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

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 1D 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. An object oriented approach for the numerical simulation of the thermal and fluid dynamic behavior of hermetic reciprocating compressors has been developed, verified and experimentally validated (Damle et al., 2008). The compressor domain is formed by connecting individual elements such as tubes, chambers, compression chambers, valve plates, etc., which exchange information (pressure, temperature, mass flow etc.) between themselves. The numerical model analyses the fluid flow based on full integration of the one-dimensional transient governing equations (continuity, momentum and energy) through each one of the compressor elements (objects from a C++ point of view). The coupled system is solved until convergence is reached. This procedure allows coupling each type of geometry desired with the possibility to add Computational Fluid Dynamics and Heat Transfer (CDF&HT) code to solve elements of the compressor integrated with the general compressor model. A new unstructured and parallel object-oriented CFD&HT code for accurate and reliable solving of turbulent industrial flows (2), called TermoFluids, has been developed in a spin-off created by different researchers of CTTC Group. A multi-dimensional explicit finite volume fractional-step based algorithm has been used with symmetry preserving discretization scheme. The turbulence modeling is an extension of the Yoshizawa nonequilibrium fixedparameter subgrid-scale model to non-structured meshes. The pressure equation is solved by means of parallel