Eventos Anais de eventos
ENCIT 2018
Brazilian Congress of Thermal Sciences and Engineering
COMPUTATIONAL MODELING AND ANALYSIS OF THE CONSTRUCTIVE PARAMETERS OF A FINNED TUBE EVAPORATOR USING THE GENERATION OF ENTROPY
Submission Author:
Paulo Eduardo Lopes Barbieri , MG , Brazil
Co-Authors:
Paulo Eduardo Lopes Barbieri
Presenter: Paulo Eduardo Lopes Barbieri
doi://10.26678/ABCM.ENCIT2018.CIT18-0662
Abstract
This study aimed to improve a mathematical model, first developed by Domanski (1989) using FORTRAN language, able to predict the performance of a finned tube heat exchanger trough the tube-by-tube method. To the proposed model were incorporated louvered fins, the R134a and R1234yf refrigerant, the pressure drop of air to flow between the fins and to update the correlations used to calculate the convection coefficient of airflow and refrigerant. Additionally it was incorporated to mathematical model the compute the generated entropy during operation of the equipment. The new model was validated by comparison its results with experimental results, present in the literature. An evaluation of the generation entropy number was made according evaporator’s four parameters: type of fins and the distance between them, the distance between the tube rows and type of coolant. The results showed that the factors that most influence the entropy generation were the distance between the fins, the distance between the tube rows and the type of coolant, Besides that the largest share of irreversibility is associated with the flow of air between the fins.
Keywords
evaporator, finned tube evaporator, Compact Heat Exchanger, Entropy generation
