Thermal insulation - Revision history

Jmdonev: 1 revision imported

2021-09-27T00:03:12Z

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energy>Ethan.boechler at 21:06, 10 September 2021

2021-09-10T21:06:19Z

← Older revision		Revision as of 21:06, 10 September 2021
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	[[Category:Done 2020-01-31]]		[[Category:Done 2020-01-31]]
			[[Category:Translated to French]]
			[[fr:Isolation thermique]]
	[[File:Aerogel.jpg\|framed\|right\|Figure 1. Aerogel is an extremely good thermal insulator, capable of keeping the matches from igniting despite the blowtorch's flame. <ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref> Bubbles of air prevent [[thermal conduction]].]]		[[File:Aerogel.jpg\|framed\|right\|Figure 1. Aerogel is an extremely good thermal insulator, capable of keeping the matches from igniting despite the blowtorch's flame. <ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref> Bubbles of air prevent [[thermal conduction]].]]
	<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].		<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].

Jmdonev: 1 revision imported

2020-01-31T05:10:00Z

1 revision imported

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Energy>Jmdonev at 20:02, 19 January 2020

2020-01-19T20:02:44Z

← Older revision		Revision as of 20:02, 19 January 2020
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	[[Category:Done ~~2018~~-06-15]]		[[Category:Done 2020-01-31]]
	[[File:Aerogel.jpg\|framed\|right\|Figure 1. ~~The photo above shows~~ Aerogel, an extremely good thermal insulator, ~~between a blowtorch and matches. The insulating properties~~ of ~~the Aerogel prevent~~ the matches from ~~burning~~.<ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref>]]		[[File:Aerogel.jpg\|framed\|right\|Figure 1. Aerogel is an extremely good thermal insulator, capable of keeping the matches from igniting despite the blowtorch's flame. <ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref> Bubbles of air prevent [[thermal conduction]].]]
	<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].		<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].

Jmdonev: 1 revision imported

2018-06-25T14:30:26Z

1 revision imported

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Jmdonev at 20:56, 8 June 2018

2018-06-08T20:56:54Z

← Older revision		Revision as of 20:56, 8 June 2018
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	[[Category:Done 2018-05-18]]		[[Category:Done 2018-06-15]]
	[[File:Aerogel.jpg\|framed\|right\|Figure 1. The photo above shows Aerogel, an extremely good thermal insulator, between a blowtorch and matches. The insulating properties of the Aerogel prevent the matches from burning.<ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref>]]		[[File:Aerogel.jpg\|framed\|right\|Figure 1. The photo above shows Aerogel, an extremely good thermal insulator, between a blowtorch and matches. The insulating properties of the Aerogel prevent the matches from burning.<ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref>]]
	<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].		<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].
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	\|}		\|}
	</center>		</center>
			==For Further Reading==
			*[[Fibrous insulation]]
			*[[Home heating]]
			*[[Home temperature control]]
			*[[R-value]]
			*Or explore a [[Special:Random\|random page]]

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

Jmdonev: 1 revision imported

2018-05-18T22:53:15Z

1 revision imported

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Jmdonev: /* R-values of Common Materials */

2018-05-18T20:52:50Z

R-values of Common Materials

← Older revision		Revision as of 20:52, 18 May 2018
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	[[Category:Done ~~2015~~-07-24]]		[[Category:Done 2018-05-18]]
	[[File:Aerogel.jpg\|framed\|right\|Figure 1. The photo above shows Aerogel, an extremely good thermal insulator, between a blowtorch and matches. The insulating properties of the Aerogel prevent the matches from burning.<ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref>]]		[[File:Aerogel.jpg\|framed\|right\|Figure 1. The photo above shows Aerogel, an extremely good thermal insulator, between a blowtorch and matches. The insulating properties of the Aerogel prevent the matches from burning.<ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref>]]
	<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].		<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].

