Diagnosis of the low temperature difference syndrome in the chilled water system of a super high-rise building: A case study

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

15 Citations (Scopus)

Abstract

The low delta-T syndrome exists in many large primary-secondary chilled water systems, which results in the degradation of the system overall energy performance. This paper presents a method and a case study on diagnosing the low delta-T problem resulted from the deficit flow that frequently occurred in the chilled water system of a super high-rise building at its early operation stage. The history operation data during the days when deficit flow and low delta-T syndrome occurred are analyzed. The improper set-point of outlet water temperature on the secondary side of heat exchangers is finally diagnosed as the fault that resulted in the deficit flow and low delta-T syndrome. Diagnosis of this fault was also validated in the in situ experimental tests. The deficit flow could be eliminated if temperature set-point was reset higher. Compared with the original set-point of outlet water temperature on the secondary side of heat exchangers, 87.67. kW (72.37%) of the total power of pumps on primary and secondary sides of heat exchangers could be saved in the test cases when higher set-points were used.
Original languageEnglish
Pages (from-to)597-606
Number of pages10
JournalApplied Energy
Volume98
DOIs
Publication statusPublished - 1 Jan 2012

Keywords

  • Chilled water system
  • Deficit flow
  • Fault diagnosis
  • Low delta-T syndrome

ASJC Scopus subject areas

  • Building and Construction
  • Energy(all)
  • Mechanical Engineering
  • Management, Monitoring, Policy and Law

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