A single span 8 m of the sawtooth type multi-span greenhouse (STMG) in Changde city is taken as the research object based on the requirements of production and engineering construction. Ladybug Tools
a new type of building environment simulation plug-in
was used to investigate the influence of the variation of orientation and ridge position on the light environment in the greenhouse
and the optimal ridge position of the STMG with east-west and south-north was obtained. The results show that the lighting performance of the STMG is the best when the ridge-position ratio is 5.6∶2.4. The daytime illuminance of the STMG in the north-south greenhouse is higher than that in the east-west greenhouse. Under the optimal ridge-position ratio
the difference of illuminance is small
but the difference of solar irradiance is large. The solar irradiance inside the east-west greenhouse is 7.47 W/m higher than that inside the south-north greenhouse
which means that the east-west greenhouse has a stronger ability to acquire solar energy. This paper realizes the simulation of the light-environment of horticultural facilities based on Ladybug Tools
and obtains the optimal ridge-position ratio of the STMG.
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