Decrement delay - Revision history

Designing Buildings at 08:48, 27 October 2020

2020-10-27T08:48:40Z

← Older revision		Revision as of 08:48, 27 October 2020
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	The term ‘decrement delay’ refers to the time it takes for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken to be the delay in hours between the peak temperature of the outer surface of the element on a summer day and the resulting peak temperature of the internal surface.		The term ‘decrement delay’ refers to the time it takes for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken to be the delay in hours between the peak temperature of the outer surface of the element on a summer day and the resulting peak temperature of the internal surface.

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	To reduce summer overheating, a low decrement factor is required, and a decrement delay of 6 to 12 hours.		To reduce summer overheating, a low decrement factor is required, and a decrement delay of 6 to 12 hours.

−	= ~~Find out more<br/>~~ =	+	= Related articles on Designing Buildings Wiki =

−	~~=== Related articles on Designing Buildings Wiki ===~~	+	* Computational fluid dynamics.
−	*Computational fluid dynamics.~~<br/>~~	+	* Ground energy options.
−	*Ground energy options.	+	* Insulation.
−	*Insulation.	+	* k-value.
−	*k-value.	+	* Kappa value.
−	*Kappa value.	+	* Specific heat capacity.
−	*Specific heat capacity.	+	* Stack effect.
−	*Stack effect.	+	* Thermal admittance.
−	*Thermal admittance.	+	* Thermal labyrinth.
−	*Thermal labyrinth.	+	* Thermal mass.
−	*Thermal mass.	+	* U-value.
−	*U-value.	+

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

Designing Buildings at 15:21, 8 July 2014

2014-07-08T15:21:31Z

← Older revision		Revision as of 15:21, 8 July 2014
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	*U-value.		*U-value.

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

Designing Buildings at 18:03, 5 March 2014

2014-03-05T18:03:59Z

← Older revision		Revision as of 18:03, 5 March 2014
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−	The term ‘decrement delay’ refers to the time it takes ~~in hours~~ for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken to be the delay between the peak temperature of the outer surface of the element on a summer day and the resulting peak temperature of the internal surface.	+	The term ‘decrement delay’ refers to the time it takes for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken to be the delay in hours between the peak temperature of the outer surface of the element on a summer day and the resulting peak temperature of the internal surface.

−	This concept reflects increasing awareness that the thermal behaviour of buildings is dynamic, rather than static, and that thermal mass, as well as thermal insulation, has a significant impact on the energy efficiency of a building. For example, two buildings with identical u-values may perform very differently depending on their decrement delay, with a longer delay likely to reduce peak loads on building services systems.	+	This concept reflects increasing awareness that the thermal behaviour of buildings is dynamic, rather than static, and that thermal mass, as well as thermal insulation, has a significant impact on the energy efficiency of a building. For example, two buildings with identical U-values may perform very differently depending on their decrement delay, with a longer delay likely to reduce peak loads on building services systems.

	Materials with a low lambda value (sometimes referred to as thermal conductivity or k-value), high specific heat capacity and high density will tend to have a high decrement delay.		Materials with a low lambda value (sometimes referred to as thermal conductivity or k-value), high specific heat capacity and high density will tend to have a high decrement delay.
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	*k-value.		*k-value.
	*Kappa value.		*Kappa value.
		+	*Specific heat capacity.
	*Stack effect.		*Stack effect.
	*Thermal admittance.		*Thermal admittance.

Designing Buildings: Created page with " The term ‘decrement delay’ refers to the time it takes in hours for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken..."

2014-03-05T18:02:04Z

Created page with " The term ‘decrement delay’ refers to the time it takes in hours for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken..."

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The term ‘decrement delay’ refers to the time it takes in hours for heat to pass through an element of a building (such as an external wall or roof). Typically this is taken to be the delay between the peak temperature of the outer surface of the element on a summer day and the resulting peak temperature of the internal surface.

This concept reflects increasing awareness that the thermal behaviour of buildings is dynamic, rather than static, and that thermal mass, as well as thermal insulation, has a significant impact on the energy efficiency of a building. For example, two buildings with identical u-values may perform very differently depending on their decrement delay, with a longer delay likely to reduce peak loads on building services systems.

Materials with a low lambda value (sometimes referred to as thermal conductivity or k-value), high specific heat capacity and high density will tend to have a high decrement delay.

The term ‘decrement factor’ refers to the amount by which conditions are moderated by an element of a building. So in the case of the peak temperature on the outer surface of a building on a summer day, this would be the amount by which the peak is reduced by the time it reaches the inner surface. It is expressed as the ratio between the internal surface cyclic temperature variation compared to the external surface.

To reduce summer overheating, a low decrement factor is required, and a decrement delay of 6 to 12 hours.

= Find out more<br/> =

=== Related articles on Designing Buildings Wiki ===
*Computational fluid dynamics.<br/>
*Ground energy options.
*Insulation.
*k-value.
*Kappa value.
*Stack effect.
*Thermal admittance.
*Thermal labyrinth.
*Thermal mass.
*U-value.

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