E-coating - Revision history

Jmdonev: 1 revision imported: Doing upload, largely of old redirects.

2018-06-04T16:52:20Z

1 revision imported: Doing upload, largely of old redirects.

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Jmdonev at 22:57, 31 May 2018

2018-05-31T22:57:15Z

← Older revision		Revision as of 22:57, 31 May 2018
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	[[Category:Done ~~2015~~-04-01]]		[[Category:Done 2018-06-01]]
	[[File:491px-Innerglass-low-e-illustrati.jpg\|400px\|framed\|right\|Figure 1. A diagram illustrating how low-emissivity coatings work to prevent the passage of certain wavelengths of light while still allowing visible light to pass through.<ref>"Innerglass-low-e-illustrati"Licensed under CC BY-SA 4.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Innerglass-low-e-illustrati.jpg#/media/File:Innerglass-low-e-illustrati.jpg</ref> Sunlight comes from the left into the room on the right in both winter and summer. During summer the window prevents heat from entering the house, during the winter the window prevents heat from leaving.]]		[[File:491px-Innerglass-low-e-illustrati.jpg\|400px\|framed\|right\|Figure 1. A diagram illustrating how low-emissivity coatings work to prevent the passage of certain wavelengths of light while still allowing visible light to pass through.<ref>"Innerglass-low-e-illustrati"Licensed under CC BY-SA 4.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Innerglass-low-e-illustrati.jpg#/media/File:Innerglass-low-e-illustrati.jpg</ref> Sunlight comes from the left into the room on the right in both winter and summer. During summer the window prevents heat from entering the house, during the winter the window prevents heat from leaving.]]

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	==How E-coatings Work==		==How E-coatings Work==
	With traditional clear glass windows, significant amounts of [[solar radiation]] pass through the window. This heats objects inside the home, which is undesirable if the [[temperature]] is above what is comfortable. ~~As well~~, warm objects inside of the home can heat the glass of the window up, and the window then re-radiates this [[heat]] into the outside. This leeches warmth from the inside of the home which may not be desired. Ideally, a window is able to prevent heating from the outside in warm months while keeping the temperature inside during the cool months.<ref name="RE2">Windows for High-Performance Commercial Buildings. (March 28, 2015). ''Low-E Coatings'' [Online]. Available: http://www.commercialwindows.org/lowe.php</ref> The ability of the glass or any other material to radiate and re-radiate energy is known as its ''emissivity'', and thus highly reflective materials generally have a low emissivity.<ref name="RE1"/> The ability to lower the emissivity of the glass surfaces in a window improves its insulating properties.		With traditional clear glass windows, significant amounts of [[solar radiation]] pass through the window. This heats objects inside the home, which is undesirable if the [[temperature]] is above what is comfortable. In addition, warm objects inside of the home can heat the glass of the window up, and the window then re-radiates this [[heat]] into the outside. This leeches warmth from the inside of the home which may not be desired. Ideally, a window is able to prevent heating from the outside during warm weather months while keeping the temperature inside during the cool months.<ref name="RE2">Windows for High-Performance Commercial Buildings. (March 28, 2015). ''Low-E Coatings'' [Online]. Available: http://www.commercialwindows.org/lowe.php</ref> The ability of the glass or any other material to radiate and re-radiate energy is known as its ''emissivity'', and thus highly reflective materials generally have a low emissivity.<ref name="RE1"/> The ability to lower the emissivity of the glass surfaces in a window improves its insulating properties.

