The skeleton curve form of solar greenhouse directly affects the front roof lighting and mechanical bearing performance. In order to study and design a reasonable skeleton curve form of solar greenhouse, based on the design characteristics and application situation of the existing skeleton, the numerical construction and expression methods of the reasonable curve of the solar greenhouse skeleton were studied. When the position of the ridge point, the lowest working height, the slope at the front roof ridge, and the slope at the foot are determined, this method can directly provide a numerical expression for the skeleton curve, and qualified skeleton curve forms can be screened out through regulatory requirements. A double parabolic skeleton curve was proposed in this study, and three cities, Beijing, Shenyang and Yinchuan, were selected to simulate the lighting performance of solar greenhouses with five skeleton curve forms, which were parabolic, elliptical, double parabolic, power function and double circle. The results showed that: 1) The maximum difference between the cumulative solar radiation on the winter solstice day under five different skeleton curve forms was 6.31%, and the double parabola as the skeleton curve form was reliable in terms of lighting performance; 2) When the current horizontal projection of the roof is 6 to 14 m and the minimum working height is 1 to 1.8 m, a double parabolic curve that meets both the regulatory requirements and the actual engineering situation can be constructed.
ChenD S, ZhengH S, ZhangJ G, QiuJ J. A comprehensive research on the meteorological environment in sun light greenhouse(Ⅲ):A comprehensive research on the total amount of direct radiation in the greenhouse with different arc lighting surface [J]. Transactions of the Chinese Society of Agricultural Engineering, 1992, 8(4):78-82 (in Chinese)
WangC D, ShiW M, PeiX W. Comparing the front roof permeated sunlight performances and the arch mechanical performances of four curvilinear roofs of solar greenhouse[J]. Journal of Northwest A&F University: Natural Science Edition, 2010, 38(8):143-150 (in Chinese)
SunZ F, WuY M, CaoY H, LiY X. A method of computer simulation of direct solar radiation within greenhouses: The third part of serial studies on simulation of light environment of farming under structure[J]. Transactions of the Chinese Society of Agricultural Engineering, 1993, 9(1): 36-42 (in Chinese)
CaoY H, SunZ F, WuY M, LiY X. Research of auxiliary designing software GRLT in light transmissivity of greenhouse:The second part of serial studies in simulation of light environment in protected cultivation[J]. Transactions of the Chinese Society of Agricultural Engineering, 1992, 8(4):69-77 (in Chinese)
LiuJ J, ZouZ R. Frame optimization of solar greenhouse without an inner post [J]. Journal of Ningxia Institute of Technology, 1996(S1): 254-257 (in Chinese)
GaoZ K, WeiL G, WangM, LiuB Y, RenS F. Studies on practical optimization of lighting performance in solar greenhouse[J]. Journal of Hebei Agricultural University, 2006, 29(1): 1-5 (in Chinese)
ZhaoY Q. Standardized design of front roof curve of solar greenhouse in Guanzhong area[J]. Agricultural Development & Equipments, 2022(1):135-138 (in Chinese)
ZhangS F, BaiW B, PanT R, WuZ M, WangY S. Study on the optimized parameters of lighting curve of front roof of solar greenhouse in the north of China[J]. Journal of Shanxi Agricultural University: Natural Science Edition, 2013, 33(4): 336-341 (in Chinese)
XuanW Y. Mathematical model establishment and analysis for greenhouse surface curve[J]. Tianjin Agricultural Sciences, 2006, 12(4): 44-46 (in Chinese)
[19]
马坤. 四种屋面曲线日光温室采光性能的试验分析[D]. 太谷: 山西农业大学, 2016
[20]
MaK. Experimental analysis of the lighting performance of several roof curve sunlight greenhouse[D]. Taigu: Shanxi Agricultural University, 2016 (in Chinese)
ZhouC J. Frame optimization of solar greenhouse with an inner post[J]. Transactions of the Chinese Society of Agricultural Engineering, 1994(1): 157-160 (in Chinese)
ChengJ Y, ZhaoS M, MaC W, XiaN, WangP Z. Designing and analysis of solar greenhouse roof curve under the constraint of the basic condition for shape[J]. Xinjiang Agricultural Sciences, 2014, 51(6):981-989 (in Chinese)
ZhouC J, SunS, WuD R. Optimal curve shape of energy-saving sunlight greenhouse with respect to light transmissivity[J]. Transactions of the Chinese Society of Agricultural Engineering, 1993, 9(4): 58-61 (in Chinese)
TongG H. Optimization and structural analysis of front roof of solar greenhouse[J]. Transactions of the Chinese Society of Agricultural Engineering, 1999, 15(2): 240-241 (in Chinese)
GB/T 19165—2003 Structure and properties requirement for sunlight greenhouse and plastic tunnel. Beijing: Standards Press of China, 2004 (in Chinese)
[33]
NY/T 3223—2018日光温室设计规范[S]. 北京: 中国农业出版社, 2018
[34]
NY/T 3223—2018 Code for design of Chinese solar greenhouse[S]. Beijing: China Agriculture Press, 2018 (in Chinese)
[35]
陈超. 现代日光温室建筑热工设计理论与方法[M]. 北京:科学出版社, 2017: 63-64
[36]
ChenC. Theory and Method of Thermal Design of Modern Solar Greenhouse[M]. Beijing: Science Press, 2017: 63-64 (in Chinese)
[37]
彦启森, 赵庆珠. 建筑热过程[M]. 北京: 中国建筑工业出版社, 1986: 9-16
[38]
YanQ S, ZhaoQ Z. Building Thermal Process[M]. Beijing: China Architecture & Building Press, 1986: 9-16 (in Chinese)
[39]
ChenJ T, MaY W, PangZ Z. A mathematical model of global solar radiation to select the optimal shape and orientation of the greenhouses in Southern China[J]. Solar Energy, 2020, 205: 380-389
XuH J, CaoY F, LiY R, GaoJ, JiangW J, ZouZ R. Establishment and application of solar radiation model in solar greenhouse[J]. Transactions of the Chinese Society of Agricultural Engineering, 2019, 35(7): 160-169 (in Chinese)
[42]
HuangL, DengL H, LiA G, GaoR, ZhangL H, LeiW J. Analytical model for solar radiation transmitting the curved transparent surface of solar greenhouse[J]. Journal of Building Engineering, 2020, 32: 101785