The fan is in a new working point that meets both the new air supply requirements and the high efficiency. Fan characteristic curve The control method for the efficient operation of the fan is obviously, from an ideal point of view, under each intake condition, there is a point corresponding to the highest operating efficiency corresponding to a certain supply air demand, that is, an exact speed and The exact blade angle that matches it. In this way, there are an infinite number of such "best" combinations corresponding to the range of possible wind demand changes and the range of possible intake conditions. That is, from the control process described in the previous section, the computer must store an infinite number of "best" point rotational speed desired values ​​(this value corresponds to the current intake condition and the desired air volume). Such a demand control system is difficult to implement. The approach we take is to turn the "point" control target into a "face" control target.
We all make the fan speed, by changing the blade angle to meet the requirements of the air volume. In this way, the change in the rotational speed of the water-cooled screw unit is converted into a step-like change, thereby greatly reducing the number of desired values ​​of the "best combination". This system is achievable. Of course, this will not guarantee absolute efficiency. These desired speed values ​​can be gradually improved by theoretical calculations and gradual correction of field operation statistics.
Unit efficiency optimization control process. Control parameter optimization process 1 (fixed air volume optimization) Under the current environmental conditions and current working conditions, after the system gives new air volume requirements, the new speed and vane angle can be obtained along the following process: the new air volume is first converted into The amount of folded air on the common characteristic line; according to the folded air volume, a series of working state point combinations (in a limited area) that satisfy the different rotational speeds and different vane angles of the folded air volume can be inserted into the corresponding compression ratios corresponding to the working state points, Determine the actual wind pressure and take the closest point according to the exhaust pressure requirement (to compare the row ratio).
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