Effects of Thermal Insulation Cover Methods on Internal Temperature of Chinese Solar Greenhouse

doi:10.6048/j.issn.1001-4330.2023.03.014

Xinjiang Agricultural Sciences ›› 2023, Vol. 60 ›› Issue (3): 633-642.DOI: 10.6048/j.issn.1001-4330.2023.03.014

• Plant Protection·Facility Agriculture·Agricultural Product Processing Engineering·Microbes • Previous Articles Next Articles

Effects of Thermal Insulation Cover Methods on Internal Temperature of Chinese Solar Greenhouse

LIU Kai¹(), WU Xiao¹, SANG Siyu¹, XU Hongjun¹^,²(), GAO Jie¹()

1. College of Horticulture, Xinjiang Agricultural University, Urumqi 830052, China
2. Post-doctoral Mobile Station in Horticulture of Xinjiang Agricultural University, Urumqi 830052, China

Received:2022-07-25 Online:2023-03-20 Published:2023-04-18
Correspondence author: GAO Jie (1963-), male, professor, PhD/Master's supervisor, research interests is facility vegetable cultivation and physiology, (E-mail)13999803260@163.com;
XU Hongjun (1987-), male, PhD, Associate professor, Master's supervisor, research interests is facility horticulture engineering, (E-mail)xuhongjun01@163.com
Supported by:
R & D Project of University Scientific Research Program of Xinjiang Uygur Autonomous Region(XJEDU2019Y017);Natural Science Foundation of Xinjiang Uygur Autonomous Region(2021D01A83)

保温被揭盖方式对日光温室内部温度的影响

刘凯¹(), 吴晓¹, 桑思语¹, 许红军¹^,²(), 高杰¹()

1.新疆农业大学园艺学院,乌鲁木齐 830052
2.新疆农业大学园艺学博士后流动站,乌鲁木齐 830052

通讯作者: 高杰(1963-),男,天津人,教授,博士,硕士生/博士生导师,研究方向为设施蔬菜栽培与生理,(E-mail)13999803260@163.com;
许红军(1987-),男,山东济南人,副教授,硕士生导师,研究方向为设施园艺工程(E-mail)xuhongjun01@163.com
作者简介:刘凯(1996-),男,河南固始人,硕士研究生,研究方向为设施园艺工程,(E-mail)liukai07297@163.com
基金资助:
新疆维吾尔自治区高校科研计划(XJEDU2019Y017);新疆维吾尔自治区自然科学基金(2021D01A83)

Abstract

Abstract:

【Objective】 Effects of thermal insulation cover methods on internal temperature of Chinese solar greenhouse.This project established a model of the precise uncovering position of the insulation based on the demand of light at different locations inside the greenhouse.【Method】 Proposes a new method of uncovering and covering the insulation on a time-by-time basis.At the same time, a computational fluid dynamics (CFD) transient model was used to analyze the change of air temperature inside the greenhouse under different uncovering methods in the Major Cold and spring equinox.【Result】 In this project, the CFD model of Chinese solar greenhouse was established according to the greenhouse specification 1∶1, and the coefficient of determination of the established model was between 0.91-0.92.Two Solar Terms were selected for analysis, namely the cold and the equinox.When the light completely irradiated the wall, the time-by-time uncovering increases the internal temperature of the greenhouse by 0.03℃ and 2.49℃, respectively compared with the traditional one-time uncovering and covering; when the light completely irradiated the ground, the time-by-time uncovering and covering increases the temperature by 0.55℃ and 0.9℃, respectively compared with the traditional one-time uncovering and covering; when the light completely irradiated the crop layer, the time-by-time uncovering and covering increased the temperature by 0.53℃ and 0.62℃, respectively compared with the traditional one-time uncovering.【Conclusion】 The increase in temperature of time by time uncovering and covering on the more severe cold days during the Major Cold period was not obvious, the maximum increase in the average temperature of the whole 0.56℃; around the vernal equinox time by time uncovering and covering way all day average temperature can be increased by a maximum of 2.49℃.In the cold season, the uncovering and covering methods have little effect on the temperature, and the opening angle of the insulation can be increased to obtain more solar radiation.In the spring equinox, the opening angle can be reduced to increase the temperature inside the greenhouse.

