The thermal nonreciprocity in sensing coil is one of sources induced temperature drift in FOG , so the fiber loop is usually wound by quadrupole(QAD) symmetrical technique.
Presents the method of thermal performance testing of fan coil, establishes the relative mathematical model and analyses sources of uncertainty in performance testing process.
介绍了风机盘管热工性能检测的方法，建立了相关数学模型，分析了检测过程中的不确定度来源。
3
When an electric heating method is used for heating, thermal couple and heating coil should be installed closest to the bevel while should not hinder the access of welder to the joint.