blockController

Condenser water pump controller

Information

Block that generates control signals for condenser water pumps control, according to ASHRAE Guideline 36-2021, section 5.20.9 Condenser water pumps.

This sequence contains three subsequences:

Enabling and disabling the lead pump should be controlled based on if the pumps are configured as headered or dedicated. If it is headered, have_heaPum = true, then use block enaLeaHeaPum. See Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Pumps.CondenserWater.Subsequences.EnableLead_headered for a description. Otherwise, use block enaLeaDedPum. See Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Pumps.CondenserWater.Subsequences.EnableLead_dedicated for a description.
The design pump speed at current stage yDesConWatPumSpe and the number of operating pumps yConWatPumNum should be output from block pumSpe. See Buildings.Controls.OBC.ASHRAE.G36.Plants.Chillers.Pumps.CondenserWater.Subsequences.Speed for a description.
The last section of the sequence is to check if current pump speed is running on the setpoint.

Type	Name	Default	Description
Boolean	have_heaPum	true	Flag of headered condenser water pumps design: true=headered, false=dedicated
Boolean	have_WSE	true	Flag of waterside economizer: true=have WSE, false=no WSE
Boolean	fixSpe	false	Flag to indicate if the plant has fix speed condenser water pump
Integer	nChi	2	Total number of chillers
Integer	nConWatPum	2	Total number of condenser water pumps
Integer	nChiSta	3	Total number of chiller stages, including stage zero but not the stages with a WSE, if applicable
Stage design speed
Integer	nPlaSta	6	Total number of plant stages, including stage zero and the stages with a WSE, if applicable
Real[nPlaSta]	staVec	{0, 0.5, 1, 1.5, 2, 2.5}	Plant stage vector, element value like x.5 means chiller stage x plus WSE
Real[nPlaSta]	desConWatPumSpe	{0, 0.5, 0.75, 0.6, 0.75, 0.9}	Design condenser water pump speed setpoints, according to current chiller stage and WSE status
Integer[nPlaSta]	desConWatPumNum	{0, 1, 1, 2, 2, 2}	Design number of condenser water pumps that should be enabled, according to current chiller stage and WSE status
Integer[nChiSta]	desChiNum	{0, 1, 2}	Design number of chiller that should be enabled, according to current chiller stage

Type	Name	Description
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput[nChi]	uChiConIsoVal	Chiller condenser water isolation valve status
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	uLeaChiEna	Lead chiller enabling status: true=lead chiller is enabled
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	uLeaChiSta	Lead chiller status: true=lead chiller proven on
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	uLeaConWatReq	Status indicating if chiller is requesting condenser water
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	uEnaPla	True: plant is just enabled
Buildings.Controls.OBC.CDL.Interfaces.IntegerInput	uChiSta	Current chiller stage that does not include WSE
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	uWSE	Water side economizer status: true = ON, false = OFF
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput	yLeaPum	Lead pump status setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	yDesConWatPumSpe	Condenser water pump design speed at current stage
Buildings.Controls.OBC.CDL.Interfaces.IntegerOutput	yConWatPumNum	Number of operating condenser water pumps