Modeling and model evaluation of water-cooled centrifugal chillers

Pao Yue-kong Library Electronic Theses Database

Modeling and model evaluation of water-cooled centrifugal chillers

 

Author: Lai, Kam-tim
Title: Modeling and model evaluation of water-cooled centrifugal chillers
Degree: M.Sc.
Year: 1996
Subject: Air conditioning -- Computer simulation
Hong Kong Polytechnic University -- Dissertations
Department: Multi-disciplinary Studies
Dept. of Building Services Engineering
Pages: xi, 85 leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1485239
URI: http://theses.lib.polyu.edu.hk/handle/200/4848
Abstract: A steady-state computer simulation model of water-cooled centrifugal chillers is studied and verified. The model is developed to simulate the performance of chillers under various operating conditions. The model algorithm is derived from basic thermodynamic laws and heat transfer correlations between the principle components of a centrifugal chiller. The theoretical work of the dissertation includes researches to derive the model mathematics from the basic principles and theories. The model contains a parameter identification routine to identify the model parameters for characterizing a chiller under study. The routine is tuned in this dissertation to improve the accuracy of the model in chiller performance simulation. The model can be used to simulate the performance of centrifugal chillers working on refrigerants R-12, R-134a, R-114, R-22, R-502 and R-717 (ammonia) . The model is further developed and tested in this dissertation to simulate the performance of chillers working on refrigerant R-123. The coefficients of refrigerant R-123 in the operating range of a typical R-123 chiller is incorporated into the model with aid of refrigerant tables and graph interpolation method. Refrigerant R-123 is introduced in late 1980's and is world-wide accepted as one of the refrigerants which are environmentally acceptable at present. The model is verified by comparing the simulated results with the experimental results taken in a chiller plant on the Hong Kong Island East. Measurements are taken at various operating conditions by adjusting the chiller cooling load, the chiller set-point for chilled water leaving temperature and the condenser water entering temperature. The model performs well in predicting the performance of the chiller under study. Acceptable correlations are found between the field measurement data and the model simulation results for the cases studied.

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