Tee Fittings

Tee Fittings

can any one tell me some useful link to calculate static pressure for extract fans?

how we calculate static pressure for different type of fittings like elbows and tees used in duct work?.is there any table for calculating as tables are available for steel and copper pipe fittings that gives equivalent straight pipe length for different sizes?
i know the theory well.can u tell me some link from where i can get this K value factor?can i use equivalent length method for this?

Static Pressure loss is estimated by calculating the Velocity Pressure through each component in the ductwork system and multiplying it by a constant, known as a 'k' factor for that component, to provide an estimate of the component Static Pressure. The System Static Pressure is then the sum of all component Static Pressures, and the Velocity Pressure is calculated from the discharge air velocity.

By knowing the System Operating Point it is possible to plot a System Characteristic curve from which the performance of any fan on that system can be estimated.

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