An exergy method for compressor performance analysisMéthode exergétique d'analyse des performances des compresseurs

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Abstract

An exergy method for compressor performance analysis is presented. The purpose of this is to identify and quantify defects in the use of a compressor's shaft power. This information can be used as the basis for compressor design improvements. The defects are attributed to friction, irreversible heat transfer, fluid throttling, and irreversible fluid mixing. They are described, on a common basis, as exergy destruction rates and their locations are identified. The method can be used with any type of positive displacement compressor. It is most readily applied where a detailed computer simulation program is available for the compressor. An analysis of an open reciprocating refrigeration compressor that used R12 refrigerant is given as an example. The results that are presented consist of graphs of the instantaneous rates of exergy destruction according to the mechanisms involved, a pie chart of the breakdown of the average shaft power wastage by mechanism, and a pie chart with a breakdown by location.

Résumé

On présente une méthode exergétique d'analyse des performances des compresseurs, afin d'identifier et de quantifier les dkfauts éventuels pouvant affecter leur puissance à l'arbre. Les données ainsi receullies peuvent servir à des améliorations dans la conception du compresseur. Les défauts concernés sont dûs à la friction, au transfert de chaleur irreversible, à l'étranglemént des fluides et aux mèlanges irréversibles de fluides. On le.s caracterise, sur un plan unique, en fonction de leurs taux de destruction exergetique et leurs emplacements sont indliqués. La méthode présentée convient a tous les types de compresseur volumétrique, mais particulièrement là où l'on dispose d'un programme inforrmátique de simulation détaillée du functionnement du compresseur. On donne comme example l'analyse d'un compresseur volumetrique utilisant le R12. Les résultats sont présentés sous forme de graphiques montrant les taux de destruction instantanée d'exergie, en fonction des mécanismes impliqués, ainsi que de deux graphiques ‘camembert’ montrant la répartition de la perte moyenne de capacité selon le mécanismé et selon la répartition par endroit.

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Present address: Ford Motor Company, Climate Control Division, Dearborn, MI 48120, USA

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