Control method and device when test chamber with dynamic thermal load operates at high temperature and high humidity

Abstract

The invention provides a control method and device for a test box with dynamic thermal load when it operates at high temperature and high humidity. The test box is connected with a water mixing valve, and the water mixing valve is connected with a hot water source and a cold water source. The control method includes: performing PID calculation on the absolute temperature deviation value Delta of the set temperature and the actual temperature, and outputting the current PID_Out parameter; when the absolute temperature deviation value Delta is less than the maximum deviation value Delta_max, the process variable Diff_Q of the absolute temperature deviation value Delta is less than the maximum increase When Diff_Q_max is measured, the current PID_Out parameter does not replace and update the PID_Out_Mem memory parameter; the deviation between the PID_Out_Mem memory parameter and the current position value of the mixing valve is calculated, and when the deviation value is within the predetermined tolerance range, the mixing valve maintains the current position Position without action; when the deviation value is not within the predetermined tolerance range, the water mixing valve performs action to adjust the mixing ratio of cold water and hot water. The embodiments of the present invention can solve a large amount of dehumidification problems caused by temperature control interference existing in the prior art.

Description

technical field [0001] The invention relates to the technical field of temperature control of test chambers, in particular to a control method and device for a test chamber with a dynamic thermal load operating at high temperature and high humidity. Background technique [0002] The statements in this section only provide background information related to the present disclosure and may not constitute prior art. [0003] In the fixed value test of the test chamber, when operating at high temperature and high humidity without heat load, it is often achieved by using a refrigerant (such as R404A) combined with heating and humidification. However, when faced with a dynamic heat load (for example, 5KW) and high temperature and high humidity (temperature 90°C, humidity 90%), it is often difficult to control the temperature and humidity to the target value. The main reason is that the traditional design method often enters the refrigerant through the evaporator to cool down, and a...

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Problems solved by technology

[0005] Based on the aforementioned defects in the prior art, the embodiment of the present invention provides a control method and device for a test chamber with a dynamic thermal load operating at high temperature and high humidity, which can solve the problems in the prior art caused by temperature control interference. massive dehumidification issues

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