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These plants can be made with some points.
1) Duct size: To design the duct in an auditorium calculation of cooling load and air flow rate is done. By assuming suitable air velocity (from1967 systems and equipment ASHRAE Handbook) considering noise factor, calculation of main duct is done. Then
size of rectangular duct is calculated considering minimum aspect ratio.
So maximum care is taken to apply standard rules to
design the system. Variation occurred in some points are given below
2) Branch ducting: Branch connection with low pressure are used.
3) Equal friction method is used in industry or in
existing design or in an auditorium. But equal frictional pressure drop used in industry is0.1 in.w./100ft. or0.846 N/m2/m. while designing of an auditorium,0.04 in. w /100 ft. or0.4 N/m2/m is used. Practical knowledge is very important to study and make some conclusion about this point.
4) Aspect Ratio: It is kept minimum in each design
5) CFD Analysis: It is a new tool which is applied to observe air motion through straight duct and elbow. Also it can be applied for all ducting in a building.
Due to improper shape and velocity, eddies are observed in elbow with CFD analysis. so by proper shape , eddies are minimized. Analysis of all ducting
