An online adaptive optimal control strategy for complex building chilled water systems involving intermediate heat exchangers

Shengwei Wang, Dian Ce Gao, Yongjun Sun, Fu Xiao

Research output: Journal article publicationJournal articleAcademic researchpeer-review

39 Citations (Scopus)


This paper presents an adaptive optimal control strategy for online control of complex chilled water systems involving intermediate heat exchangers to enhance operation and energy performances. This optimal control strategy determines the optimal settings of the heat exchanger outlet water temperature (hot side) and the required operating number of heat exchangers and pumps in order to minimize the total energy consumption of pumps under varying working conditions. Adaptive method is utilized to update the key parameters of the proposed models online. A simulated virtual platform representing a chilled water system in a super high-rise building was established to validate and evaluate the proposed optimal strategy. Test results show that the strategy has enhanced control robustness and reliability, particularly in avoiding deficit flow problem. Significant energy of chilled water pumps is saved when compared with conventional methods.
Original languageEnglish
Pages (from-to)614-628
Number of pages15
JournalApplied Thermal Engineering
Issue number1
Publication statusPublished - 1 Jan 2013


  • Adaptive optimal control
  • Chilled water system
  • Deficit flow
  • Energy efficiency
  • Online adaptive model

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Industrial and Manufacturing Engineering

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