Sol-air temperature (Tsol-air) is a variable used to calculate cooling load of a building and determine the total heat gain through exterior surfaces. It is an improvement over: Where:
* = rate of heat transfer [W]
* = heat transfer surface area [m2]
* = heat transfer coefficient for radiation (long wave) and convection [W/m2K]
* = outdoor surroundings' temperature [°C]
* = outside surface temperature [°C] Where: The product just found can now be used to calculate the amount of heat transfer per unit area, as below: Where:
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| - Temperatura sol-aire (es)
- Sol-air temperature (en)
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| - Temperatura Sol-aire (Tsol-aire) es una variable que se utiliza para calcular la carga de refrigeración de un edificio y determinar la ganancia total de calor a través de las superficies exteriores. Es representada por la siguiente expresión: El producto encontrado se puede utilizar para calcular la cantidad de transferencia de calor por unidad de área, como a continuación: Una ecuación equivalente y más útil para la pérdida de calor neto a través de toda la construcción es: Por expansión de la ecuación por sustitución se deriva la siguiente ecuación de transferencia de calor: (es)
- Sol-air temperature (Tsol-air) is a variable used to calculate cooling load of a building and determine the total heat gain through exterior surfaces. It is an improvement over: Where:
* = rate of heat transfer [W]
* = heat transfer surface area [m2]
* = heat transfer coefficient for radiation (long wave) and convection [W/m2K]
* = outdoor surroundings' temperature [°C]
* = outside surface temperature [°C] Where: The product just found can now be used to calculate the amount of heat transfer per unit area, as below: Where: (en)
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| - Temperatura Sol-aire (Tsol-aire) es una variable que se utiliza para calcular la carga de refrigeración de un edificio y determinar la ganancia total de calor a través de las superficies exteriores. Es representada por la siguiente expresión: La ecuación anterior solo tiene en cuenta las diferencias de temperatura y hace caso omiso de dos parámetros importantes, que es 1) flujo de radiación solar, y 2) el intercambio de infrarrojos del cielo. El concepto de Tsol-airese introducen así para permitir que estos parámetros que deben incluirse dentro de un cálculo mejorado. Entonces la expresión sería: El producto encontrado se puede utilizar para calcular la cantidad de transferencia de calor por unidad de área, como a continuación: Una ecuación equivalente y más útil para la pérdida de calor neto a través de toda la construcción es: Por expansión de la ecuación por sustitución se deriva la siguiente ecuación de transferencia de calor: La ecuación anterior se utiliza para las fachadas opacas en, y hace que el cálculo intermedio de innecesario. La ventaja principal de este último enfoque es que evita la necesidad de un nodo de diferente temperatura al aire libre para cada fachada. De este modo, el esquema de solución se mantiene simple, y las condiciones de radiación solar y el cielo de todas las fachadas se pueden agregar y se distribuye a los nodos de la temperatura interna como plusvalías o minusvalías. (es)
- Sol-air temperature (Tsol-air) is a variable used to calculate cooling load of a building and determine the total heat gain through exterior surfaces. It is an improvement over: Where:
* = rate of heat transfer [W]
* = heat transfer surface area [m2]
* = heat transfer coefficient for radiation (long wave) and convection [W/m2K]
* = outdoor surroundings' temperature [°C]
* = outside surface temperature [°C] The above equation only takes into account the temperature differences and ignores two important parameters, being 1) solar radiative flux; and 2) infrared exchanges from the sky. The concept of Tsol-air was thus introduced to enable these parameters to be included within an improved calculation. The following formula results: Where:
* = solar radiation absorptivity (surface solar absorptance or the inverse of the solar reflectance of a material) [-]
* = global solar irradiance (i.e. total solar radiation incident on the surface) [W/m2]
* = extra infrared radiation due to difference between the external air temperature and the apparent sky temperature. This can be written as [W/m2] The product just found can now be used to calculate the amount of heat transfer per unit area, as below: An equivalent, and more useful equation for the net heat loss across the whole construction is: Where:
* = construction U-value, according to ISO 6946 [W/m2K].
* = indoor temperature [°C]
* = difference between outside dry-bulb air temperature and sky mean radiant temperature [°C]
* = Form factor between the element and the sky [-]
* = 1 for an unshaded horizontal roof
* = 0,5 for an unshaded vertical wall
* = external radiative heat transfer coefficient [W/m2K] By expanding the above equation through substituting the following heat loss equation is derived: The above equation is used for opaque facades in, and renders intermediate calculation of unnecessary. The main advantage of this latter approach is that it avoids the need for a different outdoor temperature node for each facade. Thus, the solution scheme is kept simple, and the solar and sky radiation terms from all facades can be aggregated and distributed to internal temperature nodes as gains/losses. (en)
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