Abstract: The factors affected the thermal comfort of pig house include temperature, humidity, wind speed and thermal radiation. The thermal comfort of pig body is coused by these factors and the comprehensive effect of pig metabolism. The traditional temperature and humidity index can not accurately express the thermal comfort of pigs. In this paper, based on the index of predicted mean vote (PMV), the index of pig PMV was proposed by analogy. Using computational fluid dynamics (CFD), the temperature and humidity model field of pig house under the action of summer wet curtain was established, and the PMV field simulation model of pig body was calculated on this basis. The model data was compared with the data of wireless sensor network and the error fluctuation was less than 6%. Under the action of wet curtain in summer, the temperature field in the simulated pig house decreased about 4 ℃ on the whole, the wind speed showed low in the middle and high schools on both sides, and there was a certain area of air flow dead zone near the wall and the corner of the pig house. The fluctuation range of PMV index under the action of wet curtain was -0.5~+0.5, which belonged to the comfortable index range. This method could obtain the accurate field distribution of thermal comfort in the living area of pigsty, and provided  theoretical basis for the optimization of environmental control of pigsty.

Key words: piggery thermal comfort, pig PMV index, CFD, wireless sensor network

摘要： 影响猪舍热舒适性的因素包括温度、湿度、风速和热辐射，猪体的热舒适感是由这些因素以及猪体新陈代谢综合作用的结果。传统温湿度指标难以精确地表达猪体的热舒适感。在人体平均预测投票（predicted mean vote，PMV）指标的基础上用类比方法提出了猪体PMV指标。采用计算流体动力学（computational fluid dynamics，CFD）对夏季湿帘作用下的猪舍建立温湿度模型场，并在此基础上计算得到猪体PMV场仿真模型，将模型数据与无线传感器网络的数据进行对比，误差波动在6%以下。夏季湿帘作用下，模拟猪舍内部温度场在整体上降低了4 ℃左右，风速呈现出两边高中间低，靠近墙壁的地方和猪舍角落的地方呈现出一定面积的气流死区，猪体PMV指标在湿帘作用下的波动范围在-0.5~+0.5之间，属于舒适的指标范围内。该方法可以获得猪舍生活区猪体热舒适感的精确场分布情况，为猪舍环境控制的优化提供强有力的理论依据。

关键词: 猪舍热舒适性, 猪体PMV指标, CFD, 无线传感器网络