	Low-e glass has a thin, transparent coating, generally comprised of a thin layer of silver or other low emissivity material, that reflects infrared energy. Simply put it reflects heat (like a heat mirror) and keeps it inside (see figure 1). This prevents heat transfer between the inside and outside environments. Interior heat energy is reflected off the low-e coating, returning the heat back to the inside and reducing radiant heat loss through the window.<ref name="RE1"/> By placing low-e glass into a window, the individual temperatures of the panes change. More heat is retained by the window and the outer pane is heated less by escaping energy, causing the internal pane to become warmer. This then prevents cold drafts from convection near the windows as well as reducing the condensation on the glass. This is how the glass keeps a room warm in the ~~cold~~ months.<ref name="RE4">Pilkington Glass. (March 28, 2015). ''Low-emissivity glass'' [Online]. Available: https://www.pilkington.com/en-gb/uk/householders/types-of-glass/energy-efficient-glass/low-emissivity-glass</ref>		Low-e glass has a thin, transparent coating, generally comprised of a thin layer of silver or other low emissivity material, that reflects infrared energy. Simply put it reflects heat (like a heat mirror) and keeps it inside (see figure 1). This prevents heat transfer between the inside and outside environments. Interior heat energy is reflected off the low-e coating, returning the heat back to the inside and reducing radiant heat loss through the window.<ref name="RE1"/> By placing low-e glass into a window, the individual temperatures of the panes change. More heat is retained by the window and the outer pane is heated less by escaping energy, causing the internal pane to become warmer. This then prevents cold drafts from convection near the windows as well as reducing the condensation on the glass. This is how the glass keeps a room warm during the colder months.<ref name="RE4">Pilkington Glass. (March 28, 2015). ''Low-emissivity glass'' [Online]. Available: https://www.pilkington.com/en-gb/uk/householders/types-of-glass/energy-efficient-glass/low-emissivity-glass</ref>

	[[File:Lowe2.jpg\|400px\|framed\|~~left~~\|Figure 2. A building with low-e windows.<ref>"LawrenceScarpa Cherokee 007780-2" Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:LawrenceScarpa_Cherokee_007780-2.jpg#/media/File:LawrenceScarpa_Cherokee_007780-2.jpg</ref>]]		[[File:Lowe2.jpg\|400px\|framed\|right\|Figure 2. A building with low-e windows.<ref>"LawrenceScarpa Cherokee 007780-2" Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:LawrenceScarpa_Cherokee_007780-2.jpg#/media/File:LawrenceScarpa_Cherokee_007780-2.jpg</ref>]]

	==Manufacturing==		==Manufacturing==
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	Passive low-e coatings are manufactured using a pyrolytic process. In this process the e-coating is applied to the glass while the glass itself is being produced. This causes the coating to fuse to the hot glass, creating a strong bond between the coating and the glass. The glass is then cut into sheets to make windows.<ref name="RE1"/> For these types of coats, it is generally a layer of low-emissivity indium tin oxide that is deposited on the window.<ref name="RE3">Building Green. (March 28, 2015). ''Window Performance - the Magic of Low-E Coatings'' [Online]. Available: https://www2.buildinggreen.com/blogs/window-performance-magic-low-e-coatings</ref>		Passive low-e coatings are manufactured using a pyrolytic process. In this process the e-coating is applied to the glass while the glass itself is being produced. This causes the coating to fuse to the hot glass, creating a strong bond between the coating and the glass. The glass is then cut into sheets to make windows.<ref name="RE1"/> For these types of coats, it is generally a layer of low-emissivity indium tin oxide that is deposited on the window.<ref name="RE3">Building Green. (March 28, 2015). ''Window Performance - the Magic of Low-E Coatings'' [Online]. Available: https://www2.buildinggreen.com/blogs/window-performance-magic-low-e-coatings</ref>

	Passive low-e coatings are generally used in cold climates as they still allow some of the heat energy from the sun to enter the home and help heat the building during the winter. However they still reflect heat energy from the inside that allows heat energy to stay in the home.<ref name="RE1"/> Due to the fact that these glazings let in more solar energy, they have a ~~worse~~ [[R-value]] (or [[U-value]]), but they are better for houses that rely on [[passive solar heating and cooling\|passive solar heating]] because more light and heat can enter the home.<ref name="RE3"/>		Passive low-e coatings are generally used in cold climates as they still allow some of the heat energy from the sun to enter the home and help heat the building during the winter. However they still reflect heat energy from the inside that allows heat energy to stay in the home.<ref name="RE1"/> Due to the fact that these glazings let in more solar energy, they have a do not have a good [[R-value]] (or [[U-value]]), but they are better for houses that rely on [[passive solar heating and cooling\|passive solar heating]] because more light and heat can enter the home.<ref name="RE3"/>

