Thermal admittance of building materials - Revision history

Designing Buildings at 09:34, 28 September 2020

2020-09-28T09:34:54Z

← Older revision		Revision as of 09:34, 28 September 2020
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	* The Concrete Centre: Thermal Mass Explained (2012 update).		* The Concrete Centre: Thermal Mass Explained (2012 update).

−	[[Category:~~Standards_/_measurements~~]] [[Category:DCN_Standard]]	+	[[Category:DCN_Definition]] [[Category:DCN_Guidance]] [[Category:DCN_Standard]] [[Category:Standards_/_measurements]]

Editor at 17:34, 19 February 2019

2019-02-19T17:34:33Z

← Older revision		Revision as of 17:34, 19 February 2019
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	As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to 100 mm into materials such as concrete and masonry.		As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to 100 mm into materials such as concrete and masonry.

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

	* g-value.		* g-value.
		+	* Heat gain.
	* Insulation.		* Insulation.
	* k-value.		* k-value.
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	* U-value.		* U-value.

−	=== External references. ===	+	= External references. =

	* ISO 13786:2007. [http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40892 Thermal performance of building components -- Dynamic thermal characteristics -- Calculation methods].		* ISO 13786:2007. [http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40892 Thermal performance of building components -- Dynamic thermal characteristics -- Calculation methods].
	* The Concrete Centre: Thermal Mass Explained (2012 update).		* The Concrete Centre: Thermal Mass Explained (2012 update).

−	[[Category:Standards_/_measurements]]	+	[[Category:Standards_/_measurements]] [[Category:DCN_Standard]]

Editor at 15:27, 16 February 2018

2018-02-16T15:27:11Z

← Older revision		Revision as of 15:27, 16 February 2018
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	Thermal admittance is calculated as the heat transfer (in watts W) / area (m^2) x the temperature difference between the surface of the material and the air.		Thermal admittance is calculated as the heat transfer (in watts W) / area (m^2) x the temperature difference between the surface of the material and the air.

−	Typical admittance values based on a 24-hour cycle might range from 1.0 for a timber frame wall with brick outer leaf, to 2.65 for a cavity wall with ~~100mm~~ dense aggregate block (ref The Concrete Centre).	+	Typical admittance values based on a 24-hour cycle might range from 1.0 for a timber frame wall with brick outer leaf, to 2.65 for a cavity wall with 100 mm dense aggregate block (ref. The Concrete Centre).

	The admittance time lead, ω (expressed in hours), is a measure of the time delay between the peak heat flow between the material surface and the space and the time of the peak temperature in the space.		The admittance time lead, ω (expressed in hours), is a measure of the time delay between the peak heat flow between the material surface and the space and the time of the peak temperature in the space.
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	Admittance is dependant primarily on a material's density, thermal capacity, thermal conductivity, surface resistance and the time cycle of the temperature variation.		Admittance is dependant primarily on a material's density, thermal capacity, thermal conductivity, surface resistance and the time cycle of the temperature variation.

−	As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to ~~100mm~~ into materials such as concrete and masonry.	+	As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to 100 mm into materials such as concrete and masonry.

	= Find out more =		= Find out more =
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	* k-value.		* k-value.
	* Thermal mass.		* Thermal mass.
		+	* Thermal resistance.
	* U-value.		* U-value.

Designing Buildings at 11:13, 5 July 2016

2016-07-05T11:13:11Z

← Older revision		Revision as of 11:13, 5 July 2016
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−
	Thermal admittance (Y) is a measure a material's ability to absorb heat from, and release it to, a space over time. This can be used as an indicator of the thermal storage capacity (thermal mass) of a material, absorbing heat from and releasing it to a space through cyclical temperature variations, thus evening out temperature variations and so reducing the demand on building services systems.		Thermal admittance (Y) is a measure a material's ability to absorb heat from, and release it to, a space over time. This can be used as an indicator of the thermal storage capacity (thermal mass) of a material, absorbing heat from and releasing it to a space through cyclical temperature variations, thus evening out temperature variations and so reducing the demand on building services systems.

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	The admittance time lead, ω (expressed in hours), is a measure of the time delay between the peak heat flow between the material surface and the space and the time of the peak temperature in the space.		The admittance time lead, ω (expressed in hours), is a measure of the time delay between the peak heat flow between the material surface and the space and the time of the peak temperature in the space.