	==Housing Insulation==		==Housing Insulation==
	In most climates the exterior [[temperature]] is very different from the desired interior temperature. This is why people [[heat]] or cool their [[home heating\|homes]]. These systems require [[energy]] to operate - the purpose of insulation is to allow the internal [[temperature]] of the building to be as unrelated as possible to the external temperature. If a building is insulated properly, this can result in large [[efficiency\|energy savings]]. This is beneficial from an economical, environmental and social point of view.		In most climates the exterior [[temperature]] is very different from the desired interior temperature. This is why people [[heat]] or cool their [[home heating\|homes]]. These systems require [[energy]] to operate so the purpose of insulation is to allow the internal [[temperature]] of the building to be as unrelated as possible to the external temperature. If a building is insulated properly, this can result in large [[efficiency\|energy savings]]. This is beneficial from an economical, environmental and social point of view.

	===R-value===		===R-value===
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	The R-value is found using the following formula:		The R-value is found using the following formula:

	<center~~><m~~> R-value = \Delta T / Q_{A} </m></center~~> <br /~~>		<center>R-value <math> = \frac{\Delta T}{ Q_{A}} </math></center>
	* <m>\Delta T</m> is the temperature difference on each side of the material		* <math>\Delta T</math> is the temperature difference on each side of the material
	* <m>Q_A</m> is the heat transfer per area per time<br />		* <math>Q_A</math> is the heat transfer per area per time<br />
	The SI units of an R-value are m<sup>2</sup>·K/W		The SI units of an R-value are m<sup>2</sup>·K/W
	~~<br />~~
	~~<br />~~
	Since the R-value is inversely proportional to the heat transfer through the object, the higher the R-value, the better the insulator. That is, the greater the R-value, the greater the resistance to [[heat transfer]]. A typical 2"x4" wall assembly, insulated with fibreglass batt insulation, will have and R-value of about 13.73.<ref>All Wall Systems. (July 30, 2015). ''R-Values'' [Online]. Available: http://www.allwallsystem.com/design/RValueTable.html</ref> Fibreglass insulation is one of the most common types of insulation in walls. The R-value is reduced to 2.73 when the insulation is removed. R-values can be added normally. So if two materials are together the total R-value is just the R value of one plus the R-value of the other.		Since the R-value is inversely proportional to the heat transfer through the object, the higher the R-value, the better the insulator. That is, the greater the R-value, the greater the resistance to [[heat transfer]]. A typical 2"x4" wall assembly, insulated with fibreglass batt insulation, will have and R-value of about 13.73.<ref>All Wall Systems. (July 30, 2015). ''R-Values'' [Online]. Available: http://www.allwallsystem.com/design/RValueTable.html</ref> Fibreglass insulation is one of the most common types of insulation in walls. The R-value is reduced to 2.73 when the insulation is removed. R-values can be added normally. So if two materials are together the total R-value is just the R value of one plus the R-value of the other.

	=== R-values of Common Materials ===		=== R-values of Common Materials ===
			Below is a table of R-values.<ref>Grassroots. (July 30, 2015). ''Building Material R-Values'' [Online]. Available: http://www.grassroots.ca/homeowner_help_articles/building-material-r-values.php</ref>
	<center>		<center>
	{\| class="wikitable"		{\| class="wikitable"
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	\| Stucco \|\| 0.20 \|\| Silica Aerogel<ref>HubPages. (July 30, 2015). ''AeroGel - The Perfect Home Insulation'' [Online]. Available: http://liambean.hubpages.com/hub/AeroGel-The-Perfect-Home-Insulation</ref> \|\| 10.3		\| Stucco \|\| 0.20 \|\| Silica Aerogel<ref>HubPages. (July 30, 2015). ''AeroGel - The Perfect Home Insulation'' [Online]. Available: http://liambean.hubpages.com/hub/AeroGel-The-Perfect-Home-Insulation</ref> \|\| 10.3
	\|}		\|}
	~~<ref>Grassroots. (July 30, 2015). ''Building Material R-Values'' [Online]. Available: http://www.grassroots.ca/homeowner_help_articles/building-material-r-values.php</ref>~~
	</center>		</center>

J.williams: 1 revision imported

2015-08-26T21:31:43Z

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J.williams at 17:00, 12 August 2015

