Chilled Water Pump Pressure

This guide covers the design and selection of a chilled water pump.

Chilled water pump pressure.

Centrifugal pumps require a net positive suction head npsh to ensure a minimal pressure on the inlet of the pump. Chilled water pumps are used in ac application multistoried buildings air conditioning is based on chilled water principle. Support pumps and piping separately so that weight of piping system does not rest on pumps or its support. The chilled water pump is used to circulate chilled water in a closed system.

Chillers can be found in residential applications commercial buildings and industrial process applications. The pumps are coupled with motors and supplied. Condensate pumps often deliver water from an atmospheric receiver to a deaerator operating at 5 psig meaning that in addition to the other heads the pump must overcome a pressure head of 5 psig. The units are generally large end suction or horizontal split casing pumps running at 1450 rpm.

In addition to minimal inlet pressure the designer needs to calculate the pressure loss from resistance of the system via pipe friction loss and most importantly the pressure drop of the inlet strainer figure 2. One psig equals 2 31 feet so the differential head in this application is 5 x 2 31 11 6 pressure head is a consideration only in some open systems. Install piping accessories hangers and supports anchors valves meters and gages and. Control of the chilled water from pressure to velocity to volume is up to the control system controlling the pumps and valve actuators in the system.

The chilled water pump is a part of an overall chilled water system that often includes a chiller piping valves fittings expansion tank air handling units and fan coil units.