Spectrally-Selective-Windows - Revision history

Simcha at 21:31, 18 March 2013

2013-03-18T21:31:20Z

← Older revision		Revision as of 21:31, 18 March 2013
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	{{Energy Efficient Windows‎}}		{{Energy Efficient Windows‎}}
		+
		+	[[Category:Replacement Windows]]

Simcha at 21:30, 18 March 2013

2013-03-18T21:30:14Z

← Older revision		Revision as of 21:30, 18 March 2013
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	=== Cost Savings ===		=== Cost Savings ===
	A spectrally selective window should, when used in combination with windows that offer sufficient [[Window U Factor\|U-Factor]] values, allow the homeowner to realize a return on the investment within four to seven years in reduced energy bills.		A spectrally selective window should, when used in combination with windows that offer sufficient [[Window U Factor\|U-Factor]] values, allow the homeowner to realize a return on the investment within four to seven years in reduced energy bills.
		+
		+	{{Energy Efficient Windows‎}}

Simcha at 19:39, 20 January 2013

2013-01-20T19:39:23Z

← Older revision		Revision as of 19:39, 20 January 2013
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	\|data6 = Spectrally Selective Glazing, Spectrally Selective Glass		\|data6 = Spectrally Selective Glazing, Spectrally Selective Glass
	\|header7 = Description:		\|header7 = Description:
−	\|data8 = A window glazing that permits some portions of the solar spectrum to enter a home while blocking others.}}	+	\|data8 = A window glazing that permits some portions of the solar spectrum to enter a home while blocking others, used to reduce energy costs.}}

−	'''Spectrally selective glazing''' is a tinted or coated window glazing that has optical or solar properties which vary across the solar spectrum. These glazings typically offer a low transmission of solar gains in conjunction with a high transmission of visible light.	+	'''Spectrally selective glazing''' is a tinted or coated window glazing that has optical or solar properties which vary across the solar spectrum. These glazings typically offer a low transmission of solar gains in conjunction with a high transmission of visible light, blocking unnecessary radiation and reducing energy costs.

	== Spectrally Selective Windows ==		== Spectrally Selective Windows ==
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	=== Glass Tints ===		=== Glass Tints ===
−	Spectrally selective glazings often feature a slight green or blue appearance. The tint is slight, however, because the visible light is transmitted relatively evenly over the visible spectrum. These tints don't affect the U-Value or thermal insulating value of the window. The most energy efficient spectrally selective replacement windows~~, however~~, are ~~so slightly~~ tinted ~~as to be~~ unnoticeable.	+	Spectrally selective glazings often feature a slight green or blue appearance. The tint is slight, however, because the visible light is transmitted relatively evenly over the visible spectrum. These tints don't affect the U-Value or thermal insulating value of the window. The most energy efficient spectrally selective replacement windows, are tinted so it is almost unnoticeable.

