Window-U-Factor - Revision history

Simcha at 21:35, 18 March 2013

2013-03-18T21:35:18Z

← Older revision		Revision as of 21:35, 18 March 2013
Line 38:		Line 38:
	== U-Factors in Varying Climates ==		== U-Factors in Varying Climates ==
	Homes located in colder climates should include windows with low U-factors.		Homes located in colder climates should include windows with low U-factors.
		+
		+
		+	{{Energy Efficient Windows‎}}

	[[Category:Replacement Windows]]		[[Category:Replacement Windows]]

Simcha at 19:50, 7 February 2013

2013-02-07T19:50:24Z

← Older revision		Revision as of 19:50, 7 February 2013
Line 7:		Line 7:
	\|data8 = A window rating that indicates it's level of thermal insulation.}}		\|data8 = A window rating that indicates it's level of thermal insulation.}}

−	A '''~~window~~'s U-Factor''' indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This measurement is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].	+	A window's '''U-Factor''' indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This measurement is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].

	== Measuring the U-Factor ==		== Measuring the U-Factor ==

Simcha at 19:48, 7 February 2013

2013-02-07T19:48:24Z

← Older revision		Revision as of 19:48, 7 February 2013
Line 15:		Line 15:
	The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC).		The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC).

−	=== ~~National Fenestration Ratings Council~~ Ratings ===	+	=== NFRC Ratings ===
	The U-Factor sometimes refers to just the glass or glazing alone but the [[National Fenestration Ratings Council\|National Fenestration Ratings Council]], whose ratings are accepted as industry standards, assesses the entire window performance, including frame and spacer material. These ratings include the U-Factor, the Solar Heat Gain Coefficient and Air Leakage.		The U-Factor sometimes refers to just the glass or glazing alone but the [[National Fenestration Ratings Council\|National Fenestration Ratings Council]], whose ratings are accepted as industry standards, assesses the entire window performance, including frame and spacer material. These ratings include the U-Factor, the Solar Heat Gain Coefficient and Air Leakage.

Simcha at 19:47, 7 February 2013

2013-02-07T19:47:54Z

← Older revision		Revision as of 19:47, 7 February 2013
Line 10:		Line 10:

	== Measuring the U-Factor ==		== Measuring the U-Factor ==
−	The U-Factor refers to a window's overall heat transfer ~~coefficient~~. Using standardized conditions the U-Factor measures the rate of heat transfer that passes through a window. Smaller U-Factors have the highest potential reduce heat transfer.	+	The U-Factor refers to a window's overall heat transfer coefficientcy. Using standardized conditions, the U-Factor measures the rate of heat transfer that passes through a window. Smaller U-Factors have the highest potential reduce heat transfer.

	== Measuring Heat Gain & Heat Loss ==		== Measuring Heat Gain & Heat Loss ==
Line 19:		Line 19:

	=== Energy Star Ratings ===		=== Energy Star Ratings ===
−	[[~~Energy Star\|~~Energy-Star-Windows ]] ~~windows~~ whose label is recognized for purposes of government tax credits and rebates, only bases its qualification on the U-factor and the Solar Heat Gain Coefficient ratings. The Energy Star label is granted based on ratings for the U-Factor and the Solar Heat Gain Coefficient as measured by the ~~national~~ Fenestration Ratings Council.	+	[[Energy-Star-Windows\|Energy Star windows]] whose label is recognized for purposes of government tax credits and rebates, only bases its qualification on the U-factor and the Solar Heat Gain Coefficient ratings. The Energy Star label is granted based on ratings for the U-Factor and the Solar Heat Gain Coefficient as measured by the National Fenestration Ratings Council.

	=== U-Factor ===		=== U-Factor ===

Simcha: /* Measuring Heat Gain and Heat Loss */

2013-02-07T19:42:57Z

Measuring Heat Gain and Heat Loss

← Older revision		Revision as of 19:42, 7 February 2013
Line 12:		Line 12:
	The U-Factor refers to a window's overall heat transfer coefficient. Using standardized conditions the U-Factor measures the rate of heat transfer that passes through a window. Smaller U-Factors have the highest potential reduce heat transfer.		The U-Factor refers to a window's overall heat transfer coefficient. Using standardized conditions the U-Factor measures the rate of heat transfer that passes through a window. Smaller U-Factors have the highest potential reduce heat transfer.

