Eventos Anais de eventos
ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Predicting Leakage of Refrigerant in the Piston Cylinder Clearance of Reciprocating Compressors
Submission Author:
Murilo Nicoluzzi , SC
Co-Authors:
Murilo Nicoluzzi, Vitor de Melo Braga, Cesar Deschamps
Presenter: Murilo Nicoluzzi
doi://10.26678/ABCM.ENCIT2020.CIT20-0261
Abstract
Leakage of refrigerant through the piston-cylinder clearance of small reciprocating compressors can significantly reduce the mass flow rate made available to the refrigeration system. This paper assesses three approaches to predict the leakage of refrigerant in a reciprocating compressor adopted in household refrigeration systems: (i) Poiseuille-Couette model for incompressible fluid flow; (ii) Reynolds equation for compressible fluid flow; (iii) correlations developed for radial leakage in scroll compressors. The effects of the operating condition, clearance dimension, compressor speed and compressibility are also included in the analysis. The results show that the compressible fluid flow formulation is required to predict the leakage and that the piston motion has negligible effect on the results.
Keywords
Reciprocating compressor, Piston-cylinder leakage, Leakage modelling
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