−	Admittance is dependant primarily on a ~~material’s~~ density, thermal capacity, thermal conductivity, surface resistance and the time cycle of the temperature variation.	+	Admittance is dependant primarily on a material's density, thermal capacity, thermal conductivity, surface resistance and the time cycle of the temperature variation.

	As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to 100mm into materials such as concrete and masonry.		As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to 100mm into materials such as concrete and masonry.
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	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*g-value.	+
−	*Insulation.	+	* g-value.
−	*k-value.	+	* Insulation.
−	*Thermal mass.	+	* k-value.
−	*U-value.	+	* Thermal mass.
		+	* U-value.

	=== External references. ===		=== External references. ===
−	*ISO 13786:2007. [http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40892 Thermal performance of building components -- Dynamic thermal characteristics -- Calculation methods].	+
−	*The Concrete Centre: ~~[http://www.concretecentre.com/online_services/publication_library/publication_details.aspx?PublicationId=781~~ Thermal Mass Explained (2012 update)].	+	* ISO 13786:2007. [http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40892 Thermal performance of building components -- Dynamic thermal characteristics -- Calculation methods].
		+	* The Concrete Centre: Thermal Mass Explained (2012 update).

	[[Category:Standards_/_measurements]]		[[Category:Standards_/_measurements]]

Designing Buildings: moved Thermal admittance to Thermal admittance of building materials

2015-03-05T10:04:01Z

moved Thermal admittance to Thermal admittance of building materials

← Older revision

Revision as of 10:04, 5 March 2015

Designing Buildings at 15:28, 8 July 2014

2014-07-08T15:28:04Z

← Older revision		Revision as of 15:28, 8 July 2014
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	*The Concrete Centre: [http://www.concretecentre.com/online_services/publication_library/publication_details.aspx?PublicationId=781 Thermal Mass Explained (2012 update)].		*The Concrete Centre: [http://www.concretecentre.com/online_services/publication_library/publication_details.aspx?PublicationId=781 Thermal Mass Explained (2012 update)].

−	[[Category:~~Sustainability]]~~	+	[[Category:Standards_/_measurements]]
−	~~[[Category:Theory~~]]	+

Designing Buildings: Created page with " Thermal admittance (Y) is a measure a material's ability to absorb heat from, and release it to, a space over time. This can be used as an indicator of the thermal storage capac..."

2014-03-04T12:07:31Z

Created page with " Thermal admittance (Y) is a measure a material's ability to absorb heat from, and release it to, a space over time. This can be used as an indicator of the thermal storage capac..."

New page

Thermal admittance (Y) is a measure a material's ability to absorb heat from, and release it to, a space over time. This can be used as an indicator of the thermal storage capacity (thermal mass) of a material, absorbing heat from and releasing it to a space through cyclical temperature variations, thus evening out temperature variations and so reducing the demand on building services systems.

Thermal admittance is expressed in W/(m^2K), where the higher the admittance value, the higher the thermal storage capacity.

Thermal admittance is calculated as the heat transfer (in watts W) / area (m^2) x the temperature difference between the surface of the material and the air.

Typical admittance values based on a 24-hour cycle might range from 1.0 for a timber frame wall with brick outer leaf, to 2.65 for a cavity wall with 100mm dense aggregate block (ref The Concrete Centre).

The admittance time lead, ω (expressed in hours), is a measure of the time delay between the peak heat flow between the material surface and the space and the time of the peak temperature in the space.

Admittance is dependant primarily on a material’s density, thermal capacity, thermal conductivity, surface resistance and the time cycle of the temperature variation.

As the thickness of a material increases, so the admittance approaches a constant value. It is generally considered that in the UK, with a 24-hour thermal cycle, heat energy can only penetrate up to 100mm into materials such as concrete and masonry.

= Find out more =

=== Related articles on Designing Buildings Wiki ===
*g-value.
*Insulation.
*k-value.
*Thermal mass.
*U-value.

=== External references. ===
*ISO 13786:2007. [http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=40892 Thermal performance of building components -- Dynamic thermal characteristics -- Calculation methods].
*The Concrete Centre: [http://www.concretecentre.com/online_services/publication_library/publication_details.aspx?PublicationId=781 Thermal Mass Explained (2012 update)].

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