BAC_AC_SpRmTH_02
Application
The template BAC_AC_SpRmTH_02 is a simple set value program for an air conditioning plant with room or extract air 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 realized via a curve function (summer/winter compensation).
The relative room humidity set values (%) are entered via the BACnet AV objects SpHHumf (humidification) and SpHDehumf (dehumidification). There is an energy-neutral zone between the lower set value (humidification) and the upper set value (dehumidification), which is monitored via the function SpHSupVis.
The two set values for the relative room humidity are converted within the template via the current room temperature to two set values for the absolute room humidity (g/kg), SpXHumf (humidification) and SpXDehumf (dehumidification).
Interface
System diagram
Block diagram
VAR_Input
rRmT : REAL;
rRmT: Measured value of the room temperature
VAR_OUTPUT
rSpT : REAL;
rSpXHumf : REAL;
rSpXDehumf : REAL;
rSpHHumf : REAL;
rSpHDehumf : REAL;
rSpT: Calculated set value for the room temperature
rSpXHumf: Set value absolute humidity; humidification
rSpXDehumf: Set value absolute humidity; dehumidification
rSpHHumf: Set value relative humidity; humidification
rSpHDehumf: Set value relative humidity; dehumidification
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. | |
SpHHumf | Input of the relative room humidity set value for humidification (%). | |
SpHDehumf | Input of the relative room humidity set value for dehumidification (%). | |
SpHSupVis | The function block is used for controlling the energy-neutral zone between the two set values SpHDehumf and SpHHumf | |
SpXHumf_HX | This function block is used to calculate the set value for the absolute room humidity (humidification). For calculating the value, the room temperature, the set value for the relative humidity SpHHumf and the barometric air pressure are required. | |
SpXHumf | Output of the calculated absolute room humidity set value for humidification (g/kg). | |
SpXDehumf_HX | This function block is used to calculate the set value for the absolute room humidity (dehumidification). For calculating the value, the room temperature, the set value for the relative humidity SpHDehumf and the barometric air pressure are required. | |
SpXDehumf | Output of the calculated absolute room humidity set value for dehumidification (g/kg). |
Version history
Version number | Comments |
|---|---|
1.0.1 | First release |