The installation effects of different installation forms in ductwork are simulated by FLUENT in this paper. The results show that the pressure losses have some relations with the distances between different components. With the increasing of the distances between the two components: the pressure loss will reduce firstly in the combination of bend and reducer, then increase continuously; the pressure loss will increase firstly in the combination of bend and increaser, then reduce continuously; the pressure loss increases firstly in the combination of tee and bend, then it reduce continuously, and the main reason of pressure loss generated in the combination of gate valve and bend is relative installation position. So, Installing components reasonable can save energy in system running.

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