	=== Tempered Glass ===		=== Tempered Glass ===

Simcha at 19:35, 20 January 2013

2013-01-20T19:35:14Z

← Older revision		Revision as of 19:35, 20 January 2013
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	== Spectrally Selective Windows ==		== Spectrally Selective Windows ==
−	There are a wide range of spectrally selective window options but the newest generation of spectrally selective glazings exaggerate the differences between the visible and infra-red portions of the spectrum, two of the three components of solar radiation (visible radiation -- sunlight --, infrared radiation and ultra-violet radiation). In this way the spectrally selective windows ensure that infra-red radiation is blocked.	+	There are a wide range of spectrally selective window options but the newest generation of spectrally selective glazings exaggerate the differences between the visible and infra-red portions of the spectrum, two of the three components of solar radiation (visible radiation -- sunlight --, infrared radiation and ultra-violet radiation). In this way the spectrally selective windows ensure that infra-red radiation is blocked.
		+
	== Description ==		== Description ==
	Approximately 50% of the sun's energy transmits heat but does not transmit light. This occurs because the infrared and ultra-violet portions of the sun's light occur outside of the visible portion of the spectrum. Spectrally-selective glazings transfer a high percentage of the sunlight but screen up to 80% of the infra-red radiation. A low percentage of radiant heat transmits from the sun and reduces the need to cool building interiors.		Approximately 50% of the sun's energy transmits heat but does not transmit light. This occurs because the infrared and ultra-violet portions of the sun's light occur outside of the visible portion of the spectrum. Spectrally-selective glazings transfer a high percentage of the sunlight but screen up to 80% of the infra-red radiation. A low percentage of radiant heat transmits from the sun and reduces the need to cool building interiors.
Line 16:		Line 17:
	== Tints, Glass Types and Coatings ==		== Tints, Glass Types and Coatings ==
	Spectrally selective glass may include different tints and types of glass.		Spectrally selective glass may include different tints and types of glass.
		+
	=== Glass Tints ===		=== Glass Tints ===
−	Spectrally selective glazings often feature a slight green or blue appearance. The tint is slight, however, because the visible light is transmitted relatively evenly over the visible spectrum. These tints don't affect the U-Value or thermal insulating value of the window. The most energy efficient spectrally selective replacement windows, however, are so slightly tinted as to be unnoticeable.	+	Spectrally selective glazings often feature a slight green or blue appearance. The tint is slight, however, because the visible light is transmitted relatively evenly over the visible spectrum. These tints don't affect the U-Value or thermal insulating value of the window. The most energy efficient spectrally selective replacement windows, however, are so slightly tinted as to be unnoticeable.
		+
	=== Tempered Glass ===		=== Tempered Glass ===
−	Large window units which have spectrally selective glass panels are often manufactured using tempered glass to strengthen the glazing unit.	+	Large window units which have spectrally selective glass panels are often manufactured using tempered glass to strengthen the glazing unit.
		+
	=== Low E Coating ===		=== Low E Coating ===
	Low-emissivity (Low-E) coatings can be added to the spectrally- selective glazing to improve thermal performance.		Low-emissivity (Low-E) coatings can be added to the spectrally- selective glazing to improve thermal performance.
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	===Aesthetics ===		===Aesthetics ===
−	A clear spectrally selective replacement window should provide a clear view of the outdoors.	+	A clear spectrally selective replacement window should provide a clear view of the outdoors.
		+
	=== Cost Savings ===		=== Cost Savings ===
	A spectrally selective window should, when used in combination with windows that offer sufficient [[Window U Factor\|U-Factor]] values, allow the homeowner to realize a return on the investment within four to seven years in reduced energy bills.		A spectrally selective window should, when used in combination with windows that offer sufficient [[Window U Factor\|U-Factor]] values, allow the homeowner to realize a return on the investment within four to seven years in reduced energy bills.

Simcha at 19:34, 20 January 2013

2013-01-20T19:34:20Z

← Older revision		Revision as of 19:34, 20 January 2013
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−	{{Infobox	+	{{Infobox
	\|title Spectrally Selective Windows		\|title Spectrally Selective Windows
	\|image = [[File:Space holder.jpg\|215px\|alt=Block Glass Windows]]		\|image = [[File:Space holder.jpg\|215px\|alt=Block Glass Windows]]
−	\|header5 = ~~Spectrally Selective Windows~~	+	\|header5 = Other Names:
−	\|data6 = Spectrally Selective Glazing	+	\|data6 = Spectrally Selective Glazing, Spectrally Selective Glass
	\|header7 = Description:		\|header7 = Description:
−	\|data8 = ~~Spectrally selective glass involves a~~ window glazing that permits some portions of the solar spectrum to enter a home while ~~it blocks~~ others}}	+	\|data8 = A window glazing that permits some portions of the solar spectrum to enter a home while blocking others.}}

−	Spectrally selective glazing is a tinted or coated window glazing that has optical or solar properties which vary across the solar spectrum. These glazings typically offer a low transmission of solar gains in conjunction with a high transmission of visible light.	+	'''Spectrally selective glazing''' is a tinted or coated window glazing that has optical or solar properties which vary across the solar spectrum. These glazings typically offer a low transmission of solar gains in conjunction with a high transmission of visible light.

	== Spectrally Selective Windows ==		== Spectrally Selective Windows ==

Laurierappeport: /* Ratings = */

2012-09-19T08:39:18Z

Ratings =

← Older revision		Revision as of 08:39, 19 September 2012
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	Low-emissivity (Low-E) coatings can be added to the spectrally- selective glazing to improve thermal performance.		Low-emissivity (Low-E) coatings can be added to the spectrally- selective glazing to improve thermal performance.

−	== Ratings ===	+	== Ratings ==
−	The effectiveness of spectrally selective glazings are measured by light-to-solar ratio (LSR). This is the ratio of [[Visible Transmittance\|visible light transmission]] divided by the [[Solar Heat Gain Coefficient\|solar heat gain coefficient]] for the glazing system. Clear un-spectrally-selective glazing units will have a value of close to 1.0 while a quality spectrally-selective glazing system will have a value of greater than 1.7. The highest possible light-to-solar ratio is approximately 2.0.	+	The effectiveness of spectrally selective glazings are measured by light-to-solar ratio (LSR). This is the ratio of [[Visible Transmittance\|visible light transmission]] divided by the [[Solar Heat Gain Coefficient\|solar heat gain coefficient]] for the glazing system. Clear un-spectrally-selective glazing units will have a value of close to 1.0 while a quality spectrally-selective glazing system will have a value of greater than 1.7. The highest possible light-to-solar ratio is approximately 2.0.
		+
	== Considerations ==		== Considerations ==
	Homeowners should review the benefits offered by spectrally selective replacement windows before making a purchase. These include the amount of visible light that the window transmits. The best spectrally selective energy efficient replacement windows transmit at least 70% of visible light, ensuring that the home benefits from proper daylighting while the windows block unwanted infrared radiation.		Homeowners should review the benefits offered by spectrally selective replacement windows before making a purchase. These include the amount of visible light that the window transmits. The best spectrally selective energy efficient replacement windows transmit at least 70% of visible light, ensuring that the home benefits from proper daylighting while the windows block unwanted infrared radiation.

