Abstract
The energy saving sunlight greenhouse is the most successful and unique facility of protected horticulture in China. Detailed experiment was introduced to analyze the basic mechanism forming thermal environment in the sunlight greenhouse. Solar radiation transmissivity of roof film was about 60%. Temperature differences between inside and outside-air were over 10°C during night without supplemental heating. Heat transfer rate from each wall and floor-soil to inside-air were about 68% from soil, 23% from north-wall and each 3 to 6% from east and west-wall of the total heat, respectively. During night, north-wall emitted about 30% of heat preserved by solar incident during the daytime. More improvement for the thermal property of walls is necessary to modify the thermal environment in crop production.
