Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Modeling and Computational Simulation of Vapor Compression Refrigeration Systems in the quasi-Steady State Regime
Submission Author:
Leonardo Cavalheiro Martinez , PR
Co-Authors:
Leonardo Cavalheiro Martinez, Wellington Balmant, Flávio Júnior Santiago Silva, Lauber Martins, JOSÉ VIRIATO COELHO VARGAS
Presenter: Leonardo Cavalheiro Martinez
doi://10.26678/ABCM.COBEM2021.COB2021-0547
Abstract
Considering the growing energy demand and the increasingly significant use of HVAC-R equipment around the world, the development of new and efficient Vapor Compression Refrigeration Systems (VCRS) becomes an excellent alternative for minimizing this issue. One of the most effective ways to address this is through the conception of mathematical models that can predict the physical behavior of these VCRS. Therefore, in this study, a mathematical model was developed to simulate the quasi-steady state physical behavior of a Vapor Compression Cycle (VCC), considering its interaction with the refrigerated space. The mathematical modeling was individually developed for each VCC component operating in steady-state regime, then, all equations were coupled together to simulate the integrated system. The refrigerated space model, on the other hand, was based on the application of the mass and energy (the first law of thermodynamics for control volume) conservation laws and was considered a transient operation, i.e., obtaining the temperature behavior of the refrigerated space over time. This study also proposed an exergy analysis for the vapor compression cycle. This mathematical model was fully implemented with FORTRAN® language; it was able to predict the heat transfer rates involved in the evaporator, the pressure levels on the heat exchangers, the Coefficient of Performance (COP), the second law efficiency, and also, the thermal behavior of the refrigerated space, such as obtaining the pull-down time. Therefore, it is expected that the mathematical model developed in this study can be used for design, simulation, and control of VCC procedures, especially those that involve determining the first and second law efficiencies and also the assessment of the pull-down time for future thermodynamic optimization procedures.
Keywords
mathematical modeling, Computational simulation, Vapor Compression Cycle, Refrigeration Systems, Pull-Down Time
