The estimation of diffuse irradiance that impinges on a window or photovoltaic panel is of major importance for the … determination of their performance. The present paper introduces the concept of angular shading factors (ASF) for the calculation of … surfaces can be modeled as well. After that, the calculation of diffuse irradiance can be performed in a dynamic way, by taking …

CIE call, solar horizontal and vertical illuminance and irradiance measurements have been carried out for four sites, i …

Daylighting is one of the basic components of passive solar building design and its estimation is essential. In India … there are a few available data of measured illuminance as in many regions of the world. The Indian climate is generally … daylighting in buildings. Therefore, an analytical model that would encompass the weather conditions of Indore was selected …

are in daylighting design, both for visual and thermal comfort, task illuminance and energy-conscious design of buildings … daylight became urgent when the importance of daylighting in buildings was rediscovered. The hourly daylight availability has … and cloud cover data. This paper presents the techniques involved in producing exterior illuminance data. These data were …

Illuminance measurement do not make up a part of routine measurements in meteorological stations in Brazil, therefore …, they are very rare. This information is important for evaluating the potential contribution of natural illumination in … illumination and refrigeration systems. …