2015-08-12T17:00:14Z

New page

[[Category:Done 2015-07-24]]
[[File:Aerogel.jpg|framed|right|Figure 1. The photo above shows Aerogel, an extremely good thermal insulator, between a blowtorch and matches. The insulating properties of the Aerogel prevent the matches from burning.<ref>Wikimedia Commons. (July 30, 2015). ''Aerogel'' [Online]. Available: https://upload.wikimedia.org/wikipedia/commons/b/b4/Aerogel_matches.jpg</ref>]]
<onlyinclude>'''Insulation''' is the term used for a variety of materials used to reduce [[heat transfer]]. It is part of the [[building envelope]], used to limit heat loss through walls, roofs or floors.</onlyinclude> There's also [[electrical insulation]], which is similar but for [[electricity]].

==Housing Insulation==
In most climates the exterior [[temperature]] is very different from the desired interior temperature. This is why people [[heat]] or cool their [[home heating|homes]]. These systems require [[energy]] to operate - the purpose of insulation is to allow the internal [[temperature]] of the building to be as unrelated as possible to the external temperature. If a building is insulated properly, this can result in large [[efficiency|energy savings]]. This is beneficial from an economical, environmental and social point of view.

===R-value===
Because of the large number of insulation types on the market, it is important to have a common rating system. North America uses a unit called the [[R-value]] (Resistance value) to measure the performance of an insulation. The Metric unit for thermal resistivity is the [[RSI]]. The R-value measures the material's resistance to thermal [[conduction]]. It is important to note that [[heat transfer]] occurs through three different mechanism; [[conduction]], [[convection]] and [[radiation]]. A limitation of the R-value is that it only accounts for [[conduction]]. This can result in a slightly inaccurate representation of the true resistance to thermal transfer of a material. R-values, however, are a simple way to compare materials' insulating qualities

The R-value is found using the following formula:

<center><m> R-value = \Delta T / Q_{A} </m></center> 
* <m>\Delta T</m> is the temperature difference on each side of the material
* <m>Q_A</m> is the heat transfer per area per time 
The SI units of an R-value are m2·K/W
 
 
Since the R-value is inversely proportional to the heat transfer through the object, the higher the R-value, the better the insulator. That is, the greater the R-value, the greater the resistance to [[heat transfer]]. A typical 2"x4" wall assembly, insulated with fibreglass batt insulation, will have and R-value of about 13.73.<ref>All Wall Systems. (July 30, 2015). ''R-Values'' [Online]. Available: http://www.allwallsystem.com/design/RValueTable.html</ref> Fibreglass insulation is one of the most common types of insulation in walls. The R-value is reduced to 2.73 when the insulation is removed. R-values can be added normally. So if two materials are together the total R-value is just the R value of one plus the R-value of the other.

=== R-values of Common Materials ===
<center>
{| class="wikitable"
|-
! Material !! R-value per inch !! Insulation !! R-value per inch
|-
| Drywall || 0.90 || Fibreglass Batts || 3.0 - 3.8
|-
| Hardwood || 0.90 || Cellulose || 2.8 - 3.7
|-
| Sand and Gravel|| 0.09 || Rigid Board - Extruded Polystyrene || 5.0 - 6.3
|-
| Cement Mortar || 0.20 || Spray-Foam Polyurethane || 5.6 - 6.2
|-
| Brick || 0.20 || Vacuum Insulated Panels<ref>Dow Corning. (July 30, 2015). ''Insulation'' [Online]. http://www.dowcorning.com/content/publishedlit/62-1556-01.pdf</ref> || 39
|-
| Stucco || 0.20 || Silica Aerogel<ref>HubPages. (July 30, 2015). ''AeroGel - The Perfect Home Insulation'' [Online]. Available: http://liambean.hubpages.com/hub/AeroGel-The-Perfect-Home-Insulation</ref> || 10.3
|}
<ref>Grassroots. (July 30, 2015). ''Building Material R-Values'' [Online]. Available: http://www.grassroots.ca/homeowner_help_articles/building-material-r-values.php</ref>
</center>

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