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...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。展开更多
An automatic cooling device has been developed by using a temperature-sensitive magnetic fluid as the coolant. A particle image velocimetry (PIV) system was used to measure the flow velocity of the fluid inside the lo...An automatic cooling device has been developed by using a temperature-sensitive magnetic fluid as the coolant. A particle image velocimetry (PIV) system was used to measure the flow velocity of the fluid inside the loop. The efficiency of the device under varying conditions such as the heat load and the power of cooling were ex- perimentally investigated. The effect of cooperation between external magnetic field and thermal field on the performance of the device was studied. As expected, a continuous flow induced by the thermal and magnetic field was observed in the loop, where heat was transferred by the circulating magnetic fluid. The synergic effect between the magnetic field and the temperature gradient has impact on the performance of the device.展开更多
文摘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。
基金Supported by the National Natural Science Foundation of China (Grant No. 50436020)
文摘An automatic cooling device has been developed by using a temperature-sensitive magnetic fluid as the coolant. A particle image velocimetry (PIV) system was used to measure the flow velocity of the fluid inside the loop. The efficiency of the device under varying conditions such as the heat load and the power of cooling were ex- perimentally investigated. The effect of cooperation between external magnetic field and thermal field on the performance of the device was studied. As expected, a continuous flow induced by the thermal and magnetic field was observed in the loop, where heat was transferred by the circulating magnetic fluid. The synergic effect between the magnetic field and the temperature gradient has impact on the performance of the device.
