Phase change in buildings - Revision history

Designing Buildings at 08:30, 16 November 2020

2020-11-16T08:30:07Z

← Older revision		Revision as of 08:30, 16 November 2020
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	* Thermal mass.		* Thermal mass.

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

Designing Buildings at 07:59, 3 May 2019

2019-05-03T07:59:47Z

← Older revision		Revision as of 07:59, 3 May 2019
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−	~~To help develop this article, click ‘Edit this article’ above.~~
−
−	~~-----~~
	Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.		Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.

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	See phase change materials for more information.		See phase change materials for more information.

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

	* Advanced phase change materials.		* Advanced phase change materials.
		+	* Advanced phase change materials industry.
	* Heat transfer.		* Heat transfer.
	* Thermal comfort.		* Thermal comfort.

Designing Buildings at 09:19, 9 November 2016

2016-11-09T09:19:32Z

← Older revision		Revision as of 09:19, 9 November 2016
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	* Gross calorific value.		* Gross calorific value.
	* Insulation.		* Insulation.
		+	* Latent heat.
	* Mass transfer.		* Mass transfer.
	* Phase change materials.		* Phase change materials.

Designing Buildings at 07:21, 9 November 2016

2016-11-09T07:21:58Z

← Older revision		Revision as of 07:21, 9 November 2016
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	* Conduction.		* Conduction.
	* Convection.		* Convection.
		+	* Gross calorific value.
	* Insulation.		* Insulation.
	* Mass transfer.		* Mass transfer.

Designing Buildings at 14:51, 22 March 2016

2016-03-22T14:51:59Z

← Older revision		Revision as of 14:51, 22 March 2016
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−
	To help develop this article, click ‘Edit this article’ above.		To help develop this article, click ‘Edit this article’ above.

−	----	+	-----
−		+
	Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.		Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.

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	See refrigerants and heat pumps for more information.		See refrigerants and heat pumps for more information.

−	A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads.~~<br/>~~	+	A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads.

	Phase change materials used in buildings will typically melt and solidify within a range of 18-30ºC. They are able to store up to 14 times more thermal energy per unit volume than conventional thermal storage materials.		Phase change materials used in buildings will typically melt and solidify within a range of 18-30ºC. They are able to store up to 14 times more thermal energy per unit volume than conventional thermal storage materials.
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*Heat transfer.
−	*Thermal comfort.
−	*Thermal mass.
−	*Building services.
−	*Conduction.
−	*Convection.
−	*Insulation.
−	*Mass transfer.
−	*Phase change materials.
−	*Refrigerants.
−	*Solar gain.
−	*Thermal optical properties.
−	*Thermal mass.

−	[[Category:Theory]]	+	* Advanced phase change materials.
−	[[Category:Design]]	+	* Heat transfer.
		+	* Thermal comfort.
		+	* Thermal mass.
		+	* Building services.
		+	* Conduction.
		+	* Convection.
		+	* Insulation.
		+	* Mass transfer.
		+	* Phase change materials.
		+	* Refrigerants.
		+	* Solar gain.
		+	* Thermal optical properties.
		+	* Thermal mass.
		+
		+	[[Category:Theory]] [[Category:Design]]

Designing Buildings at 10:39, 8 November 2014

2014-11-08T10:39:42Z

← Older revision		Revision as of 10:39, 8 November 2014
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	See refrigerants and heat pumps for more information.		See refrigerants and heat pumps for more information.

−	A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads. <br/>	+	A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads.<br/>

−	Phase change materials used in buildings will typically melt and solidify within a range of 18-30ºC. They are able to store up to 14 times more thermal energy per unit volume than conventional thermal storage materials.	+	Phase change materials used in buildings will typically melt and solidify within a range of 18-30ºC. They are able to store up to 14 times more thermal energy per unit volume than conventional thermal storage materials.

	See phase change materials for more information.		See phase change materials for more information.
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	*Convection.		*Convection.
	*Insulation.		*Insulation.
		+	*Mass transfer.
	*Phase change materials.		*Phase change materials.
	*Refrigerants.		*Refrigerants.

Designing Buildings at 09:57, 29 October 2014

2014-10-29T09:57:19Z

← Older revision		Revision as of 09:57, 29 October 2014
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−

	To help develop this article, click ‘Edit this article’ above.		To help develop this article, click ‘Edit this article’ above.
		+
		+	----

	Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.		Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.
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	When systems change phase, they absorb or release significant amounts of heat energy (latent heat, expressed in J/kg). The systems themselves do not change temperature as the energy is consumed or generated by the physical process of changing the state of the system. For example, when water evaporates, it absorbs heat, producing a cooling effect. So when water evaporates from the surface of a building, or when sweat evaporates from the skin, this has a cooling effect. Conversely, when water condenses it releases heat.		When systems change phase, they absorb or release significant amounts of heat energy (latent heat, expressed in J/kg). The systems themselves do not change temperature as the energy is consumed or generated by the physical process of changing the state of the system. For example, when water evaporates, it absorbs heat, producing a cooling effect. So when water evaporates from the surface of a building, or when sweat evaporates from the skin, this has a cooling effect. Conversely, when water condenses it releases heat.

