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Thermal insulation in buildings is an important factor to achieving thermal comfort for its occupants. Insulation reduces unwanted heat loss or gain and can decrease the energy demands of heating and cooling systems. It does not necessarily deal with issues of adequate ventilation and may or may not affect the level of sound insulation. The main modes of heat transfer - conduction, radiation and convection can be reduced through appropriate construction techniques and choice of materials.[1][2] Image File history File links Size of this preview: 800 × 583 pixelsFull resolution (4718 × 3440 pixel, file size: 1. ...
Image File history File links Size of this preview: 800 × 583 pixelsFull resolution (4718 × 3440 pixel, file size: 1. ...
This article does not cite any references or sources. ...
Old Executive Office Building, Washington D.C. Bank of China Tower, Hong Kong, China In architecture, construction, engineering and real estate development the word building may refer to one of the following: Any man-made structure used or intended for supporting or sheltering any use or continuous occupancy, or An...
Motto: Pride in our past, Faith in our future Area: 288. ...
Motto: Ut Incepit Fidelis Sic Permanet (Latin: Loyal she began, loyal she remains) Capital Toronto Largest city Toronto Official languages English (de facto) Government - Lieutenant-Governor David C. Onley - Premier Dalton McGuinty (Liberal) Federal representation in Canadian Parliament - House seats 106 - Senate seats 24 Confederation July 1, 1867 (1st) Area...
Thermal insulation on the Huygens probe The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. ...
Human thermal comfort is the state of mind that expresses satisfaction with the surrounding environment, according to ASHRAE Standard 55. ...
HVAC may also stand for High-voltage alternating current HVAC systems use ventilation air ducts installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called diffusers; and ducts that remove air from return-air grilles Fire-resistance rated mechanical shaft with HVAC...
Ventilation good and very bad Ventilation is air circulation of air, typically between a room, a tunnel, etc. ...
It has been suggested that Sound diffuser be merged into this article or section. ...
Design and Construction
Passive Solar Design -
Optimal placement of building elements (e.g. windows, doors, heaters) can play a significant role in insulation by considering the impact of solar radiation on the building. (See Passive Solar Design) An architectural engineer applies the skills of many engineering disciplines to the design, construction, operation, maintenance, and renovation of buildings while paying attention to their impacts on the surrounding environment. ...
Radiant energy is the energy of electromagnetic waves. ...
Passive solar building design involves the modeling, selection and use of appropriate passive solar technologies to maintain the building environment at a desired temperature range (usually based around human thermal comfort) throughout the suns daily and annual cycles. ...
See insulated glass for discussion of windows. Insulated glazing is a piece of glazing consisting of two or more layers of glazing separated by a spacer along the edge and sealed to create a dead air space between the layers. ...
Airtight envelope -
Attention to building construction (weatherization) and the correct installation of insulative materials is a critical component in achieving optimal thermal performance.[3] [4] A building envelope is the exterior assembly that encloses the interior space of a building. ...
Weatherization (American English) or weatherproofing (British English) is the practice of protecting a building and its interior from the elements, particularly from sunlight, precipitation, and wind, and of modifying a building to reduce energy consumption and optimize energy efficiency. ...
The thermal envelope defines the conditioned or living space in a house. The attic or basement may or may not be included in this area. Air movement contributes significantly to convective heat loss or gain. Depending on climate, up to 40% of a building's heat loss or gain is due to air leaks [5]. Reducing air infiltration is the first step in insulating a building and is quite difficult to achieve. Quality of work is the key. Good weatherization is vital to allow most insulation products to work properly. A building envelope is the exterior assembly that encloses the interior space of a building. ...
Weatherization (American English) or weatherproofing (British English) is the practice of protecting a building and its interior from the elements, particularly from sunlight, precipitation, and wind, and of modifying a building to reduce energy consumption and optimize energy efficiency. ...
With an airtight building, consideration also must be made to appropriate ventilation and moisture control. Excessive humidity and/or condensation can be significant issues. Excessive moisture (or invisible humidity) can rot construction materials and/or encourage microbial growth eg. mold, bacteria. Moisture can also drastically reduce the effectiveness of insulation by creating a thermal bridge(see below). Air exchange systems can be actively or passively incorporated to address these problems. Humidity is the amount of water vapor in air. ...
For other uses, see Condensation (disambiguation). ...
This article is about the fungi known as molds. ...
Phyla Actinobacteria Aquificae Chlamydiae Bacteroidetes/Chlorobi Chloroflexi Chrysiogenetes Cyanobacteria Deferribacteres Deinococcus-Thermus Dictyoglomi Fibrobacteres/Acidobacteria Firmicutes Fusobacteria Gemmatimonadetes Lentisphaerae Nitrospirae Planctomycetes Proteobacteria Spirochaetes Thermodesulfobacteria Thermomicrobia Thermotogae Verrucomicrobia Bacteria (singular: bacterium) are unicellular microorganisms. ...
A heat exchanger is a device for transferring heat from one fluid to another, where the fluids are separated by a solid wall so that they never mix. ...
