TY - GEN

T1 - A Nonlinear Optimization Method for the Topological Design of District Heating Systems

AU - Lambert, Jerry

AU - Herrmann, Stephan

AU - Spliethoff, Hartmut

N1 - Publisher Copyright:
© Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems.

PY - 2022

Y1 - 2022

N2 - In this paper, a method is presented to find optimal topology, pipe sizing, and operational parameters of a district heating system. The current high costs of district heating systems set limits for building new networks regarding the minimum heat demand density. Potential for cost reduction is offered by optimized routing with ideal pipe sizing as well as optimal operating parameters. Nonlinear optimization approaches with a simultaneous calculation of these parameters are limited to a small district heating network with few customers due to scaling computational costs. Therefore, to reduce the computational cost scaling with bigger district heating systems, the optimization problem is subdivided into two iterative subproblems. First, an initial sizing of the district heating pipes is assumed. Second, optimal hydraulic parameters and optimal pipe sizing are determined. In the subsequent optimization, the corresponding thermal solution is calculated. The solution of these two subproblems is iterated until the network converges to an optimal solution. As a proof of concept, a small-scale district heating system is optimized. With this small-scale example the correct functioning of the proposed iterative algorithm is intuitively shown.

AB - In this paper, a method is presented to find optimal topology, pipe sizing, and operational parameters of a district heating system. The current high costs of district heating systems set limits for building new networks regarding the minimum heat demand density. Potential for cost reduction is offered by optimized routing with ideal pipe sizing as well as optimal operating parameters. Nonlinear optimization approaches with a simultaneous calculation of these parameters are limited to a small district heating network with few customers due to scaling computational costs. Therefore, to reduce the computational cost scaling with bigger district heating systems, the optimization problem is subdivided into two iterative subproblems. First, an initial sizing of the district heating pipes is assumed. Second, optimal hydraulic parameters and optimal pipe sizing are determined. In the subsequent optimization, the corresponding thermal solution is calculated. The solution of these two subproblems is iterated until the network converges to an optimal solution. As a proof of concept, a small-scale district heating system is optimized. With this small-scale example the correct functioning of the proposed iterative algorithm is intuitively shown.

KW - District Heating

KW - Energy System

KW - Nonlinear Optimization

KW - Topology Optimization

UR - http://www.scopus.com/inward/record.url?scp=85195800280&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85195800280

T3 - Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

SP - 813

EP - 823

BT - Proceedings of ECOS 2022 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems

A2 - Elmegaard, Brian

A2 - Sciubba, Enrico

A2 - Blanco-Marigorta, Ana Maria

A2 - Jensen, Jonas Kjaer

A2 - Markussen, Wiebke Brix

A2 - Meesenburg, Wiebke

A2 - Arjomand Kermani, Nasrin

A2 - Zhu, Tingting

A2 - Kofler, Rene

PB - DTU Construct

T2 - 35th International Conference on Efficiency, Cost, Optimization, Simulation and Environmental Impact of Energy Systems, ECOS 2022

Y2 - 3 July 2022 through 7 July 2022

ER -