A dimensionless parameter coupling the south and north roofs on the thermal environment of Chinese solar greenhouse: Ridge position ratio

This paper clarified the mechanism of the south and north roofs on the thermal environment of the Chinese solar greenhouse (CSG), using a new parameter: ridge position ratio (RPR), which can describe the dynamic dependency relationship between the south and north roofs. A mathematical model was established by using the method of combining computational fluid dynamics (CFD) with experiments, which then was used to analyze the effect of RPR on the thermal environment of the CSG. Based on this model, we compared the temperature distributions of the greenhouse with different RPR. Furthermore, the effects of different RPR on the amount of solar energy that entered the greenhouse were studied. Finally, the effects of different RPR on heat released capacity of the greenhouse envelopes at different moments were analyzed. The results showed the decline rate of the maximum temperature of each part in different RPR intervals increased as the increase of RPR during the daytime. The occurrence time ...本研究阐明了南北屋面对中国日光温室（Chinese solar greenhouse, CSG）热环境的作用机制，引入了可表征南北屋面动态依赖关系的新参数——脊位比（ridge position ratio, RPR）。采用计算流体动力学（computational fluid dynamics, CFD）与试验相结合的方法构建了数学模型，以此分析RPR对中国日光温室热环境的影响。基于该模型，对比了不同RPR工况下温室内部的温度分布。此外，还探究了不同RPR对进入温室的太阳能总量的影响。最后，分析了不同RPR对温室围护结构在不同时刻的释热能力的作用。研究结果表明，日间不同RPR区间内温室各部位最高温度的下降速率随RPR增大而升高。其发生时间……