K-value thermal conductivity - Revision history

Designing Buildings at 10:39, 4 September 2020

2020-09-04T10:39:07Z

← Older revision		Revision as of 10:39, 4 September 2020
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	* U-value.		* U-value.

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

Designing Buildings: moved K-value to K-value thermal conductivity

2020-05-22T08:04:02Z

moved K-value to K-value thermal conductivity

← Older revision

Revision as of 08:04, 22 May 2020

Editor at 17:33, 19 February 2019

2019-02-19T17:33:14Z

← Older revision		Revision as of 17:33, 19 February 2019
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	NB: Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per sq. m of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.		NB: Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per sq. m of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.

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

	* g-value.		* g-value.
		+	* Heat gain.
	* kappa value.		* kappa value.
	* R-value.		* R-value.
Line 25:		Line 24:
	* U-value.		* U-value.

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

Editor at 15:26, 16 February 2018

2018-02-16T15:26:45Z

← Older revision		Revision as of 15:26, 16 February 2018
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−
	For an alternative meaning, see kappa value.		For an alternative meaning, see kappa value.

−	----	+	-----
−		+
	A k-value (sometimes referred to as a k-factor or lambda value λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. It is a fundamental property, independent of the quantity of material. It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK.		A k-value (sometimes referred to as a k-factor or lambda value λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. It is a fundamental property, independent of the quantity of material. It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK.

Line 12:		Line 10:
	U-values (sometimes mistakenly thought to be the reciprocal of R-values) describe the thermal conductivity of an entire building element, including its internal and external surfaces. They can be calculated as 1 / (the sum of the resistances of the various layers of the element (its R-values) + the resistance of the internal and external surfaces of the element). U-values are measured in W/m2K.		U-values (sometimes mistakenly thought to be the reciprocal of R-values) describe the thermal conductivity of an entire building element, including its internal and external surfaces. They can be calculated as 1 / (the sum of the resistances of the various layers of the element (its R-values) + the resistance of the internal and external surfaces of the element). U-values are measured in W/m2K.

−	NB Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per ~~square metre~~ of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.	+	NB: Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per sq. m of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.

	= Find out more =		= Find out more =

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*g-value.	+
−	*kappa value.	+	* g-value.
−	*R-value.	+	* kappa value.
−	*Shading coefficient.	+	* R-value.
−	*Solar heat gain coefficient.	+	* Shading coefficient.
−	*Thermal mass.	+	* Solar heat gain coefficient.
−	*U-value.	+	* Thermal mass.
		+	* Thermal resistance.
		+	* U-value.

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

Designing Buildings: Reverted edits by 195.195.140.13 (talk) to last revision by Designing Buildings

2017-03-23T17:48:27Z

Reverted edits by 195.195.140.13 (talk) to last revision by Designing Buildings

← Older revision		Revision as of 17:48, 23 March 2017
Line 1:		Line 1:
−	~~Krack Value lol~~

−	~~=== Related articles on Designing Buildings Wiki ===~~	+	For an alternative meaning, see kappa value.

−	* g-value.	+	----
−	* kappa value.	+
−	* R-value.	+	A k-value (sometimes referred to as a k-factor or lambda value λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. It is a fundamental property, independent of the quantity of material. It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK.
−	* Shading coefficient.	+
−	* Solar heat gain coefficient.	+	k-values can be used to compare the thermal conductivities of different materials. Typically this is important in assessing the potential for heat transfer between the inside and outside of a building.
−	* Thermal mass.	+
−	* U-value.	+	The thermal resistance of a specific thickness of a material (its R-value) can be calculated by dividing the thickness of the material (in metres) by its k-value. R-values are therefore expressed in m2K/W (or ft2·°F·hr/Btu in the USA). The overall R-value of a multi-layered element can be calculated by adding the R-values of its component materials.
		+
		+	U-values (sometimes mistakenly thought to be the reciprocal of R-values) describe the thermal conductivity of an entire building element, including its internal and external surfaces. They can be calculated as 1 / (the sum of the resistances of the various layers of the element (its R-values) + the resistance of the internal and external surfaces of the element). U-values are measured in W/m2K.
		+
		+	NB Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per square metre of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.
		+
		+	= Find out more =
		+
		+	=== Related articles on Designing Buildings Wiki ===
		+	*g-value.
		+	*kappa value.
		+	*R-value.
		+	*Shading coefficient.
		+	*Solar heat gain coefficient.
		+	*Thermal mass.
		+	*U-value.

