Typical Hydronic System and Primary-Secondary Pumping ...

1 SUBJECT: Typical Hydronic System AND FYI #286 6/3/2008 Primary-Secondary Pumping System SCHEMATICADVANTAGE Engineering, East Stop 18 Road Greenwood, IN 46142 317-887-0729 fax: 317-881-1277 web site: email: 4/12/2013 2013 ADVANTAGE ENGINEERING, ValveLoad 1 Chiller 1 Chiller 2 Load 2 Load 3 Furture ExpansionSecondary PumpsPrimary PumpsSecondary LoopPrimary LoopSupplyReturnPrimary - SecondaryCommon PipeFlow can go eitherdirection depending on System flow needsCompression TankAir Control Tank FittingShut Off ValveWater Supply Pressure Reducing ValveHigh CapacityAir SeparatorFromProcessTo ProcessProcess PumpsThe schematic below illustrates a Typical Primary-Secondary style Pumping System where the primarycirculation loop provides constant flow through thechiller(s) evaporators while the secondary loopprovides flow to process.

2 This style System allowsthe process flow in the secondary loop to change asrequired to meet the process needs while the chillerloop flow (primary loop) remains for closed Hydronic systems: Air separation is critical if the water piping System isopened often such as when molds are changed in moldingapplications. Hydronic systems are best applied when thepiping System is not opened such as HVAC applications. Since compression tanks hold a relatively small volume ofwater compared to open reservoir systems there is littlefluid flywheel to absorb temporary load fluctuations. Adding water treatment chemicals is more difficultcompared to a System using an open tank. The System static pressure is higher with a hydronicsystem compared to an open tank System because of theconstant fill pressure applied to the Hydronic System . Special considerations must be made when the processwater flow is different (higher or lower) then the flowrequired to support the chiller.

3 See heating, air conditioning and ventilation (HVAC) users prefer a closed Hydronic water circulation System toAdvantage Engineering s Typical open reservoir style System . Applying this style System in an industrial processapplication requires careful consideration and thorough pre-planning before selecting the System components andinstalling the of a Hydronic System include an air separator, air controlvalve, compression tank and incoming water pressure reducing schematic at right illustrates a Typical Hydronic 4/12/2013 This drawing is supplied to demonstrate a possible piping configuration. The drawing is general in nature and is not intended to be all inclusive of every detail thatmight be required for your specific location and installation. Advantage accepts no responsibility for piping and any other component supplied or installed by others.