Improving the Gordon-Ng Model and Analyzing Thermodynamic Parameters to Evaluate Performance in a Water-Cooled Centrifugal Chiller

Blanca Foliaco, Antonio Bula and Peter Coombes
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Blanca Foliaco: Department of Mechanical Engineering, Universidad del Norte, Puerto Colombia 081001, Colombia
Antonio Bula: Department of Mechanical Engineering, Universidad del Norte, Puerto Colombia 081001, Colombia
Peter Coombes: School of Environment, Science and Engineering, Southern Cross University, Lismore NSW 2480, Australia

Energies, 2020, vol. 13, issue 9, 1-20

Abstract: The Gordon-Ng models are tools that have been used to estimate and evaluate the performance of various types of chillers for several years. A 550 TR centrifugal chiller plant facility was available to collect data from July and September 2018. The authors propose rearranging variables of the traditional (GNU) model based on average electric consumption and through a thermodynamic analysis comparable to the original model. Furthermore, assumptions are validated. Then, by estimation of the parameters of the new model using least square fitting with field training data and comparing to the GNU model and Braun model (based on consumption), it was shown that the proposed model provides a better prediction in order to evaluate consumption of a centrifugal chiller in regular operation, by improving the coefficient of variation (CV), CV = 3.24% and R 2 = 92.52% for a filtered sub-data. Through an algorithm built from steady-state cycle analysis, physical parameters ( S gen , Q leak,eq , R ) were estimated to compare with the same parameters obtained by regression to check the influence of the interception term in the model. It was found that without an interception term, the estimated parameters achieve relative errors (ER) below 20%. Additional comparison between external and internal power prediction is shown, with CV = 3.57 % and mean relative error (MRE) of 2.7%, achieving better accuracy than GNU and Braun model.

Keywords: Gordon-Ng model; centrifugal chiller; grey-box model; thermodynamics (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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