Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Semi-empirical modeling of single-peed refrigerating compressors for small capacity applications aiming at range extrapolation and reduced datasets
Submission Author:
Guilherme Zanotelli , SC
Co-Authors:
Guilherme Zanotelli, Christian Hermes
Presenter: Guilherme Zanotelli
doi://10.26678/ABCM.COBEM2019.COB2019-0057
Abstract
The present work puts forward a semi-empirical methodology to modeling the vapor compression process in a piston-cylinder system. The proposed model provides the mass flow rate and the power consumption as a function of the working pressures and the inlet temperature, making use of only 6 fitting coefficients, all with physical meaning. Due to its semi-empirical nature, the model can extrapolate the fitting range without compromising its accuracy. Catalog data of 26 conventional fixed-capacity reciprocating compressors with displacements ranging from 2 to 20 cm3 were used to validate the model. Out of all data points, 97% presented errors within the band of ±10% for the mass flow rate, while 93% of the data points for the compression power were within the same error band. Additionally, the model performance was evaluated under extrapolation and reduced data set conditions. In this regard, the model performed robustly with 98% of all data points within the ±20% error band for all cases.
Keywords
Reciprocating compressor, semi-empirical model, catalog data, performance characteristics