−	== Measuring Heat Gain ~~and~~ Heat Loss ==	+	== Measuring Heat Gain & Heat Loss ==
	The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC).		The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC).

Simcha at 19:42, 7 February 2013

2013-02-07T19:42:29Z

← Older revision		Revision as of 19:42, 7 February 2013
Line 7:		Line 7:
	\|data8 = A window rating that indicates it's level of thermal insulation.}}		\|data8 = A window rating that indicates it's level of thermal insulation.}}

−	A '''window's U-Factor''' indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This ~~[[Energy Efficient Windows\|~~measurement]] is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].	+	A '''window's U-Factor''' indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This measurement is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].

	== Measuring the U-Factor ==		== Measuring the U-Factor ==

Simcha at 19:40, 7 February 2013

2013-02-07T19:40:41Z

← Older revision		Revision as of 19:40, 7 February 2013
Line 1:		Line 1:
	{{Infobox		{{Infobox
	\|title = Window U-Factor		\|title = Window U-Factor
−	\|image = [[File:Space holder.jpg\|215px\|alt=~~Block Glass Windows~~]]	+	\|image = [[File:Space holder.jpg\|215px\|alt=Window U-Factor]]
−	\|header5 = ~~Window U-Factor~~	+	\|header5 = Other Names:
−	\|data6 = Replacement Window U-Factor	+	\|data6 = Replacement Window U-Factor, U-Factor Rating
	\|header7 = Description:		\|header7 = Description:
−	\|data8 = ~~Replacement window customers will want to ascertain a replacement~~ window's ~~U-Factor which will indicate the~~ level of thermal insulation ~~that the window offers~~}}	+	\|data8 = A window rating that indicates it's level of thermal insulation.}}

−	A window's U-Factor indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This [[Energy Efficient Windows\|measurement]] is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].	+	A '''window's U-Factor''' indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This [[Energy Efficient Windows\|measurement]] is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].

	== Measuring the U-Factor ==		== Measuring the U-Factor ==

Simcha at 19:38, 7 February 2013

2013-02-07T19:38:19Z

Laurierappeport at 18:44, 12 September 2012

2012-09-12T18:44:49Z

← Older revision		Revision as of 18:44, 12 September 2012
Line 18:		Line 18:
	=== U-Factor ===		=== U-Factor ===
	The U-factor measures the rate at which a window conducts non-solar heat flow. The lower the U-factor, the more energy-efficient the window.		The U-factor measures the rate at which a window conducts non-solar heat flow. The lower the U-factor, the more energy-efficient the window.
		+	==== Center-of-Glass U-Factor ====
		+	The National Fenestration Ratings Council offers a nationally recognized method of rating windows. The ratings provided by the NFRC assess the total window performance including the frame, spacers and glazing. The Center-of-Glass U-Factor is sometimes indicated separately. Center-of-Glass only describes the performance of the window's glazing and does not include the effects of the framing material. Homeowners should be aware that the most energy efficient windows will have a higher whole window U-factor than the center-of-glass U-factor.
	=== Solar Heat Gain Coefficient ===		=== Solar Heat Gain Coefficient ===
	The Solar Heat Gain Coefficient is the fraction of solar radiation which is admitted through a window. It is either directly transmitted and/or absorbed. The SHGF is subsequently released as heat within a building.		The Solar Heat Gain Coefficient is the fraction of solar radiation which is admitted through a window. It is either directly transmitted and/or absorbed. The SHGF is subsequently released as heat within a building.
	=== Air Leakage ===		=== Air Leakage ===
	Air Leakage refers to the rate of air movement surrounding a window. Air Leakage is expressed in units of cubic feet per minute per square foot of frame area. A window unit with a high Air Leakage is not as tight as one with a low air leakage rating.		Air Leakage refers to the rate of air movement surrounding a window. Air Leakage is expressed in units of cubic feet per minute per square foot of frame area. A window unit with a high Air Leakage is not as tight as one with a low air leakage rating.
−	~~== Center-of-Glass U-Factor ==~~	+
−	The National Fenestration Ratings Council offers a nationally recognized method of rating windows. The ratings provided by the NFRC assess the total window performance including the frame, spacers and glazing. The Center-of-Glass U-Factor is sometimes indicated separately. Center-of-Glass only describes the performance of the window's glazing and does not include the effects of the framing material. Homeowners should be aware that the most energy efficient windows will have a higher whole window U-factor than the center-of-glass U-factor.	+

