Designing Buildings - User contributions [en]

Angular selective shading systems

2022-01-06T13:53:16Z

Koolshademaker:

[[File:SunshineWindows.jpg|link=File:SunshineWindows.jpg]]

= Introduction =

[[Angular_selective|Angular selective]] shading systems are generally static, energy efficient window treatments that are suitable for new construction or retrofit projects. They block or filter direct sunlight while allowing diffuse daylight to pass through windows within a specific range. Static, angular selective shading systems offer a potentially low-cost option to reduce window heat gains and control glare while permitting the admission of useful daylight and access to views.

These passive systems are optically complex, designed to have characteristics that allow them to selectively assume different properties related to the transmission of light.

= Types of angular selective systems =

There are generally single and double layer systems. The single layer systems tend to manage visual glare through angular selective control but have moderately high transmittance in the near infrared and a high emittance. Two layer systems tend to offer low emittance and better solar control, but still offer good visible angular selectivity.

They can be made from a wide variety of materials and produced in a broad array of shapes, sizes and colours that can be installed at angles that preserve views (both in and out of windows), reduce solar heat gain and controlling glare and excessive light.

== External ==

Examples include woven metal screens or punched metal scrims for building exteriors. In certain instances, these products can be mechanically manoeuvred (either manually or electronically) into the ideal position based on conditions and preferences.

== Between pane ==

There are also between-pane options, including [https://www.smartlouvre.com/products/microlouvre-screens micro-louvred systems] (in metal, fabric or mirrored materials) or highly reflective sculpted mesh. These systems tend to have wider application possibilities and may last longer than their exterior counterparts, with lower maintenance requirements, but they may not offer the same flexibility in terms of deployment.

They must also be designed in a manner that does not interfere with - or possibly damage - low-e window coatings. Low-e glass is a type of glass that has a coating added to one or more of its surfaces to reduce its emissivity so that it rejects a higher proportion of long-wave infra-red radiation.

== Glass treatments ==

Angular selective fritted or etched glass is another method of reducing window heat gain while preserving the transmission of natural daylight.

There are also certain types of oblique thin metal and metal insulator coatings that can be spectrally selective. As a type of smart window system, these coatings are configured as a grating made from parallel strips of material. The strips serve to manage solar radiation through angular selective light transmission based on predefined preferences.

= Related articles on Designing Buildings Wiki =

* Emissivity.
* Fritting.
* Glazing.
* Low-e glass.
* Solar shading.
* Types of window.
* When hospital buildings are not healthy.

[[Category:DCN_Product_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Sustainability]] [[Category:Products_/_components]]

Angular selective shading systems

2022-01-06T13:49:41Z

Koolshademaker:

[[File:SunshineWindows.jpg|link=File:SunshineWindows.jpg]]

= Introduction =

[[Angular_selective|Angular selective]] shading systems are generally static, energy efficient window treatments that are suitable for new construction or retrofit projects. They block or filter direct sunlight while allowing diffuse daylight to pass through windows within a specific range. Static, angular selective shading systems offer a potentially low-cost option to reduce window heat gains and control glare while permitting the admission of useful daylight and access to views.

These passive systems are optically complex, designed to have characteristics that allow them to selectively assume different properties related to the transmission of light.

= Types of angular selective systems =

There are generally single and double layer systems. The single layer systems tend to manage visual glare through angular selective control but have moderately high transmittance in the near infrared and a high emittance. Two layer systems tend to offer low emittance and better solar control, but still offer good visible angular selectivity.

They can be made from a wide variety of materials and produced in a broad array of shapes, sizes and colours that can be installed at angles that preserve views (both in and out of windows), reduce solar heat gain and controlling glare and excessive light.

== External ==

Examples include woven metal screens or punched metal scrims for building exteriors. In certain instances, these products can be mechanically manoeuvred (either manually or electronically) into the ideal position based on conditions and preferences.

== Between pane ==

There are also between-pane options, including mini-louvre systems (in metal, fabric or mirrored materials) or highly reflective sculpted mesh. These systems tend to have wider application possibilities and may last longer than their exterior counterparts, with lower maintenance requirements, but they may not offer the same flexibility in terms of deployment.

They must also be designed in a manner that does not interfere with - or possibly damage - low-e window coatings. Low-e glass is a type of glass that has a coating added to one or more of its surfaces to reduce its emissivity so that it rejects a higher proportion of long-wave infra-red radiation.

== Glass treatments ==

Angular selective fritted or etched glass is another method of reducing window heat gain while preserving the transmission of natural daylight.

There are also certain types of oblique thin metal and metal insulator coatings that can be spectrally selective. As a type of smart window system, these coatings are configured as a grating made from parallel strips of material. The strips serve to manage solar radiation through angular selective light transmission based on predefined preferences.

