Solar transmittance through building fabric (gtot) - Revision history

Designing Buildings at 08:00, 23 December 2020

2020-12-23T08:00:09Z

← Older revision		Revision as of 08:00, 23 December 2020
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	* U value.		* U value.

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

Designing Buildings at 09:00, 10 April 2020

2020-04-10T09:00:46Z

← Older revision		Revision as of 09:00, 10 April 2020
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	Two methods are used for calculating the gtot of a solar protection device:		Two methods are used for calculating the gtot of a solar protection device:

−	* Simplified method of EN 13363-1: Calculates approximate values for the gtot of glazing and shading combined, using the solar integrated optical and thermal parameters. This can be calculated easily in a spreadsheet.
−	* Detailed method of EN 13363-2: Calculates more precise values using spectral transmission and reflection data. This requires specialised software.
	* Simplified calculation method: EN ISO 52022-1 (replacing EN 13363-1)		* Simplified calculation method: EN ISO 52022-1 (replacing EN 13363-1)
	* Detailed calculation method: EN ISO 52022-3 (replacing EN 13363-2)		* Detailed calculation method: EN ISO 52022-3 (replacing EN 13363-2)
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	* U value.		* U value.

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

188.66.92.177 at 07:49, 10 April 2020

2020-04-10T07:49:46Z

← Older revision		Revision as of 07:49, 10 April 2020
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	* Simplified method of EN 13363-1: Calculates approximate values for the gtot of glazing and shading combined, using the solar integrated optical and thermal parameters. This can be calculated easily in a spreadsheet.		* Simplified method of EN 13363-1: Calculates approximate values for the gtot of glazing and shading combined, using the solar integrated optical and thermal parameters. This can be calculated easily in a spreadsheet.
	* Detailed method of EN 13363-2: Calculates more precise values using spectral transmission and reflection data. This requires specialised software.		* Detailed method of EN 13363-2: Calculates more precise values using spectral transmission and reflection data. This requires specialised software.
		+	* Simplified calculation method: EN ISO 52022-1 (replacing EN 13363-1)
		+	* Detailed calculation method: EN ISO 52022-3 (replacing EN 13363-2)

	= Find out more =		= Find out more =

Designing Buildings: moved Solar transmittance (gtot) to Solar transmittance through building fabric (gtot)

2018-06-16T08:46:02Z

moved Solar transmittance (gtot) to Solar transmittance through building fabric (gtot)

← Older revision

Revision as of 08:46, 16 June 2018

Designing Buildings at 14:09, 8 February 2018

2018-02-08T14:09:01Z

← Older revision		Revision as of 14:09, 8 February 2018
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	The total solar heat transmittance into a space is the sum of the solar heat that is transmitted directly through its fabric (such as solar radiation transmitting through glass), and the solar heat that is absorbed by its fabric and then re-emitted into the enclosed space.		The total solar heat transmittance into a space is the sum of the solar heat that is transmitted directly through its fabric (such as solar radiation transmitting through glass), and the solar heat that is absorbed by its fabric and then re-emitted into the enclosed space.

−	Total solar energy transmittance (gtot)~~, also referred to as 'solar factor',~~ relates to the performance of solar protection devices such as blinds and shutters and is the percentage of solar energy incident on the fabric of a blind or shutter that is transmitted to the interior of the building, including both the transmittance of the solar protection device itself and of the glazing.	+	Total solar energy transmittance (gtot) relates to the performance of solar protection devices such as blinds and shutters and is the percentage of solar energy incident on the fabric of a blind or shutter that is transmitted to the interior of the building, including both the transmittance of the solar protection device itself and of the glazing.

	According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the incident solar radiation is transmitted.		According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the incident solar radiation is transmitted.

Designing Buildings at 14:05, 8 February 2018

2018-02-08T14:05:39Z

← Older revision		Revision as of 14:05, 8 February 2018
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	Solar heat gain in buildings can be beneficial in the winter, as it reduces the need for heating, but in the summer it can cause overheating.		Solar heat gain in buildings can be beneficial in the winter, as it reduces the need for heating, but in the summer it can cause overheating.

−	The total solar heat transmittance into a space is the sum of the solar heat that is transmitted through its fabric ~~directly~~ (such as solar radiation transmitting through glass), and the solar heat that is absorbed by its fabric and then re-emitted into the enclosed space.	+	The total solar heat transmittance into a space is the sum of the solar heat that is transmitted directly through its fabric (such as solar radiation transmitting through glass), and the solar heat that is absorbed by its fabric and then re-emitted into the enclosed space.

