Publication detail

Performant and Simple Numerical Modeling of District Heating Pipes with Heat Accumulation

KUDELA, L. CHÝLEK, R. POSPÍŠIL, J.

Original Title

Performant and Simple Numerical Modeling of District Heating Pipes with Heat Accumulation

Type

journal article in Web of Science

Language

English

Original Abstract

This paper compares approaches for accurate numerical modeling of transients in the pipe element of district heating systems. The distribution grid itself affects the heat flow dynamics of a district heating network, which subsequently governs the heat delays and entire efficiency of the distribution. For an efficient control of the network, a control system must be able to predict how “temperature waves” move through the network. This prediction must be sufficiently accurate for real-time computations of operational parameters. Future control systems may also benefit from the accumulation capabilities of pipes. In this article, the key physical phenomena affecting the transients in pipes were identified, and an efficient numerical model of aboveground district heating pipe with heat accumulation was developed. The model used analytical methods for the evaluation of source terms. Physics of heat transfer in the pipe shells was captured by one-dimensional finite element method that is based on the steady-state solution. Simple advection scheme was used for discretization of the fluid region. Method of lines and time integration was used for marching. The complexity of simulated physical phenomena was highly flexible and allowed to trade accuracy for computational time. In comparison with the very finely discretized model, highly comparable transients were obtained even for the thick accumulation wall.

Keywords

district heating; heat accumulation; pipe; numerical model; Modelica language; Julia language; performance

Authors

KUDELA, L.; CHÝLEK, R.; POSPÍŠIL, J.

Released

16. 2. 2019

Publisher

MDPI

Location

Basel, Switzerland

ISBN

1996-1073

Periodical

ENERGIES

Year of study

12

Number

4

State

Swiss Confederation

Pages from

1

Pages to

23

Pages count

23

URL

https://www.mdpi.com/1996-1073/12/4/633

Full text in the Digital Library

http://hdl.handle.net/11012/179568

BibTex

@article{BUT155925,
  author="Libor {Kudela} and Radomír {Chýlek} and Jiří {Pospíšil}",
  title="Performant and Simple Numerical Modeling of District Heating Pipes with Heat Accumulation",
  journal="ENERGIES",
  year="2019",
  volume="12",
  number="4",
  pages="1--23",
  doi="10.3390/en12040633",
  issn="1996-1073",
  url="https://www.mdpi.com/1996-1073/12/4/633"
}