−	This mechanism has been used to cool buildings in hot climates by spraying water over the building fabric, however it is often overlooked in heat transfer and energy use calculations.	+	This mechanism has been used to cool buildings in hot climates by spraying water over the building fabric, however phase change is often overlooked in heat transfer and energy use calculations.

	Phase change is also important in refrigeration, where refrigerant gases absorb heat from the cooling medium (typically water) as they evaporate, and release heat when they condense, which is rejected to the outside (or recovered). The exact opposite of this process is used to generate heat in heat pumps.		Phase change is also important in refrigeration, where refrigerant gases absorb heat from the cooling medium (typically water) as they evaporate, and release heat when they condense, which is rejected to the outside (or recovered). The exact opposite of this process is used to generate heat in heat pumps.
Line 15:		Line 16:
	See refrigerants and heat pumps for more information.		See refrigerants and heat pumps for more information.

−	A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. ~~Phase change materials used in buildings will typically melt~~ and ~~solidify within a range of 18-30ºC~~ and ~~are normally contained in~~ the ~~building fabric~~.	+	A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads. <br/>

−	Phase change materials are able to store 5 to 14 times more thermal energy per unit volume than conventional thermal storage materials~~. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads~~.	+	Phase change materials used in buildings will typically melt and solidify within a range of 18-30ºC. They are able to store up to 14 times more thermal energy per unit volume than conventional thermal storage materials.

	See phase change materials for more information.		See phase change materials for more information.
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	*Heat transfer.		*Heat transfer.
	*Thermal comfort.		*Thermal comfort.
		+	*Thermal mass.
	*Building services.		*Building services.
	*Conduction.		*Conduction.

Designing Buildings: moved Phase change to Phase change in buildings

2014-10-29T09:51:52Z

moved Phase change to Phase change in buildings

← Older revision

Revision as of 09:51, 29 October 2014

Designing Buildings: Created page with " To help develop this article, click ‘Edit this article’ above. Phase change (or phase transition) is the transition of a system from one state of matter to another by heat..."

2014-10-29T09:51:40Z

Created page with " To help develop this article, click ‘Edit this article’ above. Phase change (or phase transition) is the transition of a system from one state of matter to another by heat..."

New page

To help develop this article, click ‘Edit this article’ above.

Phase change (or phase transition) is the transition of a system from one state of matter to another by heat transfer. For example, from a solid to a liquid or from a liquid to a gas.

Phase changes can be a mechanisms for heat transfer in buildings.

When systems change phase, they absorb or release significant amounts of heat energy (latent heat, expressed in J/kg). The systems themselves do not change temperature as the energy is consumed or generated by the physical process of changing the state of the system. For example, when water evaporates, it absorbs heat, producing a cooling effect. So when water evaporates from the surface of a building, or when sweat evaporates from the skin, this has a cooling effect. Conversely, when water condenses it releases heat.

This mechanism has been used to cool buildings in hot climates by spraying water over the building fabric, however it is often overlooked in heat transfer and energy use calculations.

Phase change is also important in refrigeration, where refrigerant gases absorb heat from the cooling medium (typically water) as they evaporate, and release heat when they condense, which is rejected to the outside (or recovered). The exact opposite of this process is used to generate heat in heat pumps.

See refrigerants and heat pumps for more information.

A newly-emerging application of phase change in buildings is the use of phase change materials (PCM). These are generally materials with a large specific latent heat capacity. They can be used in construction to reduce internal temperature changes by storing latent heat in the solid-liquid or liquid-gas phase change of a material. Phase change materials used in buildings will typically melt and solidify within a range of 18-30ºC and are normally contained in the building fabric.

Phase change materials are able to store 5 to 14 times more thermal energy per unit volume than conventional thermal storage materials. Heat is absorbed and released almost isothermally and is used to reduce the energy consumed by conventional heating and cooling systems by reducing peak loads.

See phase change materials for more information.

= Find out more =

=== Related articles on Designing Buildings Wiki ===
*Heat transfer.
*Thermal comfort.
*Building services.
*Conduction.
*Convection.
*Insulation.
*Phase change materials.
*Refrigerants.
*Solar gain.
*Thermal optical properties.
*Thermal mass.

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