BAC_AC_SpRmTH_01
Application
The template BAC_AC_SpRmTH_01 is a simple set value program for an air conditioning plant with room or extractair cascade control for temperature and humidity.
There is a basic room temperature set value SpT_Y2_3. There is no energy-neutral zone between a lower set value (heating mode) and an upper set value (cooling mode). An outside temperature-dependent offset of the basic room temperature set value is realised via a curve function (summer/winter compensation).
The relative room humidity set value (%) is entered with BACnet AV object SpH.
There is no energy-neutral zone between a lower set value (humidification) and an upper set value (dehumidification) for humidity control.
The set value for the relative room humidity is converted into a set value for the absolute room humidity (g/kg) SpX within the template via the current room temperature.
Interface
System diagram
Block diagram
VAR_Input
rRmT : REAL;
rRmT: Measured value of the room temperature
VAR_OUTPUT
rSpT : REAL;
rSpX : REAL;
rSpH : Real;
rSpT: Calculated set value for the room temperature
rSpX: Calculated set value of the absolute room humidity
rSpH: Set value for the relative room humidity
Program description
Instance | Type | Task |
|---|---|---|
SpT_X1 | Input of the value for interpolation point X1 | |
SpT_X2 | Input of the value for interpolation point X2 | |
SpT_X3 | Input of the value for interpolation points X3 | |
SpT_X4 | Input of the value for interpolation point X4 | |
SpT_Y1 | Input of the value for interpolation point Y1 | |
SpT_Y2_3 | Input of the value for interpolation points Y2/Y3. The value is the base setpoint value | |
SpT_Y4 | Input of the value for interpolation point Y4 | |
T_Scale | The function block calculates the set value characteristic curve for the current room temperature, depending on the outside temperature.
| |
SpT | Output of the calculated room temperature set value. | |
SpH | Input of the set value for the relative room humidity (%). | |
SpHX | This function block is used to calculate the set value for the absolute room humidity. For calculating the value, the room temperature, the set value for the relative humidity SpH and the barometric air pressure are required. | |
SpX | Output of the calculated absolute room humidity set value (g/kg). |
Version history
Version number | Comments |
|---|---|
1.0.1 | First release |