Sizing, selecting pumps and circulators

摘要

The vast majority of HVAC and plumbing hydronic systems use centrifugal pumps to circulate fluids. The centrifugal pump was invented in 1689 by Denis Papin. The general principle behind the pump operation is fluids are led to the impeller hub and are then "flung" to the perimeter of the pump casing (or volute) by centrifugal force.