Operational strategies and pumping energy saving potential of the combined district heating system with peak shaving gas-fired boilers in heating substations

Haichao Wang, Lin Duanmu, Xiaozhou Wu*, Xiangli Li, Risto Lahdelma

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)

Abstract

Combined district heating (DH) systems have at least one base load heat plant and several peak-shaving heat sources, which can be installed in the primary network or in the heating substations. This article studies the combined DH system with peak-shaving gas-fired boilers in heating substations, where the peak boilers can be connected to the heat exchangers in series or parallel mode. We analyze the thermal balances for these two connection modes and obtain the analytical operational regulation formulas for them. Then we study the operational methods for each connection mode, considering the heat distribution control strategies in both primary and secondary networks. Adopted control strategies are (1) variable temperature (VT) control, (2) variable flowrate (VF) control, and (3) variable temperature and flowrate (VT-VF) control. The combinations of these three strategies in primary and secondary networks are compared in terms of pumping energy consumption. The results indicate that operational strategies should be phased into different periods according to whether the peak heating is needed or not. In addition, the pumping energy consumption for the parallel connection mode is less than that that for the series connection mode with the same operational strategy, and the VF control strategy shows better energy saving potential.

Original languageEnglish
Pages (from-to)1216-1230
Number of pages15
JournalScience and Technology for the Built Environment
Volume26
Issue number9
Early online dateJul 2020
DOIs
Publication statusPublished - 20 Oct 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • combined district heating system
  • Operational strategies
  • Gas-fired boiler
  • Peak shaving
  • Pumping energy

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