Plumbing Topic: Domestic Water Recirculation Systems Part 4

Norm HallMonday Morning Minutes, Pumps, Plumbing System Design, Domestic Water Recirculation, Balancing

The last three articles outlined pump selection in domestic water recirculation systems. In general, these systems have low flow and low head pumps. What happens in a high rise with pressure reducing valves (PRV) in the hot water supply? The pressure reducing valve introduces a fixed pressure drop which must be added to the calculations.