Insulation materials -
There are many different building insulation materials used to provide thermal insulation. For details, see building insulation materials. Due to this variety and the various building elements that may require insulation, there are a number of ways of installing building insulation. There are many different building insulation materials used to provide building insulation. ...
Due to the variety of building insulation materials available and the various building elements that may require insulation, there are a number of ways of installing building insulation. ...
Thermal insulation on the Huygens probe The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. ...
There are many different building insulation materials used to provide building insulation. ...
Due to the variety of building insulation materials available and the various building elements that may require insulation, there are a number of ways of installing building insulation. ...
- See also thermal conductivity
K value redirects here. ...
Thickness and effectiveness of insulation -
Main articles: R-value (insulation) and R-value The R (Resistance) value of a given material with known thickness indicates its resistance to conductive heat transfer. R values are not necessarily linearly related to thickness e.g. a material twice as thick may not yield double the R-value. R-value is a term predominantly used in the building industry to rate the insulative properties of construction materials and building assemblies. ...
The R-value is a measure of thermal resistance. ...
How much insulation a house should have depends on building design, climate, energy costs, budget, and personal preference. Regional climates make for different requirements as to R-values of each component of a building. Building codes specify only the bare minimum; insulating beyond what code requires is often recommended. An initial estimate of insulation needs can be determined by the Department of Energy's Zip-code insulation calculator. A building code, or building control, is a set of rules that specify the minimum acceptable level of safety for constructed objects such as buildings and nonbuilding structures. ...
Insulating as tightly and completely as one can while building a house is much easier than retrofitting. For example, if a closed-cell foam gasket is not installed to the sill plate when a house is under construction, there is no way to install it afterwards.
Obtaining advice In a home energy audit, professionals evaluate the energy efficiency of the home, using blower doors, infra-red cameras, and other air leakage measuring equipment. They identify the greatest leaks and recommend the best ways to improve the energy efficiency of your house. They tell you what you should do first for the best efficiency.
Whom to call for a home energy audit:
- Public utility companies, or their energy conservation department.
- Independent, private-sector companies such as energy services company, insulation contractor, or air sealing specialist.
- State energy office.
- Websites for any of the above.
Utility companies are usually eager to provide this service, as well as loans and other incentives to insulate. They also often provide incentives to switch, for example, if you are an oil customer considering switching to natural gas.
Where to look for insulation recommendations:
- Local building inspector’s office.
- Local or state building codes.
- US Department of Energy.
- Websites for any of the above.
See also Image File history File links Portal. ...
Mineral wool, means fibres made from minerals or metal oxides, be they synthetic or natural. ...
For the dismabiguation page, see Packing. ...
Due to the variety of building insulation materials available and the various building elements that may require insulation, there are a number of ways of installing building insulation. ...
There are many different building insulation materials used to provide building insulation. ...
Superinsulation is an approach to building design, construction and retrofitting. ...
R-value is a term predominantly used in the building industry to rate the insulative properties of construction materials and building assemblies. ...
One of the original Passive Houses at Darmstadt, Germany One of the original Passive Houses at Darmstadt The term passive house (Passivhaus in German) refers to the rigorous, voluntary, Passivhaus standard for energy use in buildings. ...
Similar or related terms: Near zero energy building, Zero energy house, Near zero energy house A zero energy building (ZEB) can be described as structure with a net energy consumption of zero over a typical year. ...
Wool insulation is made from sheep wool that is mechanically bonded together to form insulating batts and ropes. ...
Construction on the North Bytown Bridge in Ottawa, Canada. ...
A building envelope is the exterior assembly that encloses the interior space of a building. ...
Weatherization (American English) or weatherproofing (British English) is the practice of protecting a building and its interior from the elements, particularly from sunlight, precipitation, and wind, and of modifying a building to reduce energy consumption and optimize energy efficiency. ...
For other uses, see Condensation (disambiguation). ...
Thermal mass, in the most general sense, is any mass that absorbs and holds heat. ...
Thermal insulation on the Huygens probe The term thermal insulation can refer to materials used to reduce the rate of heat transfer, or the methods and processes used to reduce heat transfer. ...
Generically, a low-energy house is any type of house that uses less energy than a regular house. ...
HVAC may also stand for High-voltage alternating current HVAC systems use ventilation air ducts installed throughout a building that supply conditioned air to a room through rectangular or round outlet vents, called diffusers; and ducts that remove air from return-air grilles Fire-resistance rated mechanical shaft with HVAC...
Ventilation good and very bad Ventilation is air circulation of air, typically between a room, a tunnel, etc. ...
References - ^ http://www.buildingscience.com/documents/digests/bsd-011-thermal-control-in-buildings/
- ^ http://www.greenhouse.gov.au/yourhome/technical/fs16a.htm
- ^ http://www.eere.energy.gov/buildings/info/design/integratedbuilding/buildingenvelope.html
- ^ http://www.energystar.gov/ia/new_homes/features/VEFraming1-17-01.pdf
- ^ http://www.ornl.gov/sci/roofs+walls/whole_wall/airtight.html
External links - Article on insulation for older properties
- Rvalues: Myths and Reality
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