= Related articles on Designing Buildings Wiki =

* Emissivity.
* Fritting.
* Glazing.
* Low-e glass.
* Solar shading.
* Types of window.
* When hospital buildings are not healthy.

[[Category:DCN_Product_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Sustainability]] [[Category:Products_/_components]]

Angular selective

2022-01-06T13:42:32Z

Koolshademaker: Created page with "= Definition = Angular Selectivity is a special case of angular dependence. Angle dependant performance simply means that the relevant property, for example, the transmittance t..."

= Definition =

Angular Selectivity is a special case of angular dependence. Angle dependant performance simply means that the relevant property, for example, the transmittance through or reflectance from the illuminated surface takes on different numerical values for different angles of incidence. The angle of incidence, which is often designated "theta” is the angle subtended between the normal or perpendicular plane to a given surface and a ray of incoming (incident) light. A common example is that any ordinary pane of clear glass will have its highest transmittance value (and lowest reflectance value) for theta = 0° and its lowest transmittance value (namely zero) and highest reflectance value for theta = 90°.

To define Angular Selectivity, we need to introduce a second angle, namely an azimuthal angle or "phi", which describes rotation around the surface normal in a plane parallel to the surface. It is only of interest if the surface is not homogeneous but has some structure which varies according to the azimuthal angle. Taking a vertically mounted projection and defining the upward direction by phi = 0°, we have angle selective behaviour, because the transmittance for a given fixed theta value is different for different phi values. Using a lamella or louvre array as an example, when theta = 40 ° and phi = 0°, the transmittance is quite low, whereas for theta = 10° and phi = 180°, the transmittance is higher. If different amounts of light are transmitted, for the same angle of incidence theta, depending on whether the light comes from above or below then the sample is angle selective. By contrast, a homogeneous material like a pane of clear is not angle selective; it always has the same transmittance value for a given theta, independent of the value of phi.

[[Category:Definitions]] [[Category:Education]]

Angular selective shading systems

2022-01-06T13:39:43Z

Koolshademaker:

Angular selective shading systems

2022-01-06T13:38:27Z

Koolshademaker:

[[File:SunshineWindows.jpg|link=File:SunshineWindows.jpg]]

= Introduction =

Angular selective shading systems are generally static, energy efficient window treatments that are suitable for new construction or retrofit projects. They block or filter direct sunlight while allowing diffuse daylight to pass through windows within a specific range. Static, angular selective shading systems offer a potentially low-cost option to reduce window heat gains and control glare while permitting the admission of useful daylight and access to views.

These passive systems are optically complex, designed to have characteristics that allow them to selectively assume different properties related to the transmission of light.

= Definition =

Angular Selectivity is a special case of angular dependence. Angle dependant performance simply means that the relevant property, for example, the transmittance through or reflectance from the illuminated surface takes on different numerical values for different angles of incidence. The angle of incidence, which is often designated "theta” is the angle subtended between the normal or perpendicular plane to a given surface and a ray of incoming (incident) light. A common example is that any ordinary pane of clear glass will have its highest transmittance value (and lowest reflectance value) for theta = 0° and its lowest transmittance value (namely zero) and highest reflectance value for theta = 90°.

To define Angular Selectivity, we need to introduce a second angle, namely an azimuthal angle or "phi", which describes rotation around the surface normal in a plane parallel to the surface. It is only of interest if the surface is not homogeneous but has some structure which varies according to the azimuthal angle. Taking a vertically mounted projection and defining the upward direction by phi = 0°, we have angle selective behaviour, because the transmittance for a given fixed theta value is different for different phi values. Using a lamella or louvre array as an example, when theta = 40 ° and phi = 0°, the transmittance is quite low, whereas for theta = 10° and phi = 180°, the transmittance is higher. If different amounts of light are transmitted, for the same angle of incidence theta, depending on whether the light comes from above or below then the sample is angle selective. By contrast, a homogeneous material like a pane of clear is not angle selective; it always has the same transmittance value for a given theta, independent of the value of phi.

= Types of angular selective systems =

There are generally single and double layer systems. The single layer systems tend to manage visual glare through angular selective control but have moderately high transmittance in the near infrared and a high emittance. Two layer systems tend to offer low emittance and better solar control, but still offer good visible angular selectivity.

They can be made from a wide variety of materials and produced in a broad array of shapes, sizes and colours that can be installed at angles that preserve views (both in and out of windows), reduce solar heat gain and controlling glare and excessive light.

== External ==

Examples include woven metal screens or punched metal scrims for building exteriors. In certain instances, these products can be mechanically manoeuvred (either manually or electronically) into the ideal position based on conditions and preferences.

== Between pane ==

There are also between-pane options, including mini-louvre systems (in metal, fabric or mirrored materials) or highly reflective sculpted mesh. These systems tend to have wider application possibilities and may last longer than their exterior counterparts, with lower maintenance requirements, but they may not offer the same flexibility in terms of deployment.

