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Basics of Pump Application for HVAC Systems
274 The HVAC World
10.2 Point of Selection
With the advent of variable-speed pumping, the point at which a cen-
trifugal pump is selected has become more complicated. The basic rule
that has been offered in the industry and in this book is to select the
pump as closely as possible to its best efficiency point. This rule must
be expanded to achieve efficient performance from both constant- and
variable-speed pumps. Figure 10.1 will be used to demonstrate some of
Figure 10.1 Points of pump selection and operation.
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