Function Block HEATCURVE
The Function Block HEATCURVE calculates the flow temperature of a heating circuit based on the outdoor temperature, curve and the difference between supply and return temperatures.
Input TEMP_OUT
The input defines the current outdoor temperature.
Input TEMP_IN
The input defines the desired room temperature.
Input TEM_REQ
The input defines the minimum required temperature. This is not limited.
Input TEMP_DIFF
The input defines the largest difference between supply and return flow.
Input TEMP_DESIGN
Defines the design temperature. E.g.: 70°C.
Input TEMP_DESIGN_OUT
Defines the design temperature of the external cold. E.g.: -15°C.
Input TEMP_DESIGN_IN
Defines the design temperature of the room. E.g.: 20°C.
Input CURVE
This input defines the constant of the heating system. Default is 1.33. Depending on requirements, this is set as follows:
| Application | Value |
|---|---|
| Convector Heaters | 1.25 to 1.45 |
| Panel Heaters | 1.2 to 1.3 |
| Radiators | 1.3 |
| Pipes | 1.25 |
| Underfloor Heating | 1.1 |
Input THRESHOLD
Defines the threshold of the heating requirement. If this is undershot, then the flow Q equals 0.
Input MIN
Defines the minimum heating circuit temperature. E.g. 25°C.
Input MAX
Defines the maximum heating circuit temperature. E.g. 70°C.
Output Q
Returns the calculated flow temperature of the heating circuit as a floating-point number.