Abstract
This chapter discusses the reduction of cooling load. The cost of cooling a building by the use of refrigeration is usually much greater, in both capital and running cost, than the cost of heating. As the solar heat-gain is a major component of the cooling load, a number of methods of reducing this source of heat gain have been developed. Solar shading by various methods is discussed in the chapter. If the direct solar radiation can be excluded by shading the window, the largest part of the solar gain is obscured. The simplest form of window shading, which may not be intentional shading, is the recess. In equatorial regions, where the solar altitude is higher, the use of a brise-soleil is effective. Another method is to arrange the windows so that the angle of incidence on the glazing is different from that on the rest of the elevation. The direct solar radiation may also be excluded by devices such as Venetian, canopy or roller blinds, which can be positioned to cut off the direct radiation.
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