Application of large underground seasonal thermal energy storage in district heating system: a model-based energy performance assessment of a pilot system in Chifeng, China

L. Xu, J.I. Torrens Galdiz, F. Guo, X. Yang, J.L.M. Hensen

Research output: Contribution to journalArticleAcademicpeer-review

11 Citations (Scopus)
259 Downloads (Pure)

Abstract

Seasonal thermal energy storage (STES) technology is a proven solution to resolve the seasonal discrepancy between heating energy generation from renewables and building heating demands. This research focuses on the performance assessment of district heating (DH) systems powered by low-grade energy sources with large-scale, high temperature underground STES technology. A pilot DH system, located in Chifeng, China that integrates a 0.5 million m3 borehole thermal energy storage system, an on-site solar thermal plant and excess heat from a copper plant is presented. The research in this paper adopts a model-based approach using Modelica to analyze the energy performance of the STES for two district heating system configurations. Several performance indicators such as the extraction heat, the injection heat and the storage coefficient are selected to assess the STES system performance. Results show that a lower STES discharge temperature leads to a better energy performance. A sensitivity analysis of the site properties illustrates that the thermal conductivity of soil is the most influential parameter on the STES system performance. The long-term performance of the STES is also discussed and a shorter stabilization time between one and two years could be achieved by discharging the STES at a lower temperature.

Original languageEnglish
Pages (from-to)319-328
Number of pages10
JournalApplied Thermal Engineering
Volume137
DOIs
Publication statusPublished - Mar 2018

Fingerprint

District heating
Thermal energy
Energy storage
Heating
Boreholes
Temperature
Sensitivity analysis
Thermal conductivity
Stabilization
Copper
Soils
Hot Temperature

Keywords

  • Building performance simulation
  • District heating
  • Industrial waste heat
  • Modelica
  • Seasonal thermal energy storage
  • Solar thermal collectors

Cite this

@article{5b46b9be58a84e1290b0f97beb7a1e2f,
title = "Application of large underground seasonal thermal energy storage in district heating system: a model-based energy performance assessment of a pilot system in Chifeng, China",
abstract = "Seasonal thermal energy storage (STES) technology is a proven solution to resolve the seasonal discrepancy between heating energy generation from renewables and building heating demands. This research focuses on the performance assessment of district heating (DH) systems powered by low-grade energy sources with large-scale, high temperature underground STES technology. A pilot DH system, located in Chifeng, China that integrates a 0.5 million m3 borehole thermal energy storage system, an on-site solar thermal plant and excess heat from a copper plant is presented. The research in this paper adopts a model-based approach using Modelica to analyze the energy performance of the STES for two district heating system configurations. Several performance indicators such as the extraction heat, the injection heat and the storage coefficient are selected to assess the STES system performance. Results show that a lower STES discharge temperature leads to a better energy performance. A sensitivity analysis of the site properties illustrates that the thermal conductivity of soil is the most influential parameter on the STES system performance. The long-term performance of the STES is also discussed and a shorter stabilization time between one and two years could be achieved by discharging the STES at a lower temperature.",
keywords = "Building performance simulation, District heating, Industrial waste heat, Modelica, Seasonal thermal energy storage, Solar thermal collectors",
author = "L. Xu and {Torrens Galdiz}, J.I. and F. Guo and X. Yang and J.L.M. Hensen",
year = "2018",
month = "3",
doi = "10.1016/j.applthermaleng.2018.03.047",
language = "English",
volume = "137",
pages = "319--328",
journal = "Applied Thermal Engineering",
issn = "1359-4311",
publisher = "Elsevier",

}

Application of large underground seasonal thermal energy storage in district heating system : a model-based energy performance assessment of a pilot system in Chifeng, China. / Xu, L.; Torrens Galdiz, J.I.; Guo, F.; Yang, X.; Hensen, J.L.M.

In: Applied Thermal Engineering, Vol. 137, 03.2018, p. 319-328.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Application of large underground seasonal thermal energy storage in district heating system

T2 - a model-based energy performance assessment of a pilot system in Chifeng, China

AU - Xu, L.

AU - Torrens Galdiz, J.I.

AU - Guo, F.

AU - Yang, X.

AU - Hensen, J.L.M.

PY - 2018/3

Y1 - 2018/3

N2 - Seasonal thermal energy storage (STES) technology is a proven solution to resolve the seasonal discrepancy between heating energy generation from renewables and building heating demands. This research focuses on the performance assessment of district heating (DH) systems powered by low-grade energy sources with large-scale, high temperature underground STES technology. A pilot DH system, located in Chifeng, China that integrates a 0.5 million m3 borehole thermal energy storage system, an on-site solar thermal plant and excess heat from a copper plant is presented. The research in this paper adopts a model-based approach using Modelica to analyze the energy performance of the STES for two district heating system configurations. Several performance indicators such as the extraction heat, the injection heat and the storage coefficient are selected to assess the STES system performance. Results show that a lower STES discharge temperature leads to a better energy performance. A sensitivity analysis of the site properties illustrates that the thermal conductivity of soil is the most influential parameter on the STES system performance. The long-term performance of the STES is also discussed and a shorter stabilization time between one and two years could be achieved by discharging the STES at a lower temperature.

AB - Seasonal thermal energy storage (STES) technology is a proven solution to resolve the seasonal discrepancy between heating energy generation from renewables and building heating demands. This research focuses on the performance assessment of district heating (DH) systems powered by low-grade energy sources with large-scale, high temperature underground STES technology. A pilot DH system, located in Chifeng, China that integrates a 0.5 million m3 borehole thermal energy storage system, an on-site solar thermal plant and excess heat from a copper plant is presented. The research in this paper adopts a model-based approach using Modelica to analyze the energy performance of the STES for two district heating system configurations. Several performance indicators such as the extraction heat, the injection heat and the storage coefficient are selected to assess the STES system performance. Results show that a lower STES discharge temperature leads to a better energy performance. A sensitivity analysis of the site properties illustrates that the thermal conductivity of soil is the most influential parameter on the STES system performance. The long-term performance of the STES is also discussed and a shorter stabilization time between one and two years could be achieved by discharging the STES at a lower temperature.

KW - Building performance simulation

KW - District heating

KW - Industrial waste heat

KW - Modelica

KW - Seasonal thermal energy storage

KW - Solar thermal collectors

UR - http://www.scopus.com/inward/record.url?scp=85044766725&partnerID=8YFLogxK

U2 - 10.1016/j.applthermaleng.2018.03.047

DO - 10.1016/j.applthermaleng.2018.03.047

M3 - Article

AN - SCOPUS:85044766725

VL - 137

SP - 319

EP - 328

JO - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

ER -