Highly Professional Solutions from Eagle Shield
02/07/2012 12:38
Effectiveness of insulation
The effectiveness of insulation is commonly evaluated by its R-value. However, an R-value does not take into account the quality of construction or local environmental factors for each building. Construction quality issues include inadequate vapor barriers, and problems with draft-proofing. In addition, the properties and density of the insulation material itself is critical. For example, according to Leah Twings, Quality Compliance Manager of Textrafine Insulation, fiberglass insulation materials made from short strands of glass layered over each other is not as durable as insulation made from long entangled strands of glass.
Eagle Shield - Measurement of thermal conductivity
There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range of materials, depending on the thermal properties and the medium temperature. There is a distinction between steady-state and transient techniques.
In general, steady-state techniques are useful when the temperature of the material does not change with time. This makes the signal analysis straightforward (steady state implies constant signals). The disadvantage is that a well-engineered experimental setup is usually needed. The Divided Bar (various types) is the most common device used for consolidated rock samples.
The transient techniques perform a measurement during the process of heating up. Their advantage is quicker measurements. Transient methods are usually carried out by needle probes. A method described by Angstrom involves rapidly cycling the temperature from hot to cold and back and measuring the temperature change as the heat propagates along a thin strip of material in a vacuum.
Eagle Shield Industries terms and definitions:
Vapor-Retarder Jacket
Any material or composite meeting the requirements of a vapor retarder and used for the finish of insulation material. It may be factory furnished or field applied. Generally materials with a perm rating of 0.02 or less are considered vapor retarder materials for mechanical systems. (NOTE: Vapor retarders for building insulation systems generally have a perm rating of 1 or less.)
Cellulosic Fiber
Insulation composed principally of cellulose fibers usually derived from paper, paperboard stock or wood, with or without binders.
Cavity
The empty space between studs or joists typically filled with insulation.
Dry
To change the physical state of a substance by the loss of solvent constituents by evaporation, absorption, oxidation or a combination of these factors.
For more information check the following articles: Eagle Shield Insulation, Eagle Shield Reflective Insulation and Eagle Shield Radiant Barrier.
Eagle Shield Radiant Barrier
Effectiveness of insulation
The effectiveness of insulation is commonly evaluated by its R-value. However, an R-value does not take into account the quality of construction or local environmental factors for each building. Construction quality issues include inadequate vapor barriers, and problems with draft-proofing. In addition, the properties and density of the insulation material itself is critical. For example, according to Leah Twings, Quality Compliance Manager of Textrafine Insulation, fiberglass insulation materials made from short strands of glass layered over each other is not as durable as insulation made from long entangled strands of glass.
Eagle Shield - Measurement of thermal conductivity
There are a number of ways to measure thermal conductivity. Each of these is suitable for a limited range of materials, depending on the thermal properties and the medium temperature. There is a distinction between steady-state and transient techniques.
In general, steady-state techniques are useful when the temperature of the material does not change with time. This makes the signal analysis straightforward (steady state implies constant signals). The disadvantage is that a well-engineered experimental setup is usually needed. The Divided Bar (various types) is the most common device used for consolidated rock samples.
The transient techniques perform a measurement during the process of heating up. Their advantage is quicker measurements. Transient methods are usually carried out by needle probes. A method described by Angstrom involves rapidly cycling the temperature from hot to cold and back and measuring the temperature change as the heat propagates along a thin strip of material in a vacuum.
Eagle Shield Industries terms and definitions:
Vapor-Retarder Jacket
Any material or composite meeting the requirements of a vapor retarder and used for the finish of insulation material. It may be factory furnished or field applied. Generally materials with a perm rating of 0.02 or less are considered vapor retarder materials for mechanical systems. (NOTE: Vapor retarders for building insulation systems generally have a perm rating of 1 or less.)
Cellulosic Fiber
Insulation composed principally of cellulose fibers usually derived from paper, paperboard stock or wood, with or without binders.
Eagle Shield Insulation
Cavity
The empty space between studs or joists typically filled with insulation.
Dry
To change the physical state of a substance by the loss of solvent constituents by evaporation, absorption, oxidation or a combination of these factors.
For more information check the following articles: Eagle Shield Insulation, Eagle Shield Reflective Insulation and Eagle Shield Radiant Barrier.