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

195.195.140.13 at 15:38, 23 March 2017

2017-03-23T15:38:14Z

← Older revision		Revision as of 15:38, 23 March 2017
Line 1:		Line 1:
		+	Krack Value lol

−	~~For an alternative meaning, see kappa value.~~	+	=== Related articles on Designing Buildings Wiki ===

−	~~----~~	+	* g-value.
−		+	* kappa value.
−	A k-value (sometimes referred to as a k-factor or lambda value λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. It is a fundamental property, independent of the quantity of material. It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK.	+	* R-value.
−		+	* Shading coefficient.
−	k-values can be used to compare the thermal conductivities of different materials. Typically this is important in assessing the potential for heat transfer between the inside and outside of a building.	+	* Solar heat gain coefficient.
−		+	* Thermal mass.
−	The thermal resistance of a specific thickness of a material (its R-value) can be calculated by dividing the thickness of the material (in metres) by its k-value. R-values are therefore expressed in m2K/W (or ft2·°F·hr/Btu in the USA). The overall R-value of a multi-layered element can be calculated by adding the R-values of its component materials.	+	* U-value.
−		+
−	U-values (sometimes mistakenly thought to be the reciprocal of R-values) describe the thermal conductivity of an entire building element, including its internal and external surfaces. They can be calculated as 1 / (the sum of the resistances of the various layers of the element (its R-values) + the resistance of the internal and external surfaces of the element). U-values are measured in W/m2K.	+
−		+
−	NB Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per square metre of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.	+
−		+
−	~~= Find out more =~~	+
−		+
−	~~=== Related articles on Designing Buildings Wiki ===~~	+
−	*g-value.	+
−	*kappa value.	+
−	*R-value.	+
−	*Shading coefficient.	+
−	*Solar heat gain coefficient.	+
−	*Thermal mass.	+
−	*U-value.	+

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

Designing Buildings at 15:38, 8 July 2014

2014-07-08T15:38:29Z

← Older revision		Revision as of 15:38, 8 July 2014
Line 25:		Line 25:
	*U-value.		*U-value.

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

Designing Buildings at 15:25, 5 March 2014

2014-03-05T15:25:34Z

← Older revision		Revision as of 15:25, 5 March 2014
Line 1:		Line 1:
		+
		+	For an alternative meaning, see kappa value.
		+
		+	----

	A k-value (sometimes referred to as a k-factor or lambda value λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. It is a fundamental property, independent of the quantity of material. It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK.		A k-value (sometimes referred to as a k-factor or lambda value λ) is a measure of the thermal conductivity of a material, that is, how easily heat passes across it. It is a fundamental property, independent of the quantity of material. It represents the steady-state heat flow through a unit area of a material resulting from a temperature gradient perpendicular to that unit area. It is expressed in W/mK.
Line 14:		Line 18:
	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
	*g-value.		*g-value.
		+	*kappa value.
	*R-value.		*R-value.
	*Shading coefficient.		*Shading coefficient.

Designing Buildings at 14:00, 5 March 2014

2014-03-05T14:00:38Z

← Older revision		Revision as of 14:00, 5 March 2014
Line 7:		Line 7:

	U-values (sometimes mistakenly thought to be the reciprocal of R-values) describe the thermal conductivity of an entire building element, including its internal and external surfaces. They can be calculated as 1 / (the sum of the resistances of the various layers of the element (its R-values) + the resistance of the internal and external surfaces of the element). U-values are measured in W/m2K.		U-values (sometimes mistakenly thought to be the reciprocal of R-values) describe the thermal conductivity of an entire building element, including its internal and external surfaces. They can be calculated as 1 / (the sum of the resistances of the various layers of the element (its R-values) + the resistance of the internal and external surfaces of the element). U-values are measured in W/m2K.
		+
		+	NB Rather confusingly, in the Standard Assessment Procedure (SAP) and Simplified Building Energy Model (SBEM), used to demonstrate compliance with Part L of the building regulations, k-value (short for Kappa value) refers to the heat capacity per square metre of a material, measured in kJ/m2K. This is used to quantify the thermal mass of building elements such as walls and floors.

	= Find out more =		= Find out more =
Line 15:		Line 17:
	*Shading coefficient.		*Shading coefficient.
	*Solar heat gain coefficient.		*Solar heat gain coefficient.
		+	*Thermal mass.
	*U-value.		*U-value.

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

Designing Buildings at 13:11, 2 January 2014

2014-01-02T13:11:41Z

← Older revision		Revision as of 13:11, 2 January 2014
Line 11:		Line 11:

	=== Related articles on Designing Buildings Wiki ===		=== Related articles on Designing Buildings Wiki ===
−	*	+	*g-value.
−	g-value.	+
	*R-value.		*R-value.
	*Shading coefficient.		*Shading coefficient.