.TransiEnt.Components.Heat.VolumesValvesFittings.Pipes.DoublePipePair_L2

Information

1. Purpose of model

Usage in simulation of district heating networks with the traditional parallel supply return layout

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

(no remarks)

3. Limits of validity

(no remarks)

4. Interfaces

(no remarks)

5. Nomenclature

(no remarks)

6. Governing Equations

(no remarks)

7. Remarks for Usage

For bigger simulations deactivate volume - underestimates the thermal delay by heating / cooling of the steel pipes.

Residence time is limited to 10h to improve initialisation with no mass flow present in the system at time = 0.

Pressure loss is linearized for mass flow rates with 5% of the nominal velocity.

8. Validation

(no remarks)

9. References

Heat transfer based on: B. van der Heijde, M. Fuchs, C. Ribas Tugores "Dynamic equation-based thermo-hydraulic pipe model for district heating and cooling systems", 2017

10. Version History

Model created by Philipp Huismann (huismann@gwi-essen.de) on 10.10.2018

Model revised by Philipp Huismann (huismann@gwi-essen.de) on 07.04.2022 | Pressure Loss linearisation for small mass flow rates, Residence Time limitation

Contents

Name	Description
HeatTransfer	HeatTransfer-Model choice for district heating