Customer Posted July 27, 2017 Report Share Posted July 27, 2017 Hi, Any idea what is going on here, I have placed duct, simulated and it has increased in volume half way along the run? The green stub on the end is a sump, I accidently installed duct here and then deleted that bit, it played up after I ran the simulation. It has done this on levels above as well I have just noticed.? Link to comment Share on other sites More sharing options...
Craig Stewart Posted July 27, 2017 Report Share Posted July 27, 2017 Probably as change of heat from a previous simulation causing a reduction in air density. Just use the tool - reset to clear the temperatures. Go to Menu -> Tools | Reset Network Link to comment Share on other sites More sharing options...
John Armstrong Posted July 27, 2017 Report Share Posted July 27, 2017 Hi, The guys here have taken a quick look at your model. After the reset, the fluctuations are quite small, we believe that this is due to duct leakage and compression. The mass flow is steady and pressure is decreasing as expected. We will discuss with Craig when he returns to the office to see if he thinks there is something that needs further investigation. Just to confirm your concern was with the air flow in the duct was decreasing, then increasing slightly? That is the only thing in the model that looks like you are concerned with? Link to comment Share on other sites More sharing options...
Customer Posted July 27, 2017 Author Report Share Posted July 27, 2017 Thank you all, yes this is correct. I did the same as you have done and received the same results but wasn’t happy as I believe the leakage should be greater than any effect compression has, in fact as it is going downhill if anything compression should increase the rate the volume in the bag decreases (that’s a mouthful). Anyway I deleted the bag and redid the run which seemed to resolve the issue all together, not sure what caused it but thanks for having a look at it so quickly for me, much appreciated. Link to comment Share on other sites More sharing options...
Craig Stewart Posted July 27, 2017 Report Share Posted July 27, 2017 Hi Hope this is sorted out. The leakage paths are built when the duct is built. They may have been corrupted and removed at some stage which may possible if the duct is selected and moved to other layers or stages. You can see the leakage paths by clicking the ‘W’ button to enable wireframe view. Link to comment Share on other sites More sharing options...
Customer Posted July 27, 2017 Author Report Share Posted July 27, 2017 Thanks Craig, much appreciated. Link to comment Share on other sites More sharing options...
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