Solar shading design - Revision history

Designing Buildings at 05:53, 26 July 2022

2022-07-26T05:53:34Z

← Older revision		Revision as of 05:53, 26 July 2022
Line 35:		Line 35:
	The guide produced by UN Habitat group was written in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces by strategies such as appropriate building orientation (along the east – west axis), adequate sizing of openings (window to wall ratio), proper location of openings (facing north and south), careful selection of glazing properties and appropriate solar protection using sun shading devices. It is an excellent guide to sizing shading devices with learnings that can be applied globally, including for the design and sizing of external shades in the UK.		The guide produced by UN Habitat group was written in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces by strategies such as appropriate building orientation (along the east – west axis), adequate sizing of openings (window to wall ratio), proper location of openings (facing north and south), careful selection of glazing properties and appropriate solar protection using sun shading devices. It is an excellent guide to sizing shading devices with learnings that can be applied globally, including for the design and sizing of external shades in the UK.

−	= Design ~~Data~~ =	+	= Design data =

−	When designing external shades certain information is needed to help estimate the likely shading needs, ~~these include~~ site location ~~( and~~ sun path diagram), facade orientation and height, position of glazing and location within the depth of the wall build-up,heights and locations of surrounding buildings, trees or features. It is also useful to know the internal use of the space, type of windows specified, and the type of ventilation in the space. Many computer programs can incorporate solar analysis to assist in modelling shading devices, however it is also useful to recognise and understand sunpath diagrams and their relationship with shading devices.	+	When designing external shades certain information is needed to help estimate the likely shading needs, this includes site location, sun path diagram, facade orientation and height, position of glazing and location within the depth of the wall build-up,heights and locations of surrounding buildings, trees or features.

−	~~[http://andrewmarsh.com/apps/releases/sunpath2d~~.~~html See~~ also ~~Sun Path generator by Andrew Marsh under external references~~.]	+	It is also useful to know the internal use of the space, type of windows specified, and the type of ventilation in the space. Many computer programmes can incorporate solar analysis to assist in modelling shading devices, however it is also useful to recognise and understand sun path diagrams and their relationship with shading devices.

−	~~= External Links =~~	+	[http://andrewmarsh.com/apps/releases/sunpath2d.html See also Sun Path generator by Andrew Marsh under external references.]

−	~~[https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins]~~	+	= External references =

−	[http://andrewmarsh.com/apps/releases/sunpath2d.html http://andrewmarsh.com/apps/releases/sunpath2d.html]	+	* [https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins]
		+	* [http://andrewmarsh.com/apps/releases/sunpath2d.html http://andrewmarsh.com/apps/releases/sunpath2d.html]

	= Related articles on Designing Buildings =		= Related articles on Designing Buildings =
Line 59:		Line 60:
	* Glare.		* Glare.
	* Louvre (or louver).		* Louvre (or louver).
−	* Marasharabia.
	* Retrofitting solar shading.		* Retrofitting solar shading.
	* Solar gain.		* Solar gain.
Line 67:		Line 67:
	* Thermal comfort.		* Thermal comfort.
	* Urban heat island effect.		* Urban heat island effect.
−	* When hospital buildings aren’t healthy.
−	* Wind Resistance for External Blinds.

	[[Category:DCN_Commentary]] [[Category:DCN_Education_and_Training]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Project_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:DCN_Specification]] [[Category:Projects_and_case_studies]] [[Category:Standards_/_measurements]] [[Category:Sustainability]]		[[Category:DCN_Commentary]] [[Category:DCN_Education_and_Training]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Project_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:DCN_Specification]] [[Category:Projects_and_case_studies]] [[Category:Standards_/_measurements]] [[Category:Sustainability]]

Designing Buildings at 05:51, 26 July 2022

2022-07-26T05:51:41Z

← Older revision		Revision as of 05:51, 26 July 2022
Line 3:		Line 3:
	= Introduction =		= Introduction =

−	External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer~~, accepting that the increase summer temperatures and direct gain in places like the UK mean solar shading is needed is the first step. Designing, sizing and installing is the second step~~.	+	External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer.

−	~~The 2022 building regulations Part O now stipulates~~ the ~~maximum glazed areas for residential buildings with~~ and ~~without cross-ventilation. It also states that buildings~~ in ~~a high-risk locations should provide~~ shading ~~for glazed areas by one of~~ the ~~following means:~~	+	Accepting that the increase summer temperatures and direct gain in places like the UK mean solar shading is needed is the first step. Designing, sizing and installing is the second step.

