高低溫試驗(yàn)箱（機(jī)）的傳熱原理——熱傳導(dǎo)
熱傳導(dǎo)的散熱取決于安裝連接架及其他連接件的熱特性，有許多散熱設(shè)備和組件，規(guī)定安裝在吸熱的或其他導(dǎo)熱良好的裝置上，因而，有一定數(shù)量的熱會(huì)通過(guò)熱傳導(dǎo)有效地散發(fā)出去。試驗(yàn)箱測(cè)試標(biāo)準(zhǔn)規(guī)定應(yīng)對(duì)安裝架的熱特性作出規(guī)定，而且在進(jìn)行試驗(yàn)時(shí)再再安裝架的這些熱特性，如果高低溫試驗(yàn)箱或組件采用不止一種具有不同導(dǎo)熱值的方法安裝，則在試驗(yàn)時(shí)應(yīng)考慮zui壞情況，應(yīng)用情況不同，產(chǎn)生的zui壞情況也不相同，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、散熱試驗(yàn)樣品的高溫試驗(yàn)，因試驗(yàn)時(shí)熱的傳輸方向是由試驗(yàn)樣品到安裝架，所以，安裝架的熱傳輸量zui小時(shí)，即安裝架的導(dǎo)熱系數(shù)zui小時(shí)的傳輸方向是zui壞情況;
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、非散熱試驗(yàn)樣品的zui高試驗(yàn)，只要試驗(yàn)樣品尚未達(dá)到熱穩(wěn)定，熱就由箱壁經(jīng)安裝架傳到試驗(yàn)樣品，那么，zui壞情況是安裝架的導(dǎo)熱率大的場(chǎng)合，為了避免安裝支架的加熱時(shí)間太長(zhǎng)，從而延遲由箱壁到試驗(yàn)樣品的熱傳輸，安裝架的熱容量宜小;
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、散熱試驗(yàn)樣品和非散熱試驗(yàn)樣品的低溫試驗(yàn)，由于高低溫試驗(yàn)箱試驗(yàn)時(shí)熱是由試驗(yàn)樣品經(jīng)安裝架傳輸?shù)较浔诘模蚨鴝ui壞情況（試驗(yàn)樣品溫度zui低）是在熱傳輸效率zui高時(shí)，即在安裝架的導(dǎo)熱系數(shù)高時(shí)。
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.