FB_BA_HX
This function block FB_BA_HX is used to calculate the dew point temperature, the specific enthalpy and the absolute humidity. The temperature, the relative humidity and the barometric air pressure are required for the calculation of these parameters.
Enthalpy is a measure of the energy of a thermodynamic system.
Inputs
VAR_INPUT
fT : REAL;
fHumRel : REAL;
fAP : REAL;
END_VAR
Name | Type | Description |
|---|---|---|
fT | REAL | Temperature [°C]. |
fHumRel | REAL | Relative humidity [%] |
fAP | REAL | Hydrostatic air pressure at 1013.25 hPa. |
Outputs
VAR_OUTPUT
fHumAbs : REAL;
fDewPnt : REAL;
fE : REAL;
fDHA : REAL;
fSpecV : REAL;
fTWet : REAL;
END_VAR
Name | Type | Description |
|---|---|---|
fHumAbs | REAL | Absolute humidity g water per kg dry air [g/Kg]. |
fDewPnt | REAL | Dew point temperature [°C] |
fE | REAL | Enthalpy [kJ/kg] |
fDHA | REAL | Density of moist air ρ [kg mixture/m³] |
fSpecV | REAL | Specific volume [m³/kg] |
fTWet | REAL | Wet bulb temperature [°C] |
Requirements
Development environment | Required PLC library |
|---|---|
TwinCAT from v3.1.4024.22 | Tc3_BA2 from v5.2.5.0 |