Radiant heat-flux vector

In this equation A, and A2 are the areas of the appropriate surfaces 1 and 2. Angles 0, and 02 are the angles defined by the shortest distance r between the surfaces and the appropriate normal vector to each surface. There are many different ways of solving the view factor equation. The solution depends on the shape and orientation of the surfaces. Comprehensive listings of view factors for commonly encountered configurations can be found in References 2 and 18 through 20. The application of view factors can be illustrated with a simple example. Suppose we have surface 1 with temperature 7 , and emissivity e and a black surface 2 (e = 1) with temperature T2 then the total radiant heat flux from surface 1 to surface 2 is... 

Samples used for the tests used samples werelOOxlOO mm and thickness 5.5-6.5 mm, placed in an aluminum crucible vector perpendicular to the radiant heat flux of 50 kW/m. Cone calorimeter flammability test was performed in accordance with ISO 5660. 

Some specific studies on the measurement of heat losses and indoor temperatures in buildings deserve attention. In his review of the relative importance of thermal comfort in buildings, McIntyre considered that the mean radiant temperature was the most important parameter, followed closely by the "radiation vector," which is defined as the net radiant flux density vector at a given point and measures the asymmetry of the thermal radiation field in a room (97). Benzinger et al. characterized the mean radiant temperature, and asymmetric radiation fields, using a scanning plane radiometer, which maps the plane radiant temperature in a given space indoors (98). 

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