Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
Thermal Efficiency and Second Law of Thermodynamics Applied in a Straight Microchannel Printed Circuit Heat Exchanger
Submission Author:
Élcio Nogueira , RJ , Brazil
Co-Authors:
Élcio Nogueira, Humberto Machado
Presenter: Humberto Machado
doi://10.26678/ABCM.ENCIT2022.CIT22-0099
Abstract
The work presents results from the application of a dimensionless theory that uses the concepts of thermal efficiency of heat exchangers and quantities associated with the second law of thermodynamics. The objective is to analyze the thermal and hydraulic performance in a Straight Microchannel Printed Circuit Heat Exchanger. Counter flow and parallel flow configurations were analyzed for water cooling using ethylene