What causes the uneven temperature of the high and low temperature test chamber?

    1. High and low temperature test chamber The difference of the test objects in the working room: If the high and low temperature test box is placed in the working room of the test sample that can affect the overall internal heat convection, it will inevitably affect the uniformity of the internal temperature to a certain extent, that is, the temperature uniformity. For example, if the LED lighting product is placed, the product itself emits light and heats, and the first-class low-temperature test box becomes a heat load, which will have a great impact on the temperature uniformity.

    2. High and low temperature test chamber Design problems make it difficult to achieve a uniform symmetrical structure in the internal structure and space design of the high and low temperature test box, and the asymmetric structure will inevitably lead to deviations in the internal temperature uniformity. This level is mainly reflected in the sheet metal design and sheet metal processing, such as the design of the air duct for the high and low temperature test box, the placement of the heating tube, and the size of the fan power. All of these will affect the temperature uniformity in the box.

    3. Due to the difference of the inner wall structure of the high and low temperature test box, the temperature of the inner wall of the test box will also be uneven, which will affect the heat convection in the working chamber and cause the deviation of the internal temperature uniformity.

    4. Due to the different heat transfer coefficients of the front, back, left, and right sides of the chamber wall of the studio, some have threading holes, detection holes, test holes, etc., which lead to local heat dissipation and heat transfer, which makes the temperature of the box uneven, which makes the box The wall radiation convection heat transfer is also uneven, which affects the temperature uniformity.

    5. The sealing of the box and the door is not strict, such as: non-customized sealing strips have joints, and the door leaks, which affects the temperature uniformity of the working space.

    6. If the volume of the test object is too large, or the position or method of the test object placed in the working chamber of the high and low temperature test chamber is not suitable, the air convection inside will be blocked, which will also cause a large deviation of the temperature uniformity. For example, placing the test product next to the air duct will seriously affect the circulation of the wind, and of course the uniformity of the temperature will be greatly affected.