Factors that cause temperature unevenness in the high and low temperature damp heat test chamber:
The high and low temperature damp heat test chamber is the main equipment in the temperature and humidity environment test. It mainly conducts high and low temperature and humidity tests to evaluate the product's temperature resistance and moisture resistance, so as to ensure that our products can work and operate under any environmental conditions. However, in the high-low temperature damp heat test chamber, if the temperature uniformity exceeds the allowable deviation range during the environmental test, the data obtained from the test is unreliable, and the test data cannot be used as the ultimate endurance of the material or product high and low temperature test. . So what are the reasons why the temperature uniformity exceeds the tolerance range?
1. Differences between test objects in the working chamber of high and low temperature damp heat test chamber: If the test sample in the high and low temperature test chamber is placed enough to affect the internal thermal convection, it will inevitably affect the uniformity of internal temperature to some extent, that is, temperature uniformity. . For example, if an LED lighting product is placed, the product itself has radiant heat and becomes a heat load, so there is a great influence on the temperature uniformity.
2. The design problem causes the design of the internal and external structures and spaces of the high-low temperature damp heat test chamber to reach a uniform symmetrical structure, and the asymmetrical structure will inevitably lead to deviation of the internal temperature uniformity. This level is mainly reflected in sheet metal design and sheet metal processing, such as the design of the duct, the placement of the heating tube, and the power of the fan. This type will affect the temperature uniformity inside the box.
3. Due to the different inner wall structure of the high-low temperature damp heat test chamber, the temperature of the inner wall of the test box will be uneven, which will affect the thermal convection in the working chamber, resulting in deviation of the internal temperature uniformity.
4. Since the heat transfer coefficient of the front and rear of the box wall of the studio is different, some of the threading holes, detection holes, test holes, etc. cause local heat dissipation and heat transfer, which makes the temperature of the box non-uniform, thus making the box Wall convection heat transfer is not uniform, affecting temperature uniformity.
5. The sealing of the cabinet and the door is not strict. For example, the sealing strip is not customized with joints, the door is leaking, etc., which affects the temperature uniformity of the working space.
6. If the volume of the test object is too large, or the position or mode of the test object placed in the working chamber of the high-low temperature damp heat test chamber is not suitable, the air convection inside is blocked, and a large temperature uniformity deviation is also generated. For example, placing the test product next to the air duct seriously affects the circulation of the wind, and of course the uniformity of the temperature is greatly affected.
In summary, the fear is the chief culprit influencing the temperature uniformity in the high and low temperature damp heat test box. I hope that everyone will check each of these aspects and will solve your confusion and problems.
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