Row Item Source A-B B-C C-D E-F Duct ID eg A-B 2 Design Flowrate, m3/s “Q” Plans Slotted Hood? (If = row 3, if = row 10) “yes” “no” 3 Slot Area m2 4 Slot Velocity m/s This greyed-out section is only if you have slot type hoods - Not used in Course or 5 Slot Vp Pa Exam? 1.78 if slot hood 6 Loss Factor - attached to leg 1.0 is slot hood 7 Slots/Plenums Acceleration Factor - attached to leg 8 Plenum Loss Factor R6 + R7 9 Plenum R5 x R8 Pa Sp First divide flowrate by ideal duct velocity to get ideal duct Area and from that Diameter ….. 10 Duct Diameter m then chose a – Ducts standard available duct diameter next available size down from that
Row Item Source 2 Plans Duct ID eg A-B A-B B-C C-D E-F Design Flowrate, “Q” m3/s Slotted Hood? (If “yes” = row 3, if “no” = row 10) 3 Slots/Plenums Slot Area m2 4 Slot Velocity m/s 5 Slot Vp Pa This greyed-out section is only if you have slot type hoods - Not used in Course or Exam? 6 Loss Factor 1.78 if slot hood attached to leg - 7 Acceleration Factor 1.0 is slot hood attached to leg - 8 Plenum Loss Factor R6 + R7 9 Plenum Sp R5 x R8 Pa 10 Ducts Duct Diameter First divide flowrate by ideal duct velocity to get ideal duct Area and from that ….. Diameter – then chose a standard available duct diameter next available size down from that m