BAC_AC_SpSuAT_02

Application

Set value program for supply air temperature control with separate supply air set values for heating, cooling and energy recovery, including two separate characteristic set value curves for summer and winter compensation.

Interface

BAC_AC_SpSuAT_02 1:

Plant diagram 01

Plant diagram 02

Block diagram

VAR_OUTPUT

bErcActn     : BOOL;

bErcActn: Input variable to which the direction of action for the energy recovery is applied. The set value for the energy recovery is determined depending on the direction of action.
TRUE = direct = cooling; FALSE = reverse = heating

VAR_OUTPUT

rSpHtg       : REAL; 
rSpErc       : REAL; 
rSpCol       : REAL;

rSpHtg: Calculated set value of the supply air temperature for heating

rSpErc: Calculated set value of the supply air temperature for energy recovery

rSpCol: Calculated set value of the supply air temperature for cooling

Program description

Instance	Type	Task
SpColX1	FB_BACnetAVSetpoint	Input of the value for interpolation point X1 of the summer compensation for the cooling set value.
SpColX2	FB_BACnetAVSetpoint	Input of the value for interpolation point X2 of the summer compensation for the cooling set value.
SpColY1	FB_BACnetAVSetpoint	Input of the value for interpolation point Y1 of the summer compensation for the cooling set value. SpColY1 is the basic cooling set value.
SpColY2	FB_BACnetAVSetpoint	Input of the value for interpolation point Y2 of the summer compensation for the cooling set value.
SpColScale	FB_BA_Chrct02	The function block determines the summer compensation value for the cooling set value.
SpHtgX1	FB_BACnetAVSetpoint	Input of the value for interpolation point X1 of the winter compensation for the heating set value.
SpHtgX2	FB_BACnetAVSetpoint	Input of the value for interpolation point X2 of the winter compensation for the heating set value.
SpHtgY1	FB_BACnetAVSetpoint	Input of the value for interpolation point Y1 of the winter compensation for the heating set value. SpHtgY1 is the basic heating set value.
SpHtgY2	FB_BACnetAVSetpoint	Input of the value for interpolation point Y2 of the winter compensation for the heating set value.
SpHtgScale	FB_BA_Chrct02	The function block determines the winter compensation for the heating set value.
SpSuVis	FB_BA_SpSupVis	The function block is used to control the two interpolation points SpHtgY1 and SpColY1.
SelSpErc	FB_BACnetBV1204	Selection strategy set value energy recovery. TRUE: Mean value of PrSpHtg and PrSpCol; FALSE: Depends on the direction of action, defined by input bErcActn
	SEL, ADD, DIV, SEL	The result of this network supplies two set values for energy recovery. Which value is used depends on the energy recovery set value strategy, see SelSpErc
SpHtg	FB_BACnetAVDisplay	Output of the calculated supply air temperature heating set value
SpCol	FB_BACnetAVDisplay	Output of the calculated supply air temperature cooling set value
SpErc	FB_BACnetAVDisplay	Output of the calculated supply air temperature set value for energy recovery

Version history

Version number	Comments
1.0.1	First release