高低温试验箱（机）的传热原理——热传导

    热传导的散热取决于安装连接架及其他连接件的热特性，有许多散热设备和组件，规定安装在吸热的或其他导热良好的装置上，因而，有一定数量的热会通过热传导有效地散发出去。试验箱测试标准规定应对安装架的热特性作出规定，而且在进行试验时再再安装架的这些热特性，如果高低温试验箱或组件采用不止一种具有不同导热值的方法安装，则在试验时应考虑zui坏情况，应用情况不同，产生的zui坏情况也不相同，Heat conduction of heat depends on the thermal characteristics of the installation of connection frame and other fittings, there are a lot of cooling equipment and components, required in the endothermic or other heat conduction good device, therefore, a certain amount of heat will be distributed through heat transfer effectively. Test chamber test standard to install thermal characteristics of the regulation, and is best when tested again again, the heat transfer characteristics of the mounting bracket if high and low temperature test chamber, or components using more than one method of installation, with different values of thermal conductivity in the worst case should be considered when testing, the application situation is different, the worst case is not the same如：

　　1、散热试验样品的高温试验，因试验时热的传输方向是由试验样品到安装架，所以，安装架的热传输量zui小时，即安装架的导热系数zui小时的传输方向是zui坏情况;
1.Cooling test samples of high temperature test, due to the test when heat transfer direction is from the test sample to mounting bracket, so the heat transfer quantity the most hours on the mounting bracket, the coefficient of thermal conductivity on the mounting bracket most hours of transmission direction is the worst;

　　2、非散热试验样品的zui高试验，只要试验样品尚未达到热稳定，热就由箱壁经安装架传到试验样品，那么，zui坏情况是安装架的导热率大的场合，为了避免安装支架的加热时间太长，从而延迟由箱壁到试验样品的热传输，安装架的热容量宜小;
2.the heat dissipation test samples of the highest test, as long as the test sample has yet to reach thermal stability, heat by box walls through mounting bracket to test samples, so the worst is to install the thermal conductivity of big occasions, in order to avoid mounting bracket heating time is too long, so as to delay from the walls to test the heat transfer of the sample, the installation of heat capacity should be small;

　　3、散热试验样品和非散热试验样品的低温试验，由于高低温试验箱试验时热是由试验样品经安装架传输到箱壁的，因而zui坏情况（试验样品温度zui低）是在热传输效率zui高时，即在安装架的导热系数高时。
3.heat dissipation test samples and the heat dissipation test samples of low temperature test, due to heat is by the test sample when testing the installation frame transmission to the chest wall, so the worst lowest temperature （test sample） is highest in heat transfer efficiency, namely when the high thermal conductivity on the mounting bracket.