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Salmerón, José Manuel et al. Calculation of the solar radiation components over building exterior surfaces in an urban environment. In: CONFERENCE ON PASSIVE AND LOW ENERGY ARCHITECTURE, 20., 2003, Santiago do Chile. Anais... Santiago do Chile, 2003.
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Abstract

Solar radiation is the most important contribution to the surface and volumetric energy balance during the daytime. Particularly, solar radiation is the main responsible for heat gains in a building, especially in residential buildings, where internal gains are very low. Thus, it is necessary to limit those gains from solar radiation by using elements which block that solar radiation over the building exterior surfaces. In this way, we get a better internal comfort and a reduction of cooling requirements. If we consider the relative importance of solar radiation in comparison with the rest of heat flows, a good calculation method is required in order to determine each component: direct, diffuse and reflected. The proposed method considers the whole process, from how to characterize surfaces and volumes, to the calculation of all the solar radiation components over an external surface. The main reason we choose this method instead of a direct one is because we need to evaluate urban surroundings influence on a building, so there are many surfaces which affect the solar radiation impinging over the building envelope. In this situation it is very difficult to solve the problem through the radiosity method, which would produce the exact result, only if we were able to calculate the view factors among all the surfaces. Thus, we calculate an approximate result with quite less computational efforts. Furthermore, the accuracy of this result can be increased easily, although, it would be necessary more computation time. In conclusion, we demonstrate that it is possible to assess the incident solar radiation components on a surface with an abs olutely innovative method which consists on backward ray tracing.
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