management

Design Of Ventilation System: Variable Speed Fan And Duct Sizing

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Calculating Required Fan Speed and PowerFirstly, we use the continuity equation which is based on mass conservation to determine the flow rates in each ducting:
The flow rate Q= Uab xAab
But since it is a circular one, the duct size (diameter) is obtained using the formula:
  d2 = 4Qab/?Uab…..(1)
d= (4×2.5/?x5)0.5= 0.7979 approximately d= 0.8m
Then we can now use the chart in Appendix from the course book, we read o…

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