How to test curve of high and low temperature damp heat test box

How to see the test curve in the high and low temperature damp heat test box

High-low temperature heat and humidity alternating test chamber is mainly used for testing objects, such as rubber, plastic parts and other products to do high temperature, low temperature, moist heat and any combination of three and alternate tests. Then, how to set the parameters for the cycle, how to do the corresponding equipment design according to customer test requirements, so the interpretation of the cycle curve is particularly critical, otherwise, the manufactured products often fail to meet customer requirements. For example, the following is the circulatory curve of the internal and external standard of a certain automobile manufacturing enterprise on the requirements of the alternating heat and moisture in the high-low temperature wet heat alternating test chamber . Now we will interpret and analyze the wet heat and temperature rise and fall rate. The first graph shows the humidity change curve. The relative humidity at the start of the test is 70%, and then it rises to 95%. At this time, the humidity increase time is not mandatory, and after 95%, it lasts from the beginning to 5760 minutes. Keep at 40 °C.
The second graph shows the temperature change curve. After the humidity was increased to 95% and held for 5,760 minutes, the test time was immediately reduced to 25% for 60 minutes, at which time the temperature was maintained at 40°C.
After the 60-minute humidity drop, the humidity began to increase to 70%, at which time the temperature dropped to 20°C for 60 minutes.
Afterwards, maintain 70% humidity/20°C for 60 minutes.
The temperature rises from 20°C to 60°C, and the humidity increases from 70% to 95%. At this time, the heating rate must be enforced. That is, "X" is 5°C/min. From the temperature point of view, it should be (60-20)/5. = 8 minutes to complete.
After entering the constant temperature and humidity stage, followed by cooling down into the low temperature environment, the interpretation of the curve is the same as the principle of warming up, which will not be described here.
Here specifically to point out, customers require a cooling rate of 5 °C/min. Generally can be done before -10 °C, -10 °C, such as -10 degrees Celsius to -40 °C temperature stage to achieve such a rapid cooling rate technically need to be improved, such as increasing the compressor, of course, the cost has risen sharply, Perhaps it is because the solution to this problem has caused the cost to increase exponentially.
High and low temperature humidity heat curve:

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