efficient because water at 54 degrees doesn't need to be made much hotter before it circulates under floors.
The project involved installing the radiant heating system under one-half of the cold storage facility.
is a leading supplier of PEX-a plumbing, fire safety and radiant heating and cooling systems for the residential and commercial building markets across North America and Europe.
Radiant heating has the reputation of increasing the comfort level in a space and lowering energy bills.
Radiant heating is best known for providing comfortable heat.
Radiant heating has been around since 60 A.D., when the Romans equipped their buildings with crude, wood-fired systems that were surprisingly effective.
The expansion is said to enhance the company's capability to custom design a radiant heating system that meets precise facility requirements for optimum flexibility, economy and maximum energy efficiency.
"Propane can provide the BTUs, in a tank-type or instantaneous-type water heater, to run a radiant heating system for any remodeling project in any climate.