blockController

Sidestream heat recovery chiller controller

Information

The control sequence consists of the following parts.

Heat recovery chiller enable logic: Refer to Buildings.Templates.Plants.Controls.HeatRecoveryChillers.Enable.
Heat recovery chiller CHW and HW pump control: The logic assumes constant speed pumps. The pumps are enabled as described in Buildings.Templates.Plants.Controls.HeatRecoveryChillers.Enable and disabled as described in Buildings.Templates.Plants.Controls.Pumps.Primary.DisableDedicated.
Heat recovery chiller mode control and setpoint selection: Refer to Buildings.Templates.Plants.Controls.HeatRecoveryChillers.ModeControl.

Parameters

Type	Name	Default	Description
Boolean	have_reqFlo	false	Set to true if HRC provides flow request point via network interface
Real	cp_default		Default specific heat capacity used to compute required capacity
Real	rho_default		Default fluid density used to compute required capacity
Real	dtMea	300	Duration used to compute the moving average of required capacity
Real	dtRun	15*60	Minimum runtime of enable and disable states
Real	dtLoa	10*60	Runtime with sufficient load before enabling
Real	dtTem1	3*60	Runtime with first temperature threshold exceeded before disabling
Real	dtTem2	1*60	Runtime with second temperature threshold exceeded before disabling
Information provided by designer
Real	TChiWatSup_min		Minimum allowable CHW supply temperature
Real	THeaWatSup_max		Maximum allowable HW supply temperature
Real	COPHea_nominal		Heating COP at design heating conditions
Real	capCoo_min		Minimum cooling capacity below which cycling occurs
Real	capHea_min		Minimum heating capacity below which cycling occurs

Connectors

Type	Name	Description
Buildings.Controls.OBC.CDL.Interfaces.RealInput	TChiWatRetUpsHrc	CHW return temperature upstream of HRC
Buildings.Controls.OBC.CDL.Interfaces.RealInput	TChiWatSupSet	Active CHW supply temperature setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealInput	VChiWatLoa_flow	CHW volume flow rate distributed to the loads
Buildings.Controls.OBC.CDL.Interfaces.RealInput	THeaWatRetUpsHrc	HW return temperature upstream of HRC
Buildings.Controls.OBC.CDL.Interfaces.RealInput	THeaWatSupSet	Active HW supply temperature setpoint
Buildings.Controls.OBC.CDL.Interfaces.RealInput	VHeaWatLoa_flow	HW volume flow rate distributed to the loads
Buildings.Controls.OBC.CDL.Interfaces.RealInput	TChiWatHrcLvg	HRC leaving CHW temperature
Buildings.Controls.OBC.CDL.Interfaces.RealInput	THeaWatHrcLvg	HRC leaving HW temperature
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	u1Coo	Cooling plant enable
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	u1Hea	Heating plant enable
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	u1Hrc_actual	HRC status
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	u1ReqFloChiWat	CHW flow request from HRC
Buildings.Controls.OBC.CDL.Interfaces.BooleanInput	u1ReqFloConWat	CW flow request from HRC
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput	y1	Enable command
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput	y1Coo	Mode command: true for cooling, false for heating
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput	y1PumChiWat	HRC CHW pump enable command
Buildings.Controls.OBC.CDL.Interfaces.BooleanOutput	y1PumHeaWat	HRC HW pump enable command
Buildings.Controls.OBC.CDL.Interfaces.RealOutput	TSupSet	Active supply temperature setpoint

Components

Type	Name	Description
StagingRotation.LoadAverage	loaChiWat	CHW load
StagingRotation.LoadAverage	loaHeaWat	HW load
Enable	ena	Compute enable command
ModeControl	setMod	Set mode
Pumps.Primary.DisableDedicated	pumChiWat	CHW pump control
Pumps.Primary.DisableDedicated	pumHeaWat	HW pump control
Buildings.Controls.OBC.CDL.Logical.Pre	preMod	Previous mode setting

Revisions

May 31, 2024, by Antoine Gautier:
First implementation.