−	* External shutters with provision for ~~ventilation~~	+	Part O of the building regulations now stipulates the maximum glazed areas for residential buildings with and without cross-ventilation. It also states that buildings in high-risk locations should provide shading for glazed areas by one of the following means:
−	* Glazing with ~~a maximum g~~-~~value of 0~~.~~4 and a minimum light transmittance~~ of ~~0.7~~	+
−	* Overhangs with 50 degrees altitude cut-off on due south-facing façades only	+

−	= External ~~Shutters~~ with ventilation =	+	* External shutters with provision for ventilation.
		+	* Glazing with a maximum g-value of 0.4 and a minimum light transmittance of 0.7.
		+	* Overhangs with 50 degrees altitude cut-off on due south-facing façades only.
		+
		+	= External shutters with ventilation =

	External shutters can vary dramatically in design, mechanism, position and materials, some are solid and also act as security shutters as well as storm shutters, some are louvred and let some light through. In general during the summer shutters are used to reduce the solar heat gain through windows during the day by blocking it externally, then opened later in the day when solar rays are less extreme.		External shutters can vary dramatically in design, mechanism, position and materials, some are solid and also act as security shutters as well as storm shutters, some are louvred and let some light through. In general during the summer shutters are used to reduce the solar heat gain through windows during the day by blocking it externally, then opened later in the day when solar rays are less extreme.

−	See also Brise soleil and articles listed below.	+	See also Brise soleil and the articles listed below.
		+
		+	= Glazing G Value and visual light transmittance =

−	~~= Glazing~~ G Value and ~~Visual Light Transmittance =~~	+	G Value is a factor normally between 0.2 and 0.7, and refers to the percentage of heat that enters through a glass unit to the inside.

−	~~G Value is a factor normally between 0.2-0.7, refers to the % of heat that enters through a glass unit to the inside, whilst Light~~ transmittance or VLT is a factor, normally between 0.5 -0.7 that refers to the % of light that enters a building through ~~the~~ glass~~. For more information visit Frame Factor page on designing buildings or the links below~~.	+	Visual light transmittance or VLT is a factor, normally between 0.5 and 0.7 that refers to the percentage of light that enters a building through glass.

−	See also Frame ~~Factor~~ and articles listed below	+	See also Frame factor and the articles listed below.

	= Overhangs with 50 degree altitude cut-off due South =		= Overhangs with 50 degree altitude cut-off due South =

−	Whilst the building regulations stipulates external overhangs for due South locations, as summer peak temperatures and the intensity of direct solar gain increase the need for East and West shading as well, even in temperate climates ~~can be argued for~~. In the summer of 2022, one of the hottest UK summers on record many buildings in the UK overheated~~, many argue that if~~ the UK had increased levels of external shading this ~~would~~ not be the case. Design possibilities range from fixed overhangs, fins and louvres to adjustable external shading devices and blinds. Getting the design, depth, location and style of external shading devices correct is vital.	+	Whilst the building regulations stipulates external overhangs for due South locations, as summer peak temperatures and the intensity of direct solar gain increase the need for East and West shading as well, even in temperate climates may become beneficial. In the summer of 2022, one of the hottest UK summers on record many buildings in the UK overheated. If the UK had increased levels of external shading this might not be the case. Design possibilities range from fixed overhangs, fins and louvres to adjustable external shading devices and blinds. Getting the design, depth, location and style of external shading devices correct is vital.

	[https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins See also UNHABITAT guide under external references.]		[https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins See also UNHABITAT guide under external references.]

−	The guide produced by UN Habitat group was written in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces ~~through~~ strategies such as appropriate building orientation (along the east – west axis), adequate sizing of openings (window to wall ratio), proper location of openings (facing north and south), careful selection of glazing properties and appropriate solar protection using sun shading devices. It is an excellent guide to sizing shading devices with learnings that can be applied globally, including for the design and sizing of external shades in the UK.	+	The guide produced by UN Habitat group was written in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces by strategies such as appropriate building orientation (along the east – west axis), adequate sizing of openings (window to wall ratio), proper location of openings (facing north and south), careful selection of glazing properties and appropriate solar protection using sun shading devices. It is an excellent guide to sizing shading devices with learnings that can be applied globally, including for the design and sizing of external shades in the UK.

