Problems with the main and auxiliary lines of the heat exchanger
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The heat exchanger either operates on the main line, with the bypass fully open and no flow； Either use all the alternate routes, as there will be no traffic on the main route. Why is this?
Do you have flow meters for both the main line and the branch line? The two situations you mentioned seem to be the same situation in fact – both the main line and the secondary line are in use, but one of them has no traffic, right?
There is no positive or negative aspect to it; it’s just a title. In actual use, one has high resistance and the other has low resistance. Allocate traffic between the two lines as needed. In practice, one normally open valve is selected, while another valve is used to control the total flow rate. Strengthen the study of the principles behind processes*; once you understand those principles, there will be no problems.
Under normal circumstances, the main track is used while all secondary tracks are closed. But it is due to operational requirements. Now it is required that a small portion go along the main line and a larger portion along the secondary line; there must be a certain amount in both cases. But in reality, the heat exchanger either operates entirely on the main line – with the valves on the main line closed to 19% and those on the main line fully open – which is ineffective ； Either use all the secondary paths, set the secondary paths to 50 and keep all the primary paths open – this is ineffective.
Globe valves are selected as the control valves for the feed lines
Under normal circumstances, the main line is used; when the main line fails, the secondary line is employed