基于CFD的不同保温供暖工况下日光温室环境模拟研究  

Environmental Simulation of Greenhouse under Different Heating Conditions Based on CFD

作　　者：刘联胜[1] 孟阔 王冬计 张晓宇[1] 刘华民 刘东红 LIU Lian-sheng;MENG Kuo;WANG Dong-ji;ZHANG Xiao-yu;LIU Hua-min;LIU Dong-hong(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China;School of Energy and Security Engineering,Tianjin Urban Construction University,Tianjin 300384,China;Tianjin Jinruntian Solar Technology Co.,Ltd.,Tianjin 300380,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401 [2]天津城建大学能源与安全工程学院,天津300384 [3]天津市金润天太阳能科技有限公司,天津300380

出　　处：《沈阳农业大学学报》2022年第6期709-716,共8页Journal of Shenyang Agricultural University

基　　金：天津市科技计划项目(19ZXBTSN00220)。

摘　　要：为提高日光温室冬季供暖期间的空气温湿度和空气流场均匀性,采用CFD构建了不同保温供暖工况下的日光温室环境模型,模拟分析了散热末端布置位置、室内顶部保温薄膜、供水温度等对室内空气温湿度分布特性和空气流动特性的影响规律。结果表明:夜间供暖过程中,散热器、高温墙体及土壤加热的共同作用使温室内部空气迅速升温,1h后可达到16℃。热浮力作用会导致温室内部空气温度分布呈现上热下冷趋势,在温室顶部形成了明显的局部高温区,这将在一定程度上增大顶棚散热量和供暖热负荷。在室内顶部敷设保温薄膜和将散热器安装在温室中部时,维持地埋管散热量不变,可进一步降低散热器供水温度,减小供暖热负荷,散热器散热量可降低35.59%,室内空气温度标准差降低7.21%,空气温度均匀性大大改善。室内顶部保温薄膜的存在会使空气温湿度同时增加,但作物生长区的相对湿度仍可维持在80%以下。散热末端布置位置、室内顶部保温薄膜、供水温度等对室内空气流动过程具有一定的影响,但各个工况下的近地面空气流速皆小于0.2m·s^(-1),对植株生长的负面影响很小。研究成果为日光温室供暖过程组织提供了基础技术指导。In order to increase temperature,humidity and uniformity of air flow in greenhouse during heating in winter,the CFD simulation was carried out for different heating conditions.The radiator location,insulation film and temperature of water supply were selected as the factors,the distribution characteristics of indoor air temperature and humidity were analyzed,and the air flow characteristics was also studied.The results showed that,when the greenhouse indoor air was heated with the radiator,the heat storage wall and the buried heat pipe in night,the air temperature could rises to 16℃within one hour.But the air temperature distribution was not uniform,it gradually increases from the bottom to the top of the greenhouse,and a high temperature zone was formed in the top of greenhouse,which increased the heat dissipation and heating load.When the greenhouse was covered with insulation film on the top and the radiator was placed in the middle of greenhouse,the temperature of water supply could be significantly reduced and the heating load could be decreased by 35.59%.In addition,the standard deviation of indoor air temperature was reduced by 7.21%,the uniformity of indoor air temperature was improved.Although the insulation film increased the air humidity,the humidity in plant growth area could still be maintained below 80%.The radiator location,insulation film and temperature of water supply affected the air flow in greenhouse.However,the air velocity was less than 0.2m·s^(-1)near the ground,which had little negative effect for plant growth.These results could provide guidance for greenhouse heating in winter.

关 键 词：日光温室 数值模拟 散热设备 温度分布 湿度分布 

分 类 号：S625.5[农业科学—园艺学]