Radiation - Revision history

Editor at 08:40, 12 May 2022

2022-05-12T08:40:19Z

← Older revision		Revision as of 08:40, 12 May 2022
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	Most 'terrestrial' radiation occurs within the far or long wave infra-red wavebands. The wavelength of terrestrial radiation varies with temperature, however at room temperature approximately 97% of the radiation emanating from a perfect emitter will be within the range 3,000nm to 50,000nm.		Most 'terrestrial' radiation occurs within the far or long wave infra-red wavebands. The wavelength of terrestrial radiation varies with temperature, however at room temperature approximately 97% of the radiation emanating from a perfect emitter will be within the range 3,000nm to 50,000nm.
		+
		+	= Nuclear Radiation =
		+
		+	Nuclear radiation (also called ionising radiation) is energy released as high-speed charged particles or electromagnetic waves. Radiation can come from many sources, both natural and manufactured. All living things are constantly exposed to low doses of radiation from rocks, sunlight and cosmic rays. There are four major types of radiation: alpha, beta, neutrons, and electromagnetic waves such as gamma rays. There are 3 types of nuclear radiation; Alpha particles, which can only travel short distances and cannot travel through human skin, Beta particles which can penetrate through human skin, but cannot go through your body and Gamma radiation which can go all the way through the human body.

	= Greenhouse effect =		= Greenhouse effect =

Designing Buildings at 09:11, 20 December 2021

2021-12-20T09:11:29Z

← Older revision		Revision as of 09:11, 20 December 2021
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	* Photovoltaics.		* Photovoltaics.
	* Radiant heating.		* Radiant heating.
		+	* Radiative effect.
		+	* Radiative forcing.
	* Shading coefficient.		* Shading coefficient.
	* Solar gain.		* Solar gain.
	* Solar heat gain coefficient.		* Solar heat gain coefficient.
	* Solar thermal panels.		* Solar thermal panels.
−	* Tempering heating.
−	* Thermal bridge.
	* Thermal optical properties		* Thermal optical properties
−	* U value.
	* Visible light.		* Visible light.

	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]		[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]

Editor at 18:27, 1 December 2021

2021-12-01T18:27:19Z

← Older revision		Revision as of 18:27, 1 December 2021
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	See emissivity for more information.		See emissivity for more information.

−	= Related articles on Designing Buildings ~~Wiki~~ =	+	= Related articles on Designing Buildings =

	* Albedo.		* Albedo.
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	* Conduction.		* Conduction.
	* Convection.		* Convection.
		+	* Electromagnetic spectrum.
	* Emissivity.		* Emissivity.
	* g-value.		* g-value.

Editor at 13:24, 21 January 2021

2021-01-21T13:24:54Z

← Older revision		Revision as of 13:24, 21 January 2021
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	* Heat transfer.		* Heat transfer.
	* Low-e glass.		* Low-e glass.
		+	* Phosphorescent building materials.
	* Photovoltaics.		* Photovoltaics.
	* Radiant heating.		* Radiant heating.

Designing Buildings at 11:47, 25 September 2020

2020-09-25T11:47:36Z

← Older revision		Revision as of 11:47, 25 September 2020
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	* Visible light.		* Visible light.

−	[[Category:Theory]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:Theory]]

Editor at 18:06, 26 May 2020

2020-05-26T18:06:02Z

← Older revision		Revision as of 18:06, 26 May 2020
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	* Solar heat gain coefficient.		* Solar heat gain coefficient.
	* Solar thermal panels.		* Solar thermal panels.
		+	* Tempering heating.
	* Thermal bridge.		* Thermal bridge.
	* Thermal optical properties		* Thermal optical properties

Designing Buildings at 07:19, 7 January 2020

2020-01-07T07:19:39Z

← Older revision		Revision as of 07:19, 7 January 2020
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	= Introduction =		= Introduction =

−	Radiation is a heat transfer mechanism, along with conduction, convection ~~and~~ phase change. All bodies which are hotter than 0°K emit thermal radiation. They also absorb thermal radiation emitted by their surroundings. The difference in the total amount of radiation emitted and absorbed by a body at any given moment may result in a net heat transfer which will produce a change in the temperature of that body.	+	Radiation is a heat transfer mechanism, along with conduction, convection, phase change and mass transfer. All bodies which are hotter than 0°K emit thermal radiation. They also absorb thermal radiation emitted by their surroundings. The difference in the total amount of radiation emitted and absorbed by a body at any given moment may result in a net heat transfer which will produce a change in the temperature of that body.

