Introduction of CFDHT Analysis into an Object Oriented One Dimensional and Transient Program for Numerically Simulate Hermetic Refrigeration Compressors

摘要

The present paper is a coupling between a modular object oriented one-dimensional and transient numerical simulation model for the thermal and fluid dynamic analysis of compressor behavior and CFD&HT code over the circulating flow between the compressor and the shell evaluated under Large Eddy Simulation turbulence models. Both computational strategies and their coupling are here presented.The use of new refrigerants, new compressor circuitry, new designs, some aspects like several parallel paths, more than one compression chamber, etc., have obliged to develop new modeling strategies. Thermal and fluid dynamic behavior of hermetic reciprocating compressors is characterized by complex heat transfer and fluid flow phenomena: three-dimensional, turbulent, fast transient, etc. Thus, CFD&HT codes coupled with the compressors numerical simulation model, under specific critical points are necessary to help on compressor improvement and efficiency optimization. The development and knowledge of both computational methodologies allow better results interpretation and deeper phenomena comprehension.As result of this research a new code which couples ID based strategies and CFD&HT analysis has been used to carry out the full numerical simulation of an hermetic reciprocating compressor. The results of this simulation are presented in this paper showing first steps in this area.