Key words: solar greenhouse; time-by-time uncovering and covering; computational fluid dynamics; precise control; model

摘要：

【目的】研究保温被揭盖方式对日光温室内部温度的影响,基于温室内部不同位置光照的需求建立保温被精准揭盖位置模型,提出一种逐时揭盖保温被的新方法。【方法】采用计算流体动力学(CFD)瞬态模型分析不同的揭盖方式下大寒、春分节气温室内部空气温度变化。【结果】按照温室规格1∶1建立日光温室CFD模型,所建立模型决定系数在0.91~0.92。选取大寒、春分2个节气分析,在光照完全照射墙体时逐时揭盖分别比传统一次性揭盖温室内部温度提高0.03和2.49℃;在光照完全照射地面时,逐时揭盖分别传统一次性揭盖温度提高0.55和0.9℃;在光照完全照射作物层时,逐时揭盖分别传统一次性揭盖温度提高0.53和0.62℃。【结论】逐时揭盖对较为严寒的大寒日前后提高温度不明显,全体平均气温最大提高了0.56℃;在春分日逐时揭盖方式全天平均温度最大可提高2.49℃。寒冷季节下,揭盖方式对温度的影响不大,可增大保温被揭起角获取更多的光照,在春分节气可减小揭起角以增加温室内部的温度。

关键词: 日光温室, 逐时揭盖, 计算流体动力学, 精准控制, 模型

CLC Number:

S625

LIU Kai, WU Xiao, SANG Siyu, XU Hongjun, GAO Jie. Effects of Thermal Insulation Cover Methods on Internal Temperature of Chinese Solar Greenhouse[J]. Xinjiang Agricultural Sciences, 2023, 60(3): 633-642.

刘凯, 吴晓, 桑思语, 许红军, 高杰. 保温被揭盖方式对日光温室内部温度的影响[J]. 新疆农业科学, 2023, 60(3): 633-642.

Figures/Tables 14

Fig.1 Diagram of greenhouse structure

Fig.2 Correspondence between a point in space and a point on the roof

Fig.3 Diagram of heat preservation quilts cover uncovering with time

Fig.4 Model and grid partition of solar greenhouse

Fig.5 CFD simulation boundary conditions

Tab.1 Thermal property parameters of greenhouse enclosure from materials

材料 Materials	密度 Density (kg/m³)	比热 Specific heat (J/(kg·℃))	导热系数 Thermal conductivity (W/(m·℃))
砖墙 Brick masonry	1 800	1 050	0.81
水泥砂浆 Cement mortar	1 700	1 050	0.78
聚苯乙烯板 Styrofoam	25	1 380	0.035
湿空气Wet air	-	1 004	0.025
土壤Soil	1 200	1 010	0.6

Tab.2 CFD model validation data for each point

位点 Test Points	平均偏差 Mean bias error (℃)	平均绝对误差 Mean absolute error (℃)	均方根误差 Root mean square error (℃)	R²
a(1,1.5)	-0.14	3.18	3.93	0.91
b(4,1.5)	-0.18	2.50	3.30	0.92
c(7,1)	-0.92	2.36	3.41	0.92

Fig.6 CFD model validation of daylight greenhouse

Fig. 7 Air temperature inside the greenhouse around the day of the Major Cold

Fig. 8 Comparison of air temperature inside the greenhouse around the day of the vernal equinox

Fig.9 Comparison of air temperature inside the greenhouse around the day of the Major Cold

Fig.10 Comparison of air temperature inside the greenhousearound the day of the vernal equinox

Fig.11 Comparison of air temperature inside the greenhouse around the day of the Major Cold

Fig.12 Comparison of air temperature inside the greenhouse around the day of the vernal equinox

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Effects of Thermal Insulation Cover Methods on Internal Temperature of Chinese Solar Greenhouse

保温被揭盖方式对日光温室内部温度的影响

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