Laurierappeport: Created page with " {{Infobox |title Spectrally Selective Windows |image = alt=Block Glass Windows |header5 = Spectrally Selective Windows |data6 = Spectral..."

2012-09-19T08:38:58Z

Created page with " {{Infobox |title Spectrally Selective Windows |image = alt=Block Glass Windows |header5 = Spectrally Selective Windows |data6 = Spectral..."

New page

{{Infobox
|title Spectrally Selective Windows
|image = [[File:Space holder.jpg|215px|alt=Block Glass Windows]]
|header5 = Spectrally Selective Windows
|data6 = Spectrally Selective Glazing
|header7 = Description:
|data8 = Spectrally selective glass involves a window glazing that permits some portions of the solar spectrum to enter a home while it blocks others}}

Spectrally selective glazing is a tinted or coated window glazing that has optical or solar properties which vary across the solar spectrum. These glazings typically offer a low transmission of solar gains in conjunction with a high transmission of visible light.

== Spectrally Selective Windows ==
There are a wide range of spectrally selective window options but the newest generation of spectrally selective glazings exaggerate the differences between the visible and infra-red portions of the spectrum, two of the three components of solar radiation (visible radiation -- sunlight --, infrared radiation and ultra-violet radiation). In this way the spectrally selective windows ensure that infra-red radiation is blocked.
== Description ==
Approximately 50% of the sun's energy transmits heat but does not transmit light. This occurs because the infrared and ultra-violet portions of the sun's light occur outside of the visible portion of the spectrum. Spectrally-selective glazings transfer a high percentage of the sunlight but screen up to 80% of the infra-red radiation. A low percentage of radiant heat transmits from the sun and reduces the need to cool building interiors.

== Tints, Glass Types and Coatings ==
Spectrally selective glass may include different tints and types of glass.
=== Glass Tints ===
Spectrally selective glazings often feature a slight green or blue appearance. The tint is slight, however, because the visible light is transmitted relatively evenly over the visible spectrum. These tints don't affect the U-Value or thermal insulating value of the window. The most energy efficient spectrally selective replacement windows, however, are so slightly tinted as to be unnoticeable.
=== Tempered Glass ===
Large window units which have spectrally selective glass panels are often manufactured using tempered glass to strengthen the glazing unit.
=== Low E Coating ===
Low-emissivity (Low-E) coatings can be added to the spectrally- selective glazing to improve thermal performance.

== Ratings ===
The effectiveness of spectrally selective glazings are measured by light-to-solar ratio (LSR). This is the ratio of [[Visible Transmittance|visible light transmission]] divided by the [[Solar Heat Gain Coefficient|solar heat gain coefficient]] for the glazing system. Clear un-spectrally-selective glazing units will have a value of close to 1.0 while a quality spectrally-selective glazing system will have a value of greater than 1.7. The highest possible light-to-solar ratio is approximately 2.0.
== Considerations ==
Homeowners should review the benefits offered by spectrally selective replacement windows before making a purchase. These include the amount of visible light that the window transmits. The best spectrally selective energy efficient replacement windows transmit at least 70% of visible light, ensuring that the home benefits from proper daylighting while the windows block unwanted infrared radiation.

== Selection ==
When choosing a spectrally selective replacement window homeowners should review the window's clarity, heat blocking rating, aesthetics and cost savings.

=== Clarity ===
A high quality spectrally selective replacement window should be clear yet able to block significant amounts of unwanted solar heat and reduce glare.

=== Heat Blocking Ratings ===
Spectrally selective windows that block acceptable amounts of heat and sunlight transmissions should display a Solar Heat Gain Coefficient of 0.51 or less and a Visible Light rating of 15% or less.

===Aesthetics ===
A clear spectrally selective replacement window should provide a clear view of the outdoors.
=== Cost Savings ===
A spectrally selective window should, when used in combination with windows that offer sufficient [[Window U Factor|U-Factor]] values, allow the homeowner to realize a return on the investment within four to seven years in reduced energy bills.