The high-low temperature cycling test chamber air circulation system generally consists of a wind wheel and its drive motor. Commonly used wind turbines have two kinds of axial flow type and multi-wing centrifugal type. The drive motor generally adopts a variable frequency speed control motor to meet the demand of different temperature change rate for air volume. The design goal of the air circulation system is to form a uniform temperature and humidity field in the work chamber of the high-low temperature cycle test chamber and to meet the requirements of the specified temperature change rate. The key technology lies in the formation of a uniform temperature and humidity field air flow tissue design, and good air flow organization design. Bad, directly determine whether the indicators of high-low temperature cycle test can meet international standards. A typical four air circulation ducts are shown below.
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1. Diagram a is suitable for small test chambers. Its structure is simple and it is an air circulation method that is often used in standard constant-temperature and constant-humidity chamber test chambers.
2. Fig. b is applicable to a test chamber with a relatively large volume or a wide temperature range. Its characteristic is that the heaters and chillers on both sides of the fan are required to be placed symmetrically to avoid the uneven temperature and humidity field.
3. Diagram c is applicable to the test chamber with large volume and low temperature impact, and its advantage is that the cooling rate is fast;
4. Figure d, like Figure a, has a simple structure and is suitable for small and medium test chambers. 
