Detail publikace

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

Originální název

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

Anglický název

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

Jazyk

en

Originální abstrakt

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.

Anglický abstrakt

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.

Plný text v Digitální knihovně

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",
  annote="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.",
  address="MDPI",
  chapter="155925",
  doi="10.3390/en12040633",
  howpublished="online",
  institution="MDPI",
  number="4",
  volume="12",
  year="2019",
  month="february",
  pages="1--23",
  publisher="MDPI",
  type="journal article in Web of Science"
}