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research-article

Data-Driven Pre-Design Tool for Small Scale Centrifugal Compressors in Refrigeration

[+] Author and Article Information
Violette Mounier

Laboratory for Applied Mechancial Design, École polytechnique fédérale de Lausanne, Rue de la Maladière 71b, Neuchâtel 2000, Switzerland
violette.mounier@epfl.ch

Cyril Picard

Laboratory for Applied Mechancial Design, École polytechnique fédérale de Lausanne, Rue de la Maladière 71b, Neuchâtel 2000, Switzerland
cyril.picard@epfl.ch

Jurg Schiffmann

Laboratory for Applied Mechancial Design, École polytechnique fédérale de Lausanne, Rue de la Maladière 71b, Neuchâtel 2000, Switzerland
jurg.schiffmann@epfl.ch

1Corresponding author.

ASME doi:10.1115/1.4040845 History: Received June 27, 2018; Revised July 03, 2018

Abstract

Domestic scale heat pumps and air conditioners are mainly driven by volumetric compressors. Yet the use of reduced scale centrifugal compressors is reconsidered due to their high efficiency and power density. The design procedure of centrifugal compressors starts with pre-design tools based on the Cordier line. However, the optimality of the obtained pre-design, which is the starting point of a complex and iterative process, is not guaranteed, especially for small-scale compressors operating with refrigerants. This paper proposes a data-driven pre-design tool tailored for small-scale centrifugal compressors used in refrigeration applications. The pre-design model is generated using an experimentally validated 1D code which evaluates the compressor performance as a function of its detailed geometry and operating conditions. Using a symbolic regression tool, a reduced order model that predicts the performance of a given compressor geometry has been built. The proposed pre-design model offers an alternative to the existing tools by providing a higher level of detail and flexibility. Particularly, the model includes the effect of the pressure ratio, the blade height ratio and the shroud to tip radius ratio. The analysis of the centrifugal compressor losses allows identifying the underlying phenomena that shape the new isentropic efficiency contours. Compared to the validated 1D code the new pre-design model yields deviations below 4% on the isentropic efficiency, while running 1500 times faster. The new pre-design model is therefore of significant interest when the compressor is part of an integrated system design process.

Copyright (c) 2018 by ASME
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