Thermal emittance or thermal emissivity is the ratio of the radiant emittance of heat of a specific object or surface to that of a standard black body. Emissivity and emittivity are both dimensionless quantities given in the range of 0 to 1, representing the comparative/relative emittance with respect to a blackbody operating in similar conditions, but emissivity refers to a material property (of a homogeneous material), while emittivity refers to specific samples or objects.
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| - Emitancia térmica (es)
- Thermal emittance (en)
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| - La emitancia térmica o emisividad térmica es la relación entre la emisión de calor radiante de un objeto o superficie específica y la de un cuerpo negro estándar. La emisividad es una cantidad adimensional dada en el rango de 0 a 1, pero se refiere a una (de un material homogéneo), mientras que la emisividad se refiere a muestras u objetos específicos.
* Datos: Q3369825 (es)
- Thermal emittance or thermal emissivity is the ratio of the radiant emittance of heat of a specific object or surface to that of a standard black body. Emissivity and emittivity are both dimensionless quantities given in the range of 0 to 1, representing the comparative/relative emittance with respect to a blackbody operating in similar conditions, but emissivity refers to a material property (of a homogeneous material), while emittivity refers to specific samples or objects. (en)
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| - La emitancia térmica o emisividad térmica es la relación entre la emisión de calor radiante de un objeto o superficie específica y la de un cuerpo negro estándar. La emisividad es una cantidad adimensional dada en el rango de 0 a 1, pero se refiere a una (de un material homogéneo), mientras que la emisividad se refiere a muestras u objetos específicos. Para los productos de construcción, las mediciones de emisión térmica se toman para longitudes de onda en el infrarrojo. La determinación de la emisión térmica y la reflectancia solar de los materiales de construcción, especialmente los , puede ser muy útil para reducir los costos de energía de calefacción y refrigeración en los edificios. El índice de reflectancia solar (ISR) combinado se usa a menudo para determinar la capacidad general de reflejar el calor solar y liberar calor térmico. Una superficie de techo con alta reflectancia solar y alta emisión térmica reflejará el calor solar y liberará calor absorbido fácilmente. El material de alta emisión térmica irradia calor térmico de regreso a la atmósfera más fácilmente que uno con una baja emisión térmica.
* Datos: Q3369825 (es)
- Thermal emittance or thermal emissivity is the ratio of the radiant emittance of heat of a specific object or surface to that of a standard black body. Emissivity and emittivity are both dimensionless quantities given in the range of 0 to 1, representing the comparative/relative emittance with respect to a blackbody operating in similar conditions, but emissivity refers to a material property (of a homogeneous material), while emittivity refers to specific samples or objects. For building products, thermal emittance measurements are taken for wavelengths in the infrared. Determining the thermal emittance and solar reflectance of building materials, especially roofing materials, can be very useful for reducing heating and cooling energy costs in buildings. Combined index Solar Reflectance Index (SRI) is often used to determine the overall ability to reflect solar heat and release thermal heat. A roofing surface with high solar reflectance and high thermal emittance will reflect solar heat and release absorbed heat readily. High thermal emittance material radiates thermal heat back into the atmosphere more readily than one with a low thermal emittance. In common construction applications, the thermal emittance of a surface is usually higher than 0.8–0.85. High thermal emittance materials are essential to passive daytime radiative cooling, which uses surfaces high in thermal emittance and solar reflectance to lower surface temperatures by dissipating heat to outer space. It has been proposed as a solution to energy crises and global warming. (en)
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