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High and low temperature heat transfer theory of thermal conductivity
Thermal heat conduction of the installation frame and the other connecting member connected to the thermal properties, there are many cooling equipment and components, the installation of the heat absorbing or other good thermal conductivity of the device, therefore, a certain amount of heat is effectively radiated by the heat conduction out.
Chamber test standards deal with mounting brackets to make the required thermal characteristics, and the best performing test amassing mount these thermal characteristics, high and low temperature, or if more than one component uses a different method to install thermal conductivity values??, then the test should be considered the worst case, the application is different, resulting in the worst case is not the same, such as:
1, the cooling temperature test the test sample, the test result of the heat transfer direction is from the test sample to a mounting frame, so that the mounting bracket of a minimum amount of heat transfer, the thermal conductivity of the mounting bracket of the transfer direction is the minimum worst case ;
2, the highest non-heat test sample test, as long as the test samples have not yet reached thermal stability, heat on the tank wall mounting bracket spread through the test sample, then the worst case is a mounting bracket for the thermal conductivity of the occasion, in order to avoid mounting bracket the heating time is too long, thereby delaying the test sample from the tank wall to the heat transfer, the mounting bracket of the heat capacity should be small;
3, thermal and non-thermal test sample test samples at low temperature, because the test from the test samples were heat is transferred to the tank wall mounting bracket, and therefore the worst case (test sample temperature minimum) is the most efficient heat transfer, that is the thermal conductivity of the mounting frame is high.
Note: The high and low temperature heat transfer theory is divided into three parts: convection, radiation, thermal conduction, the corresponding site in both articles, the article entitled: Principles of high and low temperature thermal convection heat transfer, high and low temperature pass heating principle of thermal radiation, high and low temperature heat transfer theory of heat conduction, click your browser!