	===Solar Control Low-E Coatings===		===Solar Control Low-E Coatings===
	Solar control low-e coatings are manufactured using a process known as the ''MSVD'' or ''sputtered'' process. In this process, the coating is applied to pre-cut glass in a vacuum chamber. The coating is not as firmly attached as those applied in a pyrolytic process so a seal and/or laminate must be applied to keep the bond strong. This type of coating has a lower emissivity and thus lets less solar energy through the window. For these types of coats, it is generally a thin layer of silver that is deposited on the window.<ref name="RE3"/>		Solar control low-e coatings are manufactured using a process known as the ''MSVD'' or ''sputtered'' process. In this process, the coating is applied to pre-cut glass in a vacuum chamber. The coating is not as firmly attached as those applied in a pyrolytic process, so a seal and/or laminate must be applied to keep the bond strong. This type of coating has a lower emissivity and thus lets less solar energy through the window. For these types of coats, it is generally a thin layer of silver that is deposited on the window.<ref name="RE3"/>

	Solar control low-e coatings are generally used in hotter climates where keeping external heat from entering a building is more important.<ref name="RE1"/>		Solar control low-e coatings are generally used in hotter climates where keeping external heat from entering a building is more important.<ref name="RE1"/>

			==For Further Reading==
			*[[Window]]
			*[[Insulation]]
			*[[R-value]]
			*[[U-value]]
			*Or explore a [[Special:Random\| random page]]

	==References==		==References==
	{{reflist}}		{{reflist}}
	[[Category:Uploaded]]		[[Category:Uploaded]]

J.williams: 1 revision imported

2015-08-26T21:31:00Z

1 revision imported

← Older revision	Revision as of 21:31, 26 August 2015
(No difference)

J.williams at 16:53, 12 August 2015

2015-08-12T16:53:07Z

New page

[[Category:Done 2015-04-01]]
[[File:491px-Innerglass-low-e-illustrati.jpg|400px|framed|right|Figure 1. A diagram illustrating how low-emissivity coatings work to prevent the passage of certain wavelengths of light while still allowing visible light to pass through.<ref>"Innerglass-low-e-illustrati"Licensed under CC BY-SA 4.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:Innerglass-low-e-illustrati.jpg#/media/File:Innerglass-low-e-illustrati.jpg</ref> Sunlight comes from the left into the room on the right in both winter and summer. During summer the window prevents heat from entering the house, during the winter the window prevents heat from leaving.]]

<onlyinclude>'''E-coatings''' or '''Low-emissivity coatings''' are thin coatings that are put on top of traditional glass [[window]]s that prevent or limit certain [[wavelength]]s of [[light]] from passing through the pane while still allowing the passage of visible light.</onlyinclude><ref name="RE1">PPG Glass Education Center. (March 28, 2015). ''What is Low-E Glass'' [Online]. Available: http://educationcenter.ppg.com/glasstopics/how_lowe_works.aspx</ref> These coatings reflect ultraviolet or infrared light to increase the [[insulation|insulating]] performance of the glass leading to increased [[energy efficient building design|energy efficiency]] while still maintaining the appeal of a clear window.

It is desirable to limit the entrance of ultraviolet light <ref> This is light with wavelengths between 310-380 nanometers</ref> into the home as they cause interior materials such as fabrics and wall coverings to fade. Infrared light<ref>This is light with a wavelength around 780 nanometers</ref> transmits [[heat]] into the home. Infrared from the sun is known as ''short-wave infrared'', whereas infrared from other warm objects is known as ''long-wave infrared''.<ref name="RE1"/> Preventing the passage of this type of light also prevents the movement of heat from where it is needed, see figure 1.

