When the user selects the high and low temperature test chamber, there are some matters that should be noted:
1. The high and low temperature test chamber is the unobstructed channel after the test component enters the cabinet. Narrowing the channel will result in an increase in flow rate and accelerate the air flow and heat exchange between the test pieces, which is inconsistent with the reproduction of environmental conditions. Because the airflow around the test chamber sample specified in the relevant standards of temperature and air flow rate environmental testing should not exceed 1.7m / s, to prevent the heat conduction between the sample and the surrounding air is unrealistic, the average wind speed in the unloaded test chamber is 0.6 ~ 0.8m / Sec, not more than 1m / s) to meet the specified requirements. In the ratio of two spaces and areas, the flow speed can be increased by (50 ~ 100)%, and the highest average wind speed (1 m / sec to 1.7 ~) meets the standard requirements . If there is no limit, the test sample or cross-sectional area added in the experiment, the test speed will increase to the maximum wind speed exceeding the standard, and the validity of the test results will be questioned.
2. The accuracy indicators of the parameters in the working chamber of the high and low temperature test chamber (such as ambient temperature, humidity, and salt spray sedimentation rate) are tested under no-load conditions. Once the test sample is placed, the uniformity of the parameters in the test chamber will cause Affecting the test piece, the larger the space occupation, the more serious the impact. Experimental data shows that the flow temperature on the windward and leeward sides can reach 3 ~ 8 ℃, and in severe cases can reach more than 10 ℃. Therefore, we must try to meet the two requirements to ensure the uniformity of the environmental parameters around the test sample.
3. In the high and low temperature test box based on the principle of heat conduction, the temperature of the air near the wall of the box usually differs from the center temperature of the flow field by 2 to 3 ° C, which can reach 5 ° C at the high temperature limit. The temperature of the box wall and the flow field (determined by the structure and material of the box wall) at a temperature difference of nearly 2 to 3 ° C are much different from the external atmospheric environment, and the temperature difference is also greater. Therefore, the space in the range of 100 to 150 mm of the box wall is not available.
Attachment: common sense of high and low temperature test chamber
a. The high and low temperature test box is the structure of the all-in-one machine. The refrigeration system is installed in the lower part of the back of the box. There is a control system above the test box (if your company has a slightly narrow laboratory door or elevator door size, the whole machine cannot be entered. , Our company can be customized according to user needs into a split type or move the controller from the right to the top).
b. There are heaters, evaporators, fans and other equipment distributed in the air duct interlayer of the test box; 50 cable holes are installed on the left side of the test box, and the high and low temperature test box is a single door (inlaid stainless steel door handle).
c. Double-layer high temperature resistant aging silicone rubber seal for high and low temperature test chamber can effectively ensure the temperature loss of the test chamber.
d. There are observation windows, frost protection devices and lighting switch controls on the door of the high and low temperature test chamber. Use multi-layer hollow tempered glass observation window, heated defrost with glued conductive film inside, imported brand lighting fixtures, comprehensive observation and test changes in the studio.
Matters needing attention when selecting high and low temperature test chamber
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