	= Design Data =		= Design Data =

Editor: moved Sizing solar shading to Solar shading design

2022-07-22T09:39:18Z

moved Sizing solar shading to Solar shading design

← Older revision

Revision as of 09:39, 22 July 2022

Editor at 09:02, 22 July 2022

2022-07-22T09:02:41Z

← Older revision		Revision as of 09:02, 22 July 2022
Line 1:		Line 1:
−	[[File:~~UNHABITAT Sun Shade Catalogue Sunpath mix~~.jpg]]	+	[[File:UNHABITAT_Sun_Shade_Catalogue_Sunpath_mix.jpg\|link=File:UNHABITAT_Sun_Shade_Catalogue_Sunpath_mix.jpg]]

	= Introduction =		= Introduction =
Line 55:		Line 55:
	* Glare.		* Glare.
	* Louvre (or louver).		* Louvre (or louver).
		+	* Marasharabia.
	* Retrofitting solar shading.		* Retrofitting solar shading.
	* Solar gain.		* Solar gain.

Editor at 07:35, 22 July 2022

2022-07-22T07:35:38Z

← Older revision		Revision as of 07:35, 22 July 2022
Line 1:		Line 1:
		+	[[File:UNHABITAT Sun Shade Catalogue Sunpath mix.jpg]]
		+
		+	= Introduction =
		+
	External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer, accepting that the increase summer temperatures and direct gain in places like the UK mean solar shading is needed is the first step. Designing, sizing and installing is the second step.		External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer, accepting that the increase summer temperatures and direct gain in places like the UK mean solar shading is needed is the first step. Designing, sizing and installing is the second step.

Line 7:		Line 11:
	* Overhangs with 50 degrees altitude cut-off on due south-facing façades only		* Overhangs with 50 degrees altitude cut-off on due south-facing façades only

−	Getting the design, depth, location and style of you external shading device correct is vital. Whilst it is generally accepted that in hot tropical climates, shading is necessary, until recently the near for shading in more temperate climates like the UK has been debated. In the summer of 2022, one of the hottest UK summers on record many buildings in the UK overheated.	+	= External Shutters with ventilation =

−	~~This guide produced by UN Habitat group was written~~ in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces through strategies such as appropriate building orientation (along the east – west axis), ~~adequate sizing of openings (window to wall ratio)~~, ~~proper location of openings (facing north~~ and ~~south)~~, ~~careful selection of glazing properties~~ and ~~appropriate solar protection using sun shading devices~~. ~~It is an excellent guide~~ to ~~sizing shading devices with learnings that can be applied globally~~, ~~inculding for the design and sizing of external shades~~ in the UK.	+	External shutters can vary dramatically in design, mechanism, position and materials, some are solid and also act as security shutters as well as storm shutters, some are louvred and let some light through. In general during the summer shutters are used to reduce the solar heat gain through windows during the day by blocking it externally, then opened later in the day when solar rays are less extreme.

−	~~= Related~~ articles ~~on Designing Buildings =~~	+	See also Brise soleil and articles listed below.

−	~~Angular selective shading systems.~~	+	= Glazing G Value and Visual Light Transmittance =

−	~~Automated blinds~~.	+	G Value is a factor normally between 0.2-0.7, refers to the % of heat that enters through a glass unit to the inside, whilst Light transmittance or VLT is a factor, normally between 0.5 -0.7 that refers to the % of light that enters a building through the glass. For more information visit Frame Factor page on designing buildings or the links below.

−	~~Blinds.~~	+	See also Frame Factor and articles listed below

−	~~BREEAM Visual comfort Glare control.~~	+	= Overhangs with 50 degree altitude cut-off due South =

−	~~Brise soleil~~.	+	Whilst the building regulations stipulates external overhangs for due South locations, as summer peak temperatures and the intensity of direct solar gain increase the need for East and West shading as well, even in temperate climates can be argued for. In the summer of 2022, one of the hottest UK summers on record many buildings in the UK overheated, many argue that if the UK had increased levels of external shading this would not be the case. Design possibilities range from fixed overhangs, fins and louvres to adjustable external shading devices and blinds. Getting the design, depth, location and style of external shading devices correct is vital.

−	~~Control of solar~~ shading ~~IP 4 17~~.	+	[https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins See also UNHABITAT guide under external references.]

−	~~Daylight lighting systems~~.	+	The guide produced by UN Habitat group was written in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces through strategies such as appropriate building orientation (along the east – west axis), adequate sizing of openings (window to wall ratio), proper location of openings (facing north and south), careful selection of glazing properties and appropriate solar protection using sun shading devices. It is an excellent guide to sizing shading devices with learnings that can be applied globally, including for the design and sizing of external shades in the UK.

