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High and low temperature test conditions to meet the requirements of ways
High and low temperature test conditions to meet the requirements of ways into four points:
1, analog effects free air chamber design conditions;
2, there is forced air circulation chamber design;
3, the tank wall radiation coefficient;
4, the thermal characteristics of the mounting bracket;
The following, we come to understand one by one:
An analog effect free air chamber design conditions:
Heating and cooling tank devices should not be placed high and low temperature working space, because the inside temperature control is dependent on the temperature variation of these components to achieve, and the tank wall temperature should also avoid large fluctuations in the radiation to reduce to a minimum the impact of the program, to obtain best results, the test case should all tank wall heating or cooling, heating or cooling of all of the liquid and the tank wall, the tank wall is to avoid large fluctuations in the temperature of a suitable method for moving , box wall emissivity should meet the test requirements for air circulation to keep relying on the test temperature chamber, the test sample tests can be placed in the box, then put the box into the test chamber to test, At this time, the volume should meet the test box size requirements, and the cartridge wall shall meet the requirements of the radiation coefficients.
Second, there is forced air circulation chamber design:
For large or high heat dissipation due to the size and can not use free air chamber test conditions of test samples should be used with air flow (with forced air circulation) of the chamber, in addition to the relevant Chamber size than the free air chamber all other requirements, the design of forced air circulation chamber are applicable, air velocity shall meet these requirements: not too small, in order to ensure that the test specimen during the test without overheating, and should not be so large that the test sample during the test appeared cold air should be as uniform as possible, vertically upward flow Fang Xiangyi to convection caused by the above change in the air flow reduced to a minimum, if the fan front box positive pressure, and the air escapes through the filter from the front tank, then uniform airflow can be obtained, in the former case can also be installed several control the temperature of the heater chamber, or the use of the heater and the combined effect of the filter mesh heater.
Third, the tank wall radiation coefficient:
If you want to simulate infinite space free air conditions should be hot black box wall, for operating under moderate temperature processing chamber wall, most matt paint can fully meet the requirements.
Fourth, the thermal characteristics of the mounting bracket:
Thermal characteristics of the installation frame requirements can refer to the appropriate standards, a variety of materials, thermal system can refer to the appropriate standard, if the mounting bracket or cable (eg lead) the thermal conductivity of the test results have a significant impact, leads in all tests line length is constant.