Abstract
One of the principles of passive solar design for housing is the use of larger windows on south elevations and reduced openings on the north. For smaller windows, the frame forms a significant proportion of the whole. It can be demonstrated that relationship of the frame to the structural opening and the reflectivity of the reveals influence the luminous efficiency of a window in excess of the customary correction factors. In addition, the size of trickle vents is to increase with the recent amendment to the Building Regulations which may further increase the extent of window frames. This paper is concerned with the implications that the design of window frames, their construction within walls and the integration of trickle vents have for a broad definition of quality of daylighting in speculative housing.
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