Abstract
Some experimental results of solar radiation transmissivity into a Chinese-style lean-to greenhouse were described. The greenhouse is east-west oriented and its north wall, north roof and east- and west-gable walls were made of opaque materials.A scale-model greenhouse with the floor area of 20cm (width)×160cm (length) was constructed and 16 solar cells (each detecting area is 11mm×17.5mm) were set on the floor at its central part. Experimental observations were conducted from December 1992 to June 1993 in Tokyo (35°41′N) at an interval of about 45 days on fine days as well as on overcast days. The results on fine days showed that in winter and spring daily transmissivity distributions on the floor were quite uniform except for some low radiation points due to shades of the purlines. In summer time, on the other hand, daily transmissivity at the north part of the greenhouse showed remarkably lower values compared to those of the rest part. Transmissivities during 9:00-15:00 were higher than those during the early or late hours of the day in every season. The results on an overcast day showed that diffuse radiation transmissivity on the floor was quite nonuniform because of the shade effect of the north wall and north roof to the diffuse radiation.
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