基于LabVIEW和温湿指数的奶牛场自动降温系统
An automatic cooling system based on LabVIEW and THI for dairy farm

为改善在夏季高温时奶牛场的自动降温状况，设计了一种实用且有效的自动降温系统，采用LabVIEW设计基于MODBUS协议的上位机软件，运用MODBUS模拟量采集模块采集温湿度变送器的信息，利用温湿指数（temperature and humidity index，THI）控制喷淋器的开启和关闭，实现奶牛场的自动降温。测试结果表明: 设计的自动降温系统降温效果良好， 实行喷淋降温的试验组奶牛呼吸频率与对照组相比， 最高降低18次/min， 最低降低1次/min。
In the summer, high temperature is a key factors of affecting milk yield,and spray cooling is the most effective way to decrease cows body temperature and reduce their heat stress response. This study designed a practical and effective automatic cooling system, In this system,a PC software which is based on the MODBUS protocol was designed by LabVIEW, the sensor information was collected by the MODBUS analog quantity acquisition module, the opening and closing time sprinkler are controlled by the temperature and humidity indexes (THI), which implement the automatic cooling of dairy farm. The test results show that the system has good cooling effect. Compared with the control group respiratory rate of the test group with sprinkler cooling drops maximum of 18 beats per min,and a minimum of 1 beats per min.