Abstract
A computer model was used to investigate the effects of geometric changes in greenhouse cross section on transmissivity. The effects of changing greenhouse wall height, roof height and roof configuration were studied for infinitely long houses and houses with different numbers of spans and types of cladding. Standard diffuse overcast and direct beam irradiances over the winter period only were considered. Results showed that under diffuse conditions, variations in irradiance for low wall heights are produced across multispan houses, and double glazing lowers the transmissivity by about 5%, which is less than expected from laboratory measurements. Under average light, large multispan houses with double glazing and a vertical south-facing roof provide comparable light transmissivity to conventional symmetric multispancs, and therefore offer significant reductions in operating costs. For houses with one or two spans, transmissivities can exceed 100%, and double glazing can enhance rather than reduce transmissivities.
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