	== U-Factor Averages ==		== U-Factor Averages ==

Laurierappeport: /* Center-of-Glass U-Factor */

2012-09-12T18:42:07Z

Center-of-Glass U-Factor

← Older revision		Revision as of 18:42, 12 September 2012
Line 23:		Line 23:
	Air Leakage refers to the rate of air movement surrounding a window. Air Leakage is expressed in units of cubic feet per minute per square foot of frame area. A window unit with a high Air Leakage is not as tight as one with a low air leakage rating.		Air Leakage refers to the rate of air movement surrounding a window. Air Leakage is expressed in units of cubic feet per minute per square foot of frame area. A window unit with a high Air Leakage is not as tight as one with a low air leakage rating.
	== Center-of-Glass U-Factor ==		== Center-of-Glass U-Factor ==
−	The National Fenestration Ratings Council offers a nationally recognized ~~rating~~ method. The ratings provided by the ~~NFRCassesses~~ the total window performance including the frame, spacers and glazing. The Center-of-Glass U-Factor is sometimes indicated. Center-of-Glass only describes the performance of the window's glazing and does not include the effects of the framing material. Homeowners should be aware that the most energy efficient windows will have a higher whole window U-factor than the center-of-glass U-factor.	+	The National Fenestration Ratings Council offers a nationally recognized method of rating windows. The ratings provided by the NFRC assess the total window performance including the frame, spacers and glazing. The Center-of-Glass U-Factor is sometimes indicated separately. Center-of-Glass only describes the performance of the window's glazing and does not include the effects of the framing material. Homeowners should be aware that the most energy efficient windows will have a higher whole window U-factor than the center-of-glass U-factor.
		+
	== U-Factor Averages ==		== U-Factor Averages ==
	High thermal performance double-glazed windows will display a U-factor of 0.30 or lower. Some high performance triple-glazed windows can achieve a U-factor of as low as 0.15.		High thermal performance double-glazed windows will display a U-factor of 0.30 or lower. Some high performance triple-glazed windows can achieve a U-factor of as low as 0.15.
	== U-Factors in Varying Climates ==		== U-Factors in Varying Climates ==
	Homes located in colder climates should include windows with low U-factors.		Homes located in colder climates should include windows with low U-factors.

← Older revision		Revision as of 19:38, 7 February 2013
Line 8:		Line 8:

	A window's U-Factor indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This [[Energy Efficient Windows\|measurement]] is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].		A window's U-Factor indicates the rate of heat loss of a window unit. Window manufacturers measure a window's resistance by its insulating properties. This [[Energy Efficient Windows\|measurement]] is indicated as a U-Factor. The lower a U-Factor, the higher the level of a window's [[Thermal Windows\|thermal insulation]].
		+
	== Measuring the U-Factor ==		== Measuring the U-Factor ==
	The U-Factor refers to a window's overall heat transfer coefficient. Using standardized conditions the U-Factor measures the rate of heat transfer that passes through a window. Smaller U-Factors have the highest potential reduce heat transfer.		The U-Factor refers to a window's overall heat transfer coefficient. Using standardized conditions the U-Factor measures the rate of heat transfer that passes through a window. Smaller U-Factors have the highest potential reduce heat transfer.
		+
	== Measuring Heat Gain and Heat Loss ==		== Measuring Heat Gain and Heat Loss ==
−	The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC).	+	The U-Factor is just one of the components that measures the rate at which a window loses and gains heat. A window's total thermal insulation is measured by the U-Factor along with Air Leakage (AL) and the Solar Heat Gain Coefficient (SHGC).
		+
	=== National Fenestration Ratings Council Ratings ===		=== National Fenestration Ratings Council Ratings ===
	The U-Factor sometimes refers to just the glass or glazing alone but the [[National Fenestration Ratings Council\|National Fenestration Ratings Council]], whose ratings are accepted as industry standards, assesses the entire window performance, including frame and spacer material. These ratings include the U-Factor, the Solar Heat Gain Coefficient and Air Leakage.		The U-Factor sometimes refers to just the glass or glazing alone but the [[National Fenestration Ratings Council\|National Fenestration Ratings Council]], whose ratings are accepted as industry standards, assesses the entire window performance, including frame and spacer material. These ratings include the U-Factor, the Solar Heat Gain Coefficient and Air Leakage.
		+
	=== Energy Star Ratings ===		=== Energy Star Ratings ===
−	[[Energy Star\|Energy-Star-Windows ]] windows whose label is recognized for purposes of government tax credits and rebates, only bases its qualification on the U-factor and the Solar Heat Gain Coefficient ratings. The Energy Star label is granted based on ratings for the U-Factor and the Solar Heat Gain Coefficient as measured by the national Fenestration Ratings Council.	+	[[Energy Star\|Energy-Star-Windows ]] windows whose label is recognized for purposes of government tax credits and rebates, only bases its qualification on the U-factor and the Solar Heat Gain Coefficient ratings. The Energy Star label is granted based on ratings for the U-Factor and the Solar Heat Gain Coefficient as measured by the national Fenestration Ratings Council.
		+
	=== U-Factor ===		=== U-Factor ===
	The U-factor measures the rate at which a window conducts non-solar heat flow. The lower the U-factor, the more energy-efficient the window.		The U-factor measures the rate at which a window conducts non-solar heat flow. The lower the U-factor, the more energy-efficient the window.
		+
	==== Center-of-Glass U-Factor ====		==== Center-of-Glass U-Factor ====
	The National Fenestration Ratings Council offers a nationally recognized method of rating windows. The ratings provided by the NFRC assess the total window performance including the frame, spacers and glazing. The Center-of-Glass U-Factor is sometimes indicated separately. Center-of-Glass only describes the performance of the window's glazing and does not include the effects of the framing material. Homeowners should be aware that the most energy efficient windows will have a higher whole window U-factor than the center-of-glass U-factor.		The National Fenestration Ratings Council offers a nationally recognized method of rating windows. The ratings provided by the NFRC assess the total window performance including the frame, spacers and glazing. The Center-of-Glass U-Factor is sometimes indicated separately. Center-of-Glass only describes the performance of the window's glazing and does not include the effects of the framing material. Homeowners should be aware that the most energy efficient windows will have a higher whole window U-factor than the center-of-glass U-factor.
		+
	=== Solar Heat Gain Coefficient ===		=== Solar Heat Gain Coefficient ===
	The Solar Heat Gain Coefficient is the fraction of solar radiation which is admitted through a window. It is either directly transmitted and/or absorbed. The SHGF is subsequently released as heat within a building.		The Solar Heat Gain Coefficient is the fraction of solar radiation which is admitted through a window. It is either directly transmitted and/or absorbed. The SHGF is subsequently released as heat within a building.
		+
	=== Air Leakage ===		=== Air Leakage ===
	Air Leakage refers to the rate of air movement surrounding a window. Air Leakage is expressed in units of cubic feet per minute per square foot of frame area. A window unit with a high Air Leakage is not as tight as one with a low air leakage rating.		Air Leakage refers to the rate of air movement surrounding a window. Air Leakage is expressed in units of cubic feet per minute per square foot of frame area. A window unit with a high Air Leakage is not as tight as one with a low air leakage rating.
−

	== U-Factor Averages ==		== U-Factor Averages ==
	High thermal performance double-glazed windows will display a U-factor of 0.30 or lower. Some high performance triple-glazed windows can achieve a U-factor of as low as 0.15.		High thermal performance double-glazed windows will display a U-factor of 0.30 or lower. Some high performance triple-glazed windows can achieve a U-factor of as low as 0.15.
		+
	== U-Factors in Varying Climates ==		== U-Factors in Varying Climates ==
	Homes located in colder climates should include windows with low U-factors.		Homes located in colder climates should include windows with low U-factors.
		+
		+	[[Category:Replacement Windows]]