.TransiEnt.Producer.Heat.Gas2Heat.SmallGasBoiler.Utilities.RT2EfficiencyCharline

Information

1. Purpose of model

This block calculates a boiler's efficiency from the return temperature of the heating system (heat carrier).

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

The efficiency of a boiler is both depending on the part load and the return temperature of the heat carrier. This block considers the latter with a representative characteristical line giving the efficiency for a certain return temperature range.

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

3. Limits of validity

(no remarks)

4. Interfaces

• T_return: input value of the return temperature
• eta: output value of the heating efficiency

5. Nomenclature

(no remarks)

6. Governing Equations

(no equations)

7. Remarks for Usage

(no remarks)

8. Validation

(no remarks)

9. References

Planungsunterlage Ecostream-Gasheizkessel Logano GE434 und Gas-Brennwertkessel Logano plus GB434 – 09/2005

10. Version History

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

Modified by Lisa Andresen (andresen@tuhh.de) Nov 2016