	Thermal radiation includes all those wavelengths of the electromagnetic spectrum which will heat a body when absorbed by it, ranging from about 100nm to 100,000nm. In general, the higher the temperature of a body, the lower the average wavelength of the radiation it emits.		Thermal radiation includes all those wavelengths of the electromagnetic spectrum which will heat a body when absorbed by it, ranging from about 100nm to 100,000nm. In general, the higher the temperature of a body, the lower the average wavelength of the radiation it emits.
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	= Greenhouse effect =		= Greenhouse effect =

−	~~This~~ difference produces effects such as the greenhouse effect. The atmosphere is relatively transparent to solar radiation, this means it allows sunlight to enter the atmosphere and heat the Earth’s surface. These surfaces then re-radiate that heat as long-wave infra-red radiation, which greenhouse gases tend to absorb rather than transmit. The result is that the long-wave infra-red radiation is ‘trapped’ and heat accumulates in the atmosphere causing a warming process~~. See greenhouse gases for more information~~.	+	The difference between long wave infrared radiation and short wave solar radiation produces effects such as the greenhouse effect.
		+
		+	The atmosphere is relatively transparent to solar radiation, this means it allows sunlight to enter the atmosphere and heat the Earth’s surface. These surfaces then re-radiate that heat as long-wave infra-red radiation, which greenhouse gases tend to absorb rather than transmit. The result is that the long-wave infra-red radiation is ‘trapped’ and heat accumulates in the atmosphere causing a warming process.

	See greenhouse effect for more information.		See greenhouse effect for more information.
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	See emissivity for more information.		See emissivity for more information.

−	~~= Find out more =~~	+	= Related articles on Designing Buildings Wiki =
−		+
−	=== Related articles on Designing Buildings Wiki ===	+

	* Albedo.		* Albedo.

Designing Buildings at 14:08, 9 August 2017

2017-08-09T14:08:39Z

← Older revision		Revision as of 14:08, 9 August 2017
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	* Thermal optical properties		* Thermal optical properties
	* U value.		* U value.
		+	* Visible light.

	[[Category:Theory]]		[[Category:Theory]]

Editor at 11:05, 4 December 2015

2015-12-04T11:05:53Z

← Older revision		Revision as of 11:05, 4 December 2015
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−
	= Introduction =		= Introduction =

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	The range of terrestrial temperatures experienced within the built environment is relatively small, and relative to the temperature of the sun this range is ‘cold’ and so radiating at a ‘long’ wavelength compared to the sun. This anomaly allows us to categorise thermal radiation as short-wave solar radiation and terrestrial or long wave infra-red radiation.		The range of terrestrial temperatures experienced within the built environment is relatively small, and relative to the temperature of the sun this range is ‘cold’ and so radiating at a ‘long’ wavelength compared to the sun. This anomaly allows us to categorise thermal radiation as short-wave solar radiation and terrestrial or long wave infra-red radiation.

−	[[File:~~Thermal wavelengths of the electromagnetic spectrum~~.jpg\|~~RTENOTITLE~~]]	+	[[File:Thermal_wavelengths_of_the_electromagnetic_spectrum.jpg\|link=File:Thermal_wavelengths_of_the_electromagnetic_spectrum.jpg]]

	= Solar radiation =		= Solar radiation =
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Albedo.	+
−	*Conduction.	+	* Albedo.
−	*Convection.	+	* Climate change science.
−	*Emissivity.	+	* Conduction.
−	*g-value.	+	* Convection.
−	*Heat transfer.	+	* Emissivity.
−	*Low-e glass.	+	* g-value.
−	*Photovoltaics.	+	* Heat transfer.
−	*Radiant heating.	+	* Low-e glass.
−	*Shading coefficient.	+	* Photovoltaics.
−	*Solar gain.	+	* Radiant heating.
−	*Solar heat gain coefficient.	+	* Shading coefficient.
−	*Solar thermal panels.	+	* Solar gain.
−	*Thermal bridge.	+	* Solar heat gain coefficient.
−	*Thermal optical properties	+	* Solar thermal panels.
−	*U value.	+	* Thermal bridge.
		+	* Thermal optical properties
		+	* U value.

	[[Category:Theory]]		[[Category:Theory]]

Designing Buildings at 11:11, 11 March 2015

2015-03-11T11:11:06Z

← Older revision		Revision as of 11:11, 11 March 2015
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−

	= Introduction =		= Introduction =
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	The range of terrestrial temperatures experienced within the built environment is relatively small, and relative to the temperature of the sun this range is ‘cold’ and so radiating at a ‘long’ wavelength compared to the sun. This anomaly allows us to categorise thermal radiation as short-wave solar radiation and terrestrial or long wave infra-red radiation.		The range of terrestrial temperatures experienced within the built environment is relatively small, and relative to the temperature of the sun this range is ‘cold’ and so radiating at a ‘long’ wavelength compared to the sun. This anomaly allows us to categorise thermal radiation as short-wave solar radiation and terrestrial or long wave infra-red radiation.

−	[[File:Thermal wavelengths of the electromagnetic spectrum.jpg]]	+	[[File:Thermal wavelengths of the electromagnetic spectrum.jpg\|RTENOTITLE]]

	= Solar radiation =		= Solar radiation =
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	*Low-e glass.		*Low-e glass.
	*Photovoltaics.		*Photovoltaics.
		+	*Radiant heating.
	*Shading coefficient.		*Shading coefficient.
	*Solar gain.		*Solar gain.