They must also be designed in a manner that does not interfere with - or possibly damage - low-e window coatings. Low-e glass is a type of glass that has a coating added to one or more of its surfaces to reduce its emissivity so that it rejects a higher proportion of long-wave infra-red radiation.

== Glass treatments ==

Angular selective fritted or etched glass is another method of reducing window heat gain while preserving the transmission of natural daylight.

There are also certain types of oblique thin metal and metal insulator coatings that can be spectrally selective. As a type of smart window system, these coatings are configured as a grating made from parallel strips of material. The strips serve to manage solar radiation through angular selective light transmission based on predefined preferences.

= Related articles on Designing Buildings Wiki =

* Emissivity.
* Fritting.
* Glazing.
* Low-e glass.
* Solar shading.
* Types of window.
* When hospital buildings are not healthy.

[[Category:DCN_Product_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Sustainability]] [[Category:Products_/_components]]

Angular selective shading systems

2022-01-06T13:20:54Z

Koolshademaker:

[[File:SunshineWindows.jpg|link=File:SunshineWindows.jpg]]

= Introduction =

Angular selective shading systems are generally static, energy efficient window treatments that are suitable for new construction or retrofit projects. They block or filter direct sunlight while allowing diffuse daylight to pass through windows within a specific range. Static, angular selective shading systems offer a potentially low-cost option to reduce window heat gains and control glare while permitting the admission of useful daylight and access to views.

These passive systems are optically complex, designed to have characteristics that allow them to selectively assume different properties related to the transmission of light.

= Definition =

Angular selectivity is a special case of angular dependence. Angle dependant performance simply means that the relevant property, for example, the transmittance through or reflectance from the illuminated surface takes on different numerical values for different angles of incidence. The angle of incidence, which is often designated "theta” is the angle subtended between the normal or perpendicular plane to a given surface and a ray of incoming (incident) light. A common example is that any ordinary pane of clear glass will have its highest transmittance value (and lowest reflectance value) for theta = 0° and its lowest transmittance value (namely zero) and highest reflectance value for theta = 90°.

To define Angular Selective performance, we need to introduce a second angle, namely an azimuthal angle "phi", which describes rotation around the surface normal in a plane parallel to the surface. It is only of interest if the surface is not homogeneous but has some structure which varies according to the azimuthal angle. Taking a vertically mounted projection and defining the upward direction by phi = 0°, we have angle selective behaviour, because the transmittance for a given fixed theta value is different for different phi values. Using a lamella or louvre array as an example, when theta = 40 ° and phi = 0°, the transmittance is quite low, whereas for theta = 10° and phi = 180°, the transmittance is higher. If different amounts of light are transmitted, for the same angle of incidence theta, depending on whether the light comes from above or below then the sample is angle selective. By contrast, a homogeneous material like a pane of clear is not angle selective; it always has the same transmittance value for a given theta, independent of the value of phi.

= Types of angular selective systems =

There are generally single and double layer systems. The single layer systems tend to manage visual glare through angular selective control but have moderately high transmittance in the near infrared and a high emittance. Two layer systems tend to offer low emittance and better solar control, but still offer good visible angular selectivity.

They can be made from a wide variety of materials and produced in a broad array of shapes, sizes and colours that can be installed at angles that preserve views (both in and out of windows), reduce solar heat gain and controlling glare and excessive light.

== External ==

Examples include woven metal screens or punched metal scrims for building exteriors. In certain instances, these products can be mechanically manoeuvred (either manually or electronically) into the ideal position based on conditions and preferences.

== Between pane ==

There are also between-pane options, including mini-louvre systems (in metal, fabric or mirrored materials) or highly reflective sculpted mesh. These systems tend to have wider application possibilities and may last longer than their exterior counterparts, with lower maintenance requirements, but they may not offer the same flexibility in terms of deployment.

They must also be designed in a manner that does not interfere with - or possibly damage - low-e window coatings. Low-e glass is a type of glass that has a coating added to one or more of its surfaces to reduce its emissivity so that it rejects a higher proportion of long-wave infra-red radiation.

== Glass treatments ==

Angular selective fritted or etched glass is another method of reducing window heat gain while preserving the transmission of natural daylight.

There are also certain types of oblique thin metal and metal insulator coatings that can be spectrally selective. As a type of smart window system, these coatings are configured as a grating made from parallel strips of material. The strips serve to manage solar radiation through angular selective light transmission based on predefined preferences.

= Related articles on Designing Buildings Wiki =

* Emissivity.
* Fritting.
* Glazing.
* Low-e glass.
* Solar shading.
* Types of window.
* When hospital buildings are not healthy.

[[Category:DCN_Product_Knowledge]] [[Category:DCN_Research,_Development_and_Innovation]] [[Category:Sustainability]] [[Category:Products_/_components]]