The dimensions of a duct system, supplying air at 20°C to two zones 5 and 6 are shown in Fig. The flow rates to the two zones are 1.4 m3/s and 1.0 m³/s respectively. The fan generates a total pressure of 285 kPa at the entrance section 1. Calculate (a) (i) the velocity pressures in the duct sections, (ii) (ii) the total pressures at all sections from 1 to 6. (b) If a damper is installed just upstream of section 5 to make the total pressures at 5 and 6 equal, calculate the required pressure loss through the damper. 1 From L12 = 45m 2 3 L35 = 40m fan 1.4 m/s 2.4 m/s 4 D12 = 0.6 m L46 = 70m D35 = 0.5 m D46 = 0.4 m 1.0 m/s Fig. El1.2.1 Supply air duct system

The dimensions of a duct system, supplying air at 20°C to two zones 5 and 6 are shown in Fig. The flow rates to the two zones are 1.4 m3/s and 1.0 m³/s respectively. The fan generates a total pressure of 285 kPa at the entrance section 1. Calculate (a) (i) the velocity pressures in the duct sections, (ii) (ii) the total pressures at all sections from 1 to 6. (b) If a damper is installed just upstream of section 5 to make the total pressures at 5 and 6 equal, calculate the required pressure loss through the damper. 1 From L12 = 45m 2 3 L35 = 40m fan 1.4 m/s 2.4 m/s 4 D12 = 0.6 m L46 = 70m D35 = 0.5 m D46 = 0.4 m 1.0 m/s Fig. El1.2.1 Supply air duct system

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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