modelStageChangeCommand

Validation model for stage change logic

Information

This model validates Buildings.Templates.Plants.Controls.StagingRotation.StageChangeCommand in a configuration with one small unit and two large equally sized units (component avaStaOneTwo). In response to a varying flow rate, the variation of the required capacity chaSta.capReq.y triggers stage change events. The block Buildings.Templates.Plants.Controls.Utilities.StageIndex is used to illustrate how these events translate into a varying plant stage index idxSta.y.

Type	Name	Default	Description
Integer	nSta	size(chaSta.staEqu, 1)	Number of stages
Configuration
Real	cp_default	4184	Default specific heat capacity
Real	rho_default	996	Default specific heat capacity
Nominal condition
Real	capHea_nominal	sum(chaSta.capEqu)	Installed heating capacity
Real	THeaWatSup_nominal	50 + 273.15	Design HW supply temperature
Real	THeaWatRet_nominal	42 + 273.15	Design HW return temperature
Real	VHeaWat_flow_nominal	capHea_nominal/(THeaWatSup_nominal - THeaWatRet_nominal)/cp_default/rho_default	Design primary HW volume flow rate

Type	Name	Description
Buildings.Controls.OBC.CDL.Reals.Sources.TimeTable	ratV_flow	Source signal for volume flow rate ratio
Buildings.Templates.Plants.Controls.StagingRotation.StageChangeCommand	chaSta	Generate stage change command
Buildings.Controls.OBC.CDL.Reals.Sources.Constant	TSupSet	HWST setpoint
Buildings.Controls.OBC.CDL.Reals.Sources.Constant	TRet	HWRT
Utilities.StageIndex	idxSta	Compute stage index
Buildings.Controls.OBC.CDL.Logical.Sources.Constant	u1Lea	Lead equipment enable signal
Buildings.Controls.OBC.CDL.Logical.Sources.Constant[nSta]	u1AvaSta	Stage available signal
Buildings.Controls.OBC.CDL.Logical.TrueFalseHold	y1UpHol	Hold stage up command for plotting
Buildings.Controls.OBC.CDL.Logical.TrueFalseHold	y1DowHol	Hold stage down command for plotting
Buildings.Controls.OBC.CDL.Reals.MultiplyByParameter	V_flow	Scale by design flow
Buildings.Templates.Plants.Controls.StagingRotation.EquipmentEnable	enaEqu	Enable equipment
Buildings.Controls.OBC.CDL.Integers.Sources.Constant[2]	idxEquLeaLag	Indices of lead/lag equipment
Buildings.Controls.OBC.CDL.Logical.Sources.Constant[3]	u1AvaEqu	Equipment available signal
Components.Controls.StatusEmulator[3]	staEqu	Evaluate equipment status
Buildings.Templates.Plants.Controls.StagingRotation.StageCompletion	comSta	Check completion of stage change