The causes of uneven temperature in the high and low temperature alternating heat and humidity test chamber are as follows:
1. The structure of the high and low temperature alternating heat and humidity test chamber greatly affects the temperature uniformity of the working space, and it is difficult to achieve complete symmetry due to the structure, thereby adversely affecting the temperature uniformity. The commonly used structure is that the front door is in front and the air-conditioned room is at the back of the box. This structure has good bilateral symmetry, and it is easy to reach the left and right temperature uniformity, but the structure is asymmetrical, and the front and back are completely different, which has an uneven effect on the working space temperature.
2. There is heat loss due to heat conduction effect of the tank wall (high temperature box) or leaky cold (low temperature box). In order to compensate for heat loss, there will be a difference in supply air temperature. The air supply temperature of the high temperature box is higher than the working temperature inside the box. Temperature, the air supply temperature of the low temperature box is lower than the working temperature inside the box. Therefore, the temperature difference of the supplied air also causes temperature unevenness in the working chamber.
3. Due to the incomplete equal heat transfer coefficient of the six-sided wall of the high-low temperature alternating heat and humidity test box, especially some surfaces have local heat transfer such as threading holes, resulting in uneven wall temperature, so that the wall of the box is radiated. The heat is not uniform, which affects the uniformity of the temperature field.
4, the sealing performance of the box is not good, such as the door or the hole in the threading hole, which affects the uniformity of the temperature field in the working space.
5. When the test sample is placed in the working space of the high-low temperature alternating heat and humidity test chamber, if the sample volume is too large, or the placement or position is not appropriate, the air convection is blocked, and a large temperature deviation will occur, resulting in a temperature field. Unevenness.
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