Question: A fan operating at 1 5 5 0 r e v m i n and at a volume flow rate of 4 . 5 m

A fan operating at 1550revmin and at a volume flow rate of 4.5m3s, develops a
head of 135 m . It is required to build a larger, but the geometrically similar fan, which
will deliver the same head and efficiency of the existing fan at a speed of 1400revmin.
a Calculate the volume flow rate of the larger fan.
b What is the non-dimensional specific speed of these fans?
A fan operating at 1 5 5 0 r e v m i n and at a

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