==How E-coatings Work==
With traditional clear glass windows, significant amounts of [[solar radiation]] pass through the window. This heats objects inside the home, which is undesirable if the [[temperature]] is above what is comfortable. As well, warm objects inside of the home can heat the glass of the window up, and the window then re-radiates this [[heat]] into the outside. This leeches warmth from the inside of the home which may not be desired. Ideally, a window is able to prevent heating from the outside in warm months while keeping the temperature inside during the cool months.<ref name="RE2">Windows for High-Performance Commercial Buildings. (March 28, 2015). ''Low-E Coatings'' [Online]. Available: http://www.commercialwindows.org/lowe.php</ref> The ability of the glass or any other material to radiate and re-radiate energy is known as its ''emissivity'', and thus highly reflective materials generally have a low emissivity.<ref name="RE1"/> The ability to lower the emissivity of the glass surfaces in a window improves its insulating properties.

Low-e glass has a thin, transparent coating, generally comprised of a thin layer of silver or other low emissivity material, that reflects infrared energy. Simply put it reflects heat (like a heat mirror) and keeps it inside (see figure 1). This prevents heat transfer between the inside and outside environments. Interior heat energy is reflected off the low-e coating, returning the heat back to the inside and reducing radiant heat loss through the window.<ref name="RE1"/> By placing low-e glass into a window, the individual temperatures of the panes change. More heat is retained by the window and the outer pane is heated less by escaping energy, causing the internal pane to become warmer. This then prevents cold drafts from convection near the windows as well as reducing the condensation on the glass. This is how the glass keeps a room warm in the cold months.<ref name="RE4">Pilkington Glass. (March 28, 2015). ''Low-emissivity glass'' [Online]. Available: https://www.pilkington.com/en-gb/uk/householders/types-of-glass/energy-efficient-glass/low-emissivity-glass</ref>

[[File:Lowe2.jpg|400px|framed|left|Figure 2. A building with low-e windows.<ref>"LawrenceScarpa Cherokee 007780-2" Licensed under CC BY-SA 3.0 via Wikimedia Commons - http://commons.wikimedia.org/wiki/File:LawrenceScarpa_Cherokee_007780-2.jpg#/media/File:LawrenceScarpa_Cherokee_007780-2.jpg</ref>]]

==Manufacturing==
Low-e coatings come in two types, ''passive low-e coatings'' and ''solar low-e coatings''. These are manufactured in two different ways.<ref name="RE1"/> There are several different portions of a window that these coatings can be applied to. These correspond to four "faces" of the panes in a double glazed window. For each panel of glass, the low-e coating can be applied to the inner or outer facing side of the pane.

===Passive Low-E Coatings===
Passive low-e coatings are manufactured using a pyrolytic process. In this process the e-coating is applied to the glass while the glass itself is being produced. This causes the coating to fuse to the hot glass, creating a strong bond between the coating and the glass. The glass is then cut into sheets to make windows.<ref name="RE1"/> For these types of coats, it is generally a layer of low-emissivity indium tin oxide that is deposited on the window.<ref name="RE3">Building Green. (March 28, 2015). ''Window Performance - the Magic of Low-E Coatings'' [Online]. Available: https://www2.buildinggreen.com/blogs/window-performance-magic-low-e-coatings</ref>

Passive low-e coatings are generally used in cold climates as they still allow some of the heat energy from the sun to enter the home and help heat the building during the winter. However they still reflect heat energy from the inside that allows heat energy to stay in the home.<ref name="RE1"/> Due to the fact that these glazings let in more solar energy, they have a worse [[R-value]] (or [[U-value]]), but they are better for houses that rely on [[passive solar heating and cooling|passive solar heating]] because more light and heat can enter the home.<ref name="RE3"/>

===Solar Control Low-E Coatings===
Solar control low-e coatings are manufactured using a process known as the ''MSVD'' or ''sputtered'' process. In this process, the coating is applied to pre-cut glass in a vacuum chamber. The coating is not as firmly attached as those applied in a pyrolytic process so a seal and/or laminate must be applied to keep the bond strong. This type of coating has a lower emissivity and thus lets less solar energy through the window. For these types of coats, it is generally a thin layer of silver that is deposited on the window.<ref name="RE3"/>

Solar control low-e coatings are generally used in hotter climates where keeping external heat from entering a building is more important.<ref name="RE1"/>

==References==
{{reflist}}
[[Category:Uploaded]]