Authors

Abstract

In order to improve the effective sunshine time, heat storage capacity and temperature distribution uniformity of traditional arch shed under low temperature, this paper designed a large-span arch shed which has larger sunny side span and east-west orientation. According to the numerical and measured data, it is concluded that the heat storage capacity and temperature distribution of asymmetrical arch shed are better than those of symmetrical arch shed within a certain range of the ratio between sunny and shaded side. After that, ten different asymmetric arch sheds were designed. It is concluded that the structure of 11+9 m along north-south direction has the best heat storage capacity. Besides that, the analysis of outside wind speed and opening size of top vent were carried out. It is found that the outside wind and top vent can effectively promote convection and exchange of the air, and then achieve the purpose of reducing the temperature. At the end of this paper, in order to identify the relationship of temperature with structure of arch shed, outside wind speed, and opening size of top vent, a mathematical model was built based on response surface methodology, which would provide theoretical guidance for design of arch sheds.

Abstract in Chinese

为提升传统拱棚低温环境下的有效日照时间、蓄热能力和温度分布均匀性，该文设计了一种东西走向的非对称大跨度拱棚。由数值计算和实测数据可以得出，向阳面和背阴面的跨度比在一定范围内时，非对称拱棚的蓄热能力和温度分布均匀性要优于对称拱棚。在此基础上，设计了10种不同的非对称拱棚，结果表明沿南北方向的11+9 m拱棚的蓄热能力最优。此外，对外界风速和顶通风口开度进行分析，研究发现外界风速和顶通风口能够能有效促进棚内空气对流和交换，进而降低棚内温度。最后，为了确定温度与拱棚结构、外界风速和顶部通风口开度之间的关系，基于响应曲面法建立了数值模型，为拱棚设计提供了理论指导。