Evaluation of the simple thermodynamic model (gordon and Ng universal chiller model) as a fault detection and diagnosis tool for on-site centrifugal chillers

Jayaprakash Saththasivam, Gary Tang, Chow Kiat Chan, Kim Choon Ng*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

The application of Fault Detection and Diagnosis (FDD) could play a key role in operating chillers at optimum efficiency. As air conditioning consumes a significant proportion (approximately 30% to 50%) of the total power consumption of a commercial building, an effective FDD tool is very much required for a reliable and economic chiller operation. In this paper, the renowned Simple Thermodynamic Model, STM (also known as Gordon and Ng Universal Chiller Model) was utilized to detect and diagnose some of the common faults in centrifugal chillers. Based on the readily available, non-intrusive, steady state measurements extracted from the on-site chillers, the STM model was regressed to obtain two physically meaningful coefficients namely, Thermal Resistance and Internal Entropy Generation. These information-rich coefficients were then analyzed to evaluate the performances and the conditions of the chillers. Despite the large and yet complex on-site chiller operations, equipped with built-in heat recovery such as economizer and intricate control mechanisms, the predictive and diagnostic capabilities of STM in detecting chiller faults has been successfully tested and evaluated based on the data collected from on-site centrifugal chillers. Faults like condenser fouling and reduction in condenser cooling water flow rate were succinctly captured by the STM model.

Original languageEnglish (US)
Title of host publication4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
PublisherNational Taipei University of Technology
Pages69-74
Number of pages6
ISBN (Print)9868509610, 9789868509610
StatePublished - 2009
Externally publishedYes
Event4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009 - Taipei, Taiwan, Province of China
Duration: May 20 2009May 22 2009

Other

Other4th Asian Conference on Refrigeration and Air-Conditioning, ACRA 2009
CountryTaiwan, Province of China
CityTaipei
Period05/20/0905/22/09

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)

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