Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
Modeling and Simulation of the Absorber of an Absorption Refrigeration System
Submission Author:
Leonardo Cavalheiro Martinez , PR
Co-Authors:
Leonardo Cavalheiro Martinez, Wellington Balmant, Iago Gomes Costa, Matias Nicolas Muñoz, Luiz Rigatti, JOSÉ VIRIATO COELHO VARGAS
Presenter: Matias Nicolas Muñoz
doi://10.26678/ABCM.ENCIT2018.CIT18-0149
Abstract
The increasing energy demand and use of HVAC-R equipment make the use of absorption refrigerators an excellent alternative in the quest for sustainability. In addition, they allow for the use of waste heat as energy input, therefore becoming potentially more efficient than the vapor compression refrigeration cycle. Thus, in order to became absorption refrigerators increasingly commercially competitive, both economically and thermodynamically, this study presents a transient mathematical modeling and the computational simulation of the absorber of an absorption refrigeration system. The model equations were based on the application of the mass and energy conservation principles in a transient regime for this component. The absorber was modeled as a single control volume. Finally, with the developed mathematical model, a computational code was elaborated in Fortran® 95 language, which allowed obtaining the numerical and transient concentration responses of the chemical species present in this absorption refrigerator component. The mathematical model resulted in a system of ordinary differential equations which were integrated at time and using the 4th/5th order Runge-Kutta Fehlberg method. As a result, the proposed model can be a useful tool for simulation of the absorber in absorption refrigeration systems with transient operation because presents the concentration distribution over time and that, subsequently, used for testing different conditions of operation and optimization procedures.
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