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

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journal

13 Scopus Citations
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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)597-606
Journal / PublicationApplied Energy
Volume98
Publication statusPublished - Oct 2012
Externally publishedYes

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. © 2012 Elsevier Ltd.

Research Area(s)

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