blockChillerSwitch

Control unit for enabling/disabling chiller

Extends from Modelica.Blocks.Icons.Block (Basic graphical layout of input/output block).

Information

The controls for enabling/disabling chiller are as follows:

The chiller is enabled when
T_{Chi_CHWST} > T_ChiSet + T_DeaBan
The chiller is disabled when
T_{Chi_CHWST} ≤ T_ChiSet

where T_{Chi_CHWST} is chiller chilled water supply temperature, T_ChiSet is set temperature for chilled water leaving chiller, and T_DeaBan is dead band to prevent short cycling.

Parameters

Type	Name	Default	Description
Modelica.Units.SI.Temperature	deaBan		Dead band of temperature to prevent chiller short cycling

Connectors

Type	Name	Description
Modelica.Blocks.Interfaces.RealInput	chiCHWST	Chiller chilled water supply temperature (water entering chiller)
Modelica.Blocks.Interfaces.BooleanOutput	y	Control signal for chiller. 1: Enable, 0: Disable
Modelica.Blocks.Interfaces.RealInput	TSet	Set temperature of chiller

Components

Type	Name	Default	Description
Modelica.Blocks.Logical.Hysteresis	hysteresis
Modelica.Blocks.Math.Add	add

Revisions

July 20, 2011, by Wangda Zuo:
Add comments, change variable names, and merge to library.
January 18, 2011, by Wangda Zuo:
First implementation.