猪舍热舒适性评价及夏季湿帘作用下的CFD模拟

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 flu...

Thermal Comfort Evaluation of Pigsty and CFD Simulation of Wet Curtain in Summer

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.