低屋面横向通风牛舍温湿度场CFD模拟

在中国华东地区最炎热的月份，舍外高温高湿的气候条件，降低了低屋面横向通风（low profile cross ventilated， LPCV）牛舍的环境调控效果。为了研究LPCV牛舍温湿度场的分布规律，该文在现场实测的基础上，采用计算流体动力学CFD（computational fluid dynamics）方法，对LPCV牛舍的温度和相对湿度参数进行了三维数值模拟。现场实测的结果表明，舍外空气温度为36.2℃，相对湿度为55.5%的条件下，舍外空气流经湿帘后的降温幅度为7.7℃，湿帘出口处的相对湿度为99.9%；模拟结果表明，舍内温湿度场受气流场的影响，分布不均匀，风速高的区域温度相对较低...

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Bibliographic Details
Published in农业工程学报 Vol. 31; no. 9; pp. 209 - 214
Main Author 邓书辉 施正香 李保明
Format Journal Article
LanguageChinese
Published 中国农业大学水利与土木工程学院，农业部设施农业工程重点实验室，北京 100083 2015
黑龙江八一农垦大学工程学院，大庆 163319%中国农业大学水利与土木工程学院，农业部设施农业工程重点实验室，北京 100083
Subjects
低屋面横向通风
奶牛舍
数值模拟
温度
湿度控制
计算流体动力学
温度
dairy cattle barns
humidity control
低屋面横向通风
computational fluid dynamics
计算流体动力学
奶牛舍
temperature
low profile cross ventilated
湿度控制
数值模拟
numerical simulation
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Summary:在中国华东地区最炎热的月份，舍外高温高湿的气候条件，降低了低屋面横向通风（low profile cross ventilated， LPCV）牛舍的环境调控效果。为了研究LPCV牛舍温湿度场的分布规律，该文在现场实测的基础上，采用计算流体动力学CFD（computational fluid dynamics）方法，对LPCV牛舍的温度和相对湿度参数进行了三维数值模拟。现场实测的结果表明，舍外空气温度为36.2℃，相对湿度为55.5%的条件下，舍外空气流经湿帘后的降温幅度为7.7℃，湿帘出口处的相对湿度为99.9%；模拟结果表明，舍内温湿度场受气流场的影响，分布不均匀，风速高的区域温度相对较低，舍内相对湿度与温度呈现强烈的耦合关系。随着空气的流动，沿气流方向平均每米长度温度升高0.014℃、相对湿度下降0.04%， THI增加0.025。模拟值与实测值的对比表明，9个测点温度和相对湿度的测试值与模拟值之间相对误差的平均值分别为0.89%和0.59%，理论计算和数值模拟得到的奶牛显热散热量的相对误差为14.5%，说明现场实测与数值模拟有较好的吻合度。该研究可为中国LPCV牛舍结构优化设计和环境调控提供参考。
Bibliography:11-2047/S
With the ever increasing scale and intensivism in pasture in China, low profile cross ventilated （LPCV） dairy cattle barn, as a main building style in cattle house, is increasingly applied. The most obvious benefit of LPCV building is the ability to control the cow’s environment during all seasons of the year. It increases the percentage of time cows are in the thermal neutral zone, which allows both milk production and feed efficiency to be increased. However, during the hottest period in eastern China, the hot and humid climate, reduces the control effectiveness inside the building. In order to understand temperature and humidity distribution inside, the field experiment, which measured the parameters including environment temperature, humidity and surface temperature of dairy cattle, was conducted. The experimental dairy houses were located in the east part of China, with the demotions of length 376.6 m×width 90.4 m, and a slop roof of 1/12.5 pitch. Measured results showed that in the LPCV cattle
ISSN:1002-6819
DOI:10.11975/j.issn.1002-6819.2015.09.032