ACC Users Group › ACC Users Group Discussion Forums › Design › ACC Induced Draft vs. Forced Draft › Reply To: ACC Induced Draft vs. Forced Draft
From my more academic perspective the introduction of induced draft systems are indeed interesting. We have done extensive CFD on forced draft systems so there are exciting times ahead as we are looking forward to do the same for these new systems. 🙂
Another aspect to consider is that the fans will now be ingesting air at a higher temperature and hence a lower density which of course means a lower mass flow rate for the same volume flow rate. So generally fans will be working harder and hotter to obtain the mass flow rates required for adequate heat transfer.
Of course the more interesting question is what will the effect of wind be on the induced draft systems. Apart from the hazard of freezing, many systems are located in much drier, arid regions with occasional high winds. We might see quite strange forms of hot air re-circulation or rather short-circuiting for instance. If it is indeed present, the CFD will pick it up, so this will be the way to go.