.TransiEnt.Producer.Heat.Gas2Heat.SmallGasBoiler.Utilities.Duty2EfficiencyCharline

Information

1. Purpose of model

This block calculates a boiler's efficiency from its part working load.

2. Level of detail, physical effects considered, and physical insight

The efficiency of a boiler is both depending on the part working load and the return temperature of the heat carrier. This block considers the former with a representative characteristical line giving the efficiency for a certain part load range. To compute the part working load, the nominal heat load of the boiler has to be given with the parameter Q_flow_n.

As condensing boilers have different characteristical lines than non-condening have, so the block loads different lines for a given parameter condesing. Also the reference value of the efficiency can be chosen via referenceNCV.

3. Limits of validity

(no remarks)

4. Interfaces

• Q_flow_set: input value of the heat duty
• eta: output value of the boiler's efficiency

5. Nomenclature

(no remarks)

6. Governing Equations

(no equations)

7. Remarks for Usage

(no remarks)

8. Validation

(no remarks)

9. References

(no remarks)

10. Version History

Model created by Paul Kernstock (paul.kernstock@tu-harburg.de) June 2015

Revised by Lisa Andresen (andresen@tuhh.de), Aug 2015