What are the reasons that affect the temperature uniformity of cold and hot shock testers? Shanghai Baoshi Testing Equipment Co., Ltd summarized the following factors for reference only:
1. Box structure: The structure of the temperature impact tester greatly affects the temperature at work, because the structure is difficult to be completely symmetrical, which adversely affects the temperature uniformity.
2. Heat conduction: The heat conduction in the box wall is not smooth, leading to heat loss such as leaking heat (high temperature box) or leaking cold (low temperature box). In order to compensate for the heat loss, there must be a difference in the supply air temperature. The supply air temperature of the high temperature box is higher than the inside of the box. Working temperature, the supply air temperature of the low temperature box is lower than the working temperature inside the box, and this difference in supply air temperature will also make the temperature inside the test box uneven.
3. Heat transfer: Due to the different heat transfer coefficients on the six sides of the box wall, some have local heat transfer such as threading holes, which makes the box wall temperature uneven, so that the box wall radiation convection heat transfer is not uniform, affecting the test box. The temperature is uniform.
4. Thermal load: If enough test samples are placed in the working chamber of the hot and cold shock box that affect the overall internal thermal convection, it will affect the uniformity of the internal temperature to a certain extent. For example, LED lighting products have their own luminescence. When the heat is generated, it becomes a heat load, so it has a great influence on the temperature uniformity.
5. Sample size: If the sample volume is too large or the location and method of the sample are not reasonable, the indoor air convection will be blocked, and the temperature uniformity will also be affected.
6. Sealability: The tightness of the box and the door is not tight. For example, non-customized sealing strips have seams, and the door leaks air, etc., which will also affect the temperature uniformity of the working space.
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