−	Total solar energy transmittance (gtot), also referred to as 'solar factor', relates to the performance of solar protection devices such as blinds and shutters and is the percentage of solar energy incident on the fabric of a blind or shutter that is transmitted to the interior of the building.	+	Total solar energy transmittance (gtot), also referred to as 'solar factor', relates to the performance of solar protection devices such as blinds and shutters and is the percentage of solar energy incident on the fabric of a blind or shutter that is transmitted to the interior of the building, including both the transmittance of the solar protection device itself and of the glazing.

	According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the incident solar radiation is transmitted.		According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the incident solar radiation is transmitted.

Designing Buildings at 14:03, 8 February 2018

2018-02-08T14:03:27Z

← Older revision		Revision as of 14:03, 8 February 2018
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−	~~Solar transmittance is important for determining the solar heat gain into an enclosed space during sunny conditions.~~ Solar heat gain can be beneficial in the winter, as it reduces the need for heating, but in the summer it can cause overheating.	+	Solar heat gain in buildings can be beneficial in the winter, as it reduces the need for heating, but in the summer it can cause overheating.

−	The total solar heat transmittance is ~~equal to~~ the solar heat that is transmitted through ~~the material~~ directly, ~~plus~~ the solar heat that is absorbed by ~~the material~~ and then re-emitted into the enclosed space.	+	The total solar heat transmittance into a space is the sum of the solar heat that is transmitted through its fabric directly (such as solar radiation transmitting through glass), and the solar heat that is absorbed by its fabric and then re-emitted into the enclosed space.

−	~~The total~~ solar energy transmittance (gtot), also referred to as solar factor, is the percentage of ~~the~~ solar energy that is transmitted ~~into~~ the ~~room. The g-value is the solar factor~~ of ~~just~~ the ~~glazing, whereas ‘gtot’ is the solar factor of the glazing and solar protection device combined~~.	+	Total solar energy transmittance (gtot), also referred to as 'solar factor', relates to the performance of solar protection devices such as blinds and shutters and is the percentage of solar energy incident on the fabric of a blind or shutter that is transmitted to the interior of the building.

−	According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the radiation is transmitted.	+	According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the incident solar radiation is transmitted.

	Two methods are used for calculating the gtot of a solar protection device:		Two methods are used for calculating the gtot of a solar protection device:

−	* Simplified method of EN 13363-1: Calculates approximate values for the gtot of glazing and shading combined, using the solar integrated optical and thermal parameters. ~~Can~~ be calculated easily in a spreadsheet.	+	* Simplified method of EN 13363-1: Calculates approximate values for the gtot of glazing and shading combined, using the solar integrated optical and thermal parameters. This can be calculated easily in a spreadsheet.
−	* Detailed method of EN 13363-2: Calculates more precise values using spectral transmission and reflection data. ~~Requires~~ specialised software.	+	* Detailed method of EN 13363-2: Calculates more precise values using spectral transmission and reflection data. This requires specialised software.

	= Find out more =		= Find out more =

Editor: Created page with "Solar transmittance is important for determining the solar heat gain into an enclosed space during sunny conditions. Solar heat gain can be beneficial in the winter, as it reduce..."

2018-02-08T12:51:41Z

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Solar transmittance is important for determining the solar heat gain into an enclosed space during sunny conditions. Solar heat gain can be beneficial in the winter, as it reduces the need for heating, but in the summer it can cause overheating.

The total solar heat transmittance is equal to the solar heat that is transmitted through the material directly, plus the solar heat that is absorbed by the material and then re-emitted into the enclosed space.

The total solar energy transmittance (gtot), also referred to as solar factor, is the percentage of the solar energy that is transmitted into the room. The g-value is the solar factor of just the glazing, whereas ‘gtot’ is the solar factor of the glazing and solar protection device combined.

According to the EN 14501 standard (Blinds and Shutters, Thermal and Visual Comfort, Performance Characteristics and Classification), it is measured on an index of 0 to 1. The closer the fabric’s index is to 0, the more efficient it is at protecting against heat and reducing solar energy; whereas an index of 1 means that all the radiation is transmitted.

Two methods are used for calculating the gtot of a solar protection device:

* Simplified method of EN 13363-1: Calculates approximate values for the gtot of glazing and shading combined, using the solar integrated optical and thermal parameters. Can be calculated easily in a spreadsheet.
* Detailed method of EN 13363-2: Calculates more precise values using spectral transmission and reflection data. Requires specialised software.

= Find out more =

=== Related articles on Designing Buildings Wiki ===

* Choosing Blind Fabric for Performance.
* Emissivity.
* g-value.
* Light reflectance value.
* Preventing overheating.
* Shading coefficient.
* Solar gain.
* Solar heat gain coefficient.
* Solar reflectance index.
* Thermal bridge.
* Thermal optical properties.
* U value.

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