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 and Fu Xiao

Applied Energy, 2012, vol. 98, issue C, 597-606

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, 87.67kW (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.

Keywords: Chilled water system; Low delta-T syndrome; Deficit flow; Fault diagnosis (search for similar items in EconPapers)
Date: 2012
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:appene:v:98:y:2012:i:c:p:597-606

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DOI: 10.1016/j.apenergy.2012.03.057

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