FB_BA_AC_SumNgtCol

The template represents a night cooling function for ventilation systems. It is used to cool down rooms that have been heated up during the day with cool outside air at night. The summer night cooling function serves to improve the quality of the air and to save electrical energy. Electrical energy for cooling is saved during the first hours of the next summer day.

	The initialization of the template takes place within the method FB_Init.

Block diagram

Principle diagram

Syntax

FUNCTION_BLOCK FB_BA_AC_SumNgtCol EXTENDS FB_BA_View
VAR_INPUT
  fTRm                : REAL;
  fSpRm               : REAL;
  fTWth               : REAL;
END_VAR
VAR_OUTPUT
  bQ                  : BOOL;
END_VAR
VAR_INPUT CONSTANT
  WthTLoLmt           : FB_BA_AV_Op;
  RmTHys              : FB_BA_AV_Op;
  SwiOnDiffT          : FB_BA_AV_Op;
  SwiOffDiffT         : FB_BA_AV_Op;
  Q                   : FB_BA_BV_Op;
  Sched               : FB_BA_SchedM;
END_VAR
VAR  NgtColFnct       : FB_BA_NgtCol;
END_VAR

Inputs

Name	Type	Description
fTRm	REAL	Input measured value room temperature.
fSpRm	REAL	Input setpoint room temperature.
fTWth	REAL	Input for the weather temperature.

Outputs

Name	Type	Description
bQ	BOOL	Summer night cooling switched on.

Inputs CONSTANT

Name	Type	Description
WthTLoLmt	FB_BA_AV_Op	Input of the value for the lower outside temperature. The value is intended to prevent excessive cooling.
RmTHys	FB_BA_AV_Op	Input of the room temperature hysteresis.
SwiOnDiffT	FB_BA_AV_Op	Switch-on value Temperature difference between the room temperature and the outside temperature [K].
SwiOffDiffT	FB_BA_AV_Op	Switch-off value Temperature difference between the room temperature and the outside temperature [K].
Q	FB_BA_BV_Op	The BV object indicates that night cooling is switched on.
Sched	FB_BA_SchedM	The schedule object can be used to define periods in which night cooling is enabled.

Variables

Name	Type	Description
NgtColFct	FB_BA_NgtCol	The function block is the core of the template and includes the actual control process of the night cooling program.

Requirements

Development environment	Necessary function
TwinCAT from v3.1.4024.35	TF8040 \| TwinCAT Building Automation from V5.0.0.0