The R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat transfer per unit area per unit time, ) through it or . An R-value is the unit thermal resistance. It is particular to each material. In practice, it is treated as a constant, regardless of the temperature difference. The R-value does not take other heat transfer modes into account.

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• The R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat transfer per unit area per unit time, ) through it or . An R-value is the unit thermal resistance. It is particular to each material. In practice, it is treated as a constant, regardless of the temperature difference. The R-value does not take other heat transfer modes into account. In use, convective and radiative heat transfer are also important factors when choosing an insulator.R is expressed as the thickness of the material divided by the thermal conductivity. The unit thermal conductance of a material is denoted as C and is the reciprocal of the unit thermal resistance. This can also be called the unit surface conductance, commonly denoted by h. The higher the number, the better the building insulation's theoretical effectiveness. R-value is the reciprocal of U-factor.
• La transmitancia térmica (U, pero denominada también como Valor-U en algunos lugares) es la medida del calor que fluye por unidad de tiempo y superficie, transferido a través de un sistema constructivo, formado por una o más capas de material, de caras plano paralelas, cuando hay un gradiente térmico de 1°C (1 K) de temperatura entre los dos ambientes que éste separa.En el Sistema Internacional se mide en unidades W/m2K ó en W/m2°C. Su valor incluye las resistencias térmicas superficiales de las caras del elemento constructivo, es decir, refleja la capacidad de trasmitir calor de un elemento constructivo en su posición real en el edificio. Cuanto menor sea el valor-U, menor será el paso de energía entre ambas caras, y por tanto mejor las capacidades aislantes del elemento constructivo. En el caso de las ventanas, depende del nivel de aislamiento de perfil y el vidrio.
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• The R-value is a measure of thermal resistance used in the building and construction industry. Under uniform conditions it is the ratio of the temperature difference across an insulator and the heat flux (heat transfer per unit area per unit time, ) through it or . An R-value is the unit thermal resistance. It is particular to each material. In practice, it is treated as a constant, regardless of the temperature difference. The R-value does not take other heat transfer modes into account.
• La transmitancia térmica (U, pero denominada también como Valor-U en algunos lugares) es la medida del calor que fluye por unidad de tiempo y superficie, transferido a través de un sistema constructivo, formado por una o más capas de material, de caras plano paralelas, cuando hay un gradiente térmico de 1°C (1 K) de temperatura entre los dos ambientes que éste separa.En el Sistema Internacional se mide en unidades W/m2K ó en W/m2°C.
rdfs:label
• Résistance thermique
• R-value (insulation)
• R-waarde
• Transmitancia térmica
• Valor R
• Сопротивление теплопередаче ограждающих конструкций
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