Constant temperature and humidity test box which factors affect its uniformity The national standard of the constant temperature and humidity test box has a clear requirement that within a cubic test space, the temperature uniformity in the box should be less than or equal to ±2°C. However, when we test products have some characteristics, it will affect the temperature uniformity of the room. So, what are the factors affecting the uniformity of the constant temperature and humidity test chamber? The test products affecting the uniformity of the constant temperature and humidity test chamber mainly show the characteristics of heat load, heat transfer, heat radiation, box sealing, sample placement and so on. Thermal radiation: design problems lead to inconsistencies in the design of the internal structure and space of the inspection box. Symmetrical structures can inevitably cause deviations in the internal temperature uniformity. This level is mainly reflected in the sheet metal design and Gold treatment, such as: the design of the air duct, the location of the heat pipe, the size of the fan power, and other reasons Thermal load: If the test sample in the working chamber of the test chamber is sufficiently large enough to affect the internal thermal convection, it will inevitably affect the uniformity of the internal temperature to a certain extent. For example, if the LED lighting product is placed, the product itself has luminescent heat and becomes a heat load. , then there is a great influence on the temperature uniformity. Sealing: The sealing of the cabinet and the door is not strict, for example: the sealing strip is not custom-made with seams, the door leaks, etc., thereby affecting the temperature uniformity of the working space. There are many factors that affect the uniformity of the constant temperature and humidity test chamber. The above summarizes some of the major aspects, more detailed technical information is needed, and you can always contact Wuhan Shangchen Test Equipment Co., Ltd. at any time. Rice Mill,Rice Mill Machine,Rice Grinder Machine,Small Rice Milling Machine Hunan Nongyou Machinery Group CO.,LTD , http://www.harvesterequipment.com
Heat transfer: Since the heat transfer coefficient of the top and bottom, bottom, left, and right sides of the studio is different from that of the six sides of the chamber, some holes, detection holes, test holes, etc. lead to local heat dissipation and heat transfer, and the temperature of the cabinet is not uniform. The convective heat transfer of the wall radiation is also non-uniform, affecting the temperature uniformity.
The rationality of sample selection and placement: if the test object volume is too large, or the test object is placed in the work chamber of the high and low temperature test chamber, the position or mode is not appropriate, so that the convection of the air inside is hindered and large temperature uniformity is also generated. The degree of deviation. For example, putting the test product on the side of a wind tunnel seriously affects the circulation of the wind, and of course, the temperature uniformity will be greatly affected.
Due to different inner wall structures, the temperature of the inner wall of the test chamber will also be non-uniform, thereby affecting the thermal convection in the work chamber to cause deviation of the internal temperature uniformity.