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utvalue
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There are 7 letters in UTVALUE ( A1E1L1T1U1V4 )
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In building and construction, the R-value is a measure of how well an object, per unit of its exposed area, resists conductive flow of heat: the greater the R-value, the greater the resistance, and so the better the thermal insulating properties of the object. R-values are used in describing effectiveness of insulation and in analysis of heat flow across assemblies (such as walls, roofs, and windows) under steady-state conditions. Heat flow through an object is driven by temperature difference (e.g. * * * * * T * * 2 * * * − * * T * * 1 * * * * * {\displaystyle T_{2}-T_{1}} * ) between two sides of the object, and the R-value quantifies how effectively the object resists this drive: * * * * * T * * 2 * * * − * * T * * 1 * * * * * {\displaystyle T_{2}-T_{1}} * divided by the R-value and then multiplied by the surface area of the object's side gives the total rate of heat flow through the object (as measured in Watts or in BTUs per hour). Moreover, as long as the materials involved are dense solids in direct mutual contact, R-values are additive; for example, the total R-value of an object composed of several layers of material is the sum of the R-values of the individual layers. Note that the R-value is the building industry term for what is in other contexts called ″thermal resistance per unit area.″ It is sometimes denoted RSI-value if the SI (metric) units are used.An R-value can be given for a material (e.g. for polyethylene foam), or for an assembly of materials (e.g. a wall or a window). In the case of materials, it is often expressed in terms of R-value per unit length (e.g. per inch of thickness). The latter can be misleading in the case of low-density building thermal insulations, for which R-values are not additive: their R-value per inch is not constant as the material gets thicker, but rather usually decreases.The units of an R-value (see below) are usually not explicitly stated, and so it is important to decide from context which units are being used: an R-value expressed in I-P (inch-pound) units is about 5.68 times larger than when expressed in SI units, so that, for example, a window that is R-2 in I-P units has an RSI of 0.35 (since 2/5.68=0.35). For R-values there is no difference between US customary units and imperial units. As far as how R-values are reported, all of the following mean the same thing: ″this is an R-2 window″; ″this is an R2 window″; ″this window has an R-value of 2″; ″this is a window with R=2″ (and similarly with RSI-values, which also include the possibility ″this window provides RSI 0.35 of resistance to heat flow″). * The more a material is intrinsically able to conduct heat, as given by its thermal conductivity, the low... |