−	~~Exterior shutters.~~	+	= Design Data =

−	~~Glare~~.	+	When designing external shades certain information is needed to help estimate the likely shading needs, these include site location ( and sun path diagram), facade orientation and height, position of glazing and location within the depth of the wall build-up,heights and locations of surrounding buildings, trees or features. It is also useful to know the internal use of the space, type of windows specified, and the type of ventilation in the space. Many computer programs can incorporate solar analysis to assist in modelling shading devices, however it is also useful to recognise and understand sunpath diagrams and their relationship with shading devices.

−	~~Louvre (or louver)~~.	+	[http://andrewmarsh.com/apps/releases/sunpath2d.html See also Sun Path generator by Andrew Marsh under external references.]

−	~~Retrofitting solar shading.~~	+	= External Links =

−	~~Solar gain~~.	+	[https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins https://unhabitat.org/sun-shading-catalogue-adequate-shading-sizing-overhangs-and-fins]

−	~~Solar shading of buildings BR 364~~.	+	[http://andrewmarsh.com/apps/releases/sunpath2d.html http://andrewmarsh.com/apps/releases/sunpath2d.html]

−	~~Solar thermal panels.~~	+	= Related articles on Designing Buildings =
−		+
−	~~The daylight factor.~~	+
−		+
−	~~Thermal comfort.~~	+
−		+
−	~~Urban heat island effect.~~	+

−	When hospital buildings aren’t healthy.	+	* Angular selective shading systems.
		+	* Automated blinds.
		+	* Blinds.
		+	* BREEAM Visual comfort Glare control.
		+	* Brise soleil.
		+	* Control of solar shading IP 4 17.
		+	* Daylight lighting systems.
		+	* Exterior shutters.
		+	* Glare.
		+	* Louvre (or louver).
		+	* Retrofitting solar shading.
		+	* Solar gain.
		+	* Solar shading of buildings BR 364.
		+	* Solar thermal panels.
		+	* The daylight factor.
		+	* Thermal comfort.
		+	* Urban heat island effect.
		+	* When hospital buildings aren’t healthy.
		+	* Wind Resistance for External Blinds.

−	~~Wind Resistance for External Blinds.~~	+	[[Category:DCN_Commentary]] [[Category:DCN_Education_and_Training]] [[Category:DCN_Guidance]] [[Category:DCN_Product_Knowledge]] [[Category:DCN_Project_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:DCN_Specification]] [[Category:Projects_and_case_studies]] [[Category:Standards_/_measurements]] [[Category:Sustainability]]

Editor: Created page with "External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer, accepting that the increase summer temperature..."

2022-07-22T06:01:12Z

Created page with "External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer, accepting that the increase summer temperature..."

New page

External shading devices are the most effective mechanism for reducing external heat gain in buildings during the height of summer, accepting that the increase summer temperatures and direct gain in places like the UK mean solar shading is needed is the first step. Designing, sizing and installing is the second step.

The 2022 building regulations Part O now stipulates the maximum glazed areas for residential buildings with and without cross-ventilation. It also states that buildings in a high-risk locations should provide shading for glazed areas by one of the following means:

* External shutters with provision for ventilation
* Glazing with a maximum g-value of 0.4 and a minimum light transmittance of 0.7
* Overhangs with 50 degrees altitude cut-off on due south-facing façades only

Getting the design, depth, location and style of you external shading device correct is vital. Whilst it is generally accepted that in hot tropical climates, shading is necessary, until recently the near for shading in more temperate climates like the UK has been debated. In the summer of 2022, one of the hottest UK summers on record many buildings in the UK overheated.

This guide produced by UN Habitat group was written in 2018 and focusses on the elimination of the penetration of solar radiation into buildings in tropical climates through glazed surfaces through strategies such as appropriate building orientation (along the east – west axis), adequate sizing of openings (window to wall ratio), proper location of openings (facing north and south), careful selection of glazing properties and appropriate solar protection using sun shading devices. It is an excellent guide to sizing shading devices with learnings that can be applied globally, inculding for the design and sizing of external shades in the UK.

= Related articles on Designing Buildings =

Angular selective shading systems.

Automated blinds.

Blinds.

BREEAM Visual comfort Glare control.

Brise soleil.

Control of solar shading IP 4 17.

Daylight lighting systems.

Exterior shutters.

Glare.

Louvre (or louver).

Retrofitting solar shading.

Solar gain.

Solar shading of buildings BR 364.

Solar thermal panels.

The daylight factor.

Thermal comfort.

Urban heat island effect.

When hospital buildings aren’t healthy.

Wind Resistance for External Blinds.