060-沈阳地区LPCV牛舍夏季湿帘风机系统运行模拟分析.pdfVIP

沈阳地区LPCV 牛舍夏季湿帘风机系统运行 模拟分析 吕洁，吕慧洁，孙成才，王旭斌(沈阳工业大学 建筑与土木工程学院) 摘 要：为研究沈阳地区 LPCV 牛舍夏季舍内环境变化规律，为沈阳地区 LPCV 牛舍提供 合理的湿帘风机运行方案，以沈阳地区某六排低屋面横向通风牛舍为研究对象，采用计算流 体动力学（computational fluid dynamics，CFD）方法，分别在沈阳夏季设计工况和极端 最热工况下对舍内环境进行三维数值模拟，分析两种工况条件下舍内的温度和速度分布规 律，确定两种工况下的湿帘风机系统运行方案。模拟结果表明，沈阳地区夏季设计工况条件 下，风机全开，湿帘喷淋水采用常温水 20℃时，舍内环境可满足舍内奶牛舒适性要求；在 极端最热工况条件下，风机全开，喷淋水水温需降低至 16℃时，舍内环境可满足舍内奶牛 舒适性要求。两种工况条件下，1.2m 高度截面上沿水平方向最大温度梯度不超过 0.068℃/m， 舍内平均速度不超过 1.92m/s，气流不均匀系数最大为 59.86%。 关键词：低屋面横向通风牛舍；计算流体动力学；数值模拟；湿帘风机系统；运行方案 Abstract: In order to study the law of indoor environment change of Shenyang LPCV dairy cattle barn in summer and provide the suitable fan-pad cooling system operating scheme. The object of study is a certain 6-row Shenyang low profile cross ventilated dairy cattle barn. Three-dimension computational fluid dynamics (CFD) method was carried out to simulate thermal condition inside the cattle building under design condition and extreme condition of Shenyang in summer, to analyze temperature and velocity distribution law inside the cattle building under both working conditions and get the operating scheme of fan-pad cooling system. Simulated results showed that while all fans were turned on and 20℃ room temperature water was used for wet pad spray water under the design condition, the indoor condition could satisfied the comfort requirements for cows. While all fans were turned on and wet pad spray water temperature drops to 16℃ under the extreme condition, the indoor condition could satisfied the comfort requirements for cows. With the air movement, temperature increased not exceeding 0.014℃ per meter in width dimension of Z=1.2m and indoor mean velocity was not more than 1.92m/s, air non-uniformity coefficient was not more than 49.35% under two working conditions. Key words: low profile cross ventilated; computational fluid dynamics; numerical simulation; fan-pad system; operating scheme 低屋面横向通风（low