B3. A mechanical ventilation system and its system data are shown in Figure B3 and Table B3 respectively. Assume air den

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B3 A Mechanical Ventilation System And Its System Data Are Shown In Figure B3 And Table B3 Respectively Assume Air Den 1 (68.54 KiB) Viewed 28 times

B3. A mechanical ventilation system and its system data are shown in Figure B3 and Table B3 respectively. Assume air density is 1.2 kg/m?. 0.3m3/ 0.2m/ A 0.5m/ H H F FA B D 0.3m3/ 0.2m/ Figure B3 Duct Section Frictional loss for all duct sections Straight ducts B-F, C-F, E-G and D-G Straight ducts A-F, F-G and G-H Straight duct I-J Length 0.9 Pa/m 2 m 3 m 5 m Fitting Dynamic loss coefficient Cb,c of converging wyes at F and G Dynamic loss coefficient Cs.c of converging wyes at F and G Pressure loss at exhaust air louvre J Pressure loss at inlets A, B, C, D and E Table B3 Value 1.2 0.7 30 Pa 20 Pa (a) With the aid of duct sizing Chart B3, determine the diameters of all ductwork sections and the corresponding in-duct air velocities. (6 Marks) (b) Calculate the dynamic losses at the converging wyes at F and G. (3 Marks) (c) Determine the critical path of the system. (11 Marks)