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By Rafael Serra Florensa

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Con estas especificidades, las definiciones y relaciones entre las unidades ya citadas también serán validas para la luz, con las equivalencias siguientes: Flujo radiante, M (W) Flujo luminoso, M (lumen, lm) Mlumen = Mwatt V8 680 lm/W Intensidad, I (W/str) Intensidad de luz, I (candela, cd = lm/str). Radiancia, L (W/str m²) Luminancia, L (cd/m²). Irradiación, E (W/m²) Iluminancia, E (lux, lx = lm/m²). El color de la luz es consecuencia del reparto de energía en las distintas longitudes de onda del espectro.

La superficie aparente ( Sap ) es la proyección sobre un plano perpendicular a la dirección que consideramos. Sap = S cos 1). Intensidad de irradiación, E = M / S. Flujo radiante que llega a una superficie determinada. unidad: watt por metro cuadrado (W/m²). Relaciones fundamentales entre unidades radiantes Como consecuencia de las unidades definidas antes y a partir de las leyes generales de la radiación, se deducen una serie de relaciones que pueden ser utilizadas en la evaluación de los fenómenos radiantes.

Los autores, 2000; © Edicions UPC, 2000. 3 Aire El movimiento del aire puede generar la renovación o el cambio del aire interior por aire exterior o de otro local. En realidad este proceso siempre se genera por movimientos convectivos, por diferencia de temperaturas entre dos aires o bien por la presión de un viento exterior, que también será causado por movimientos convectivos pero a una escala mayor. En todos estos casos, las velocidades pueden variar desde unos cm por segundo (convecciones térmicas interiores) hasta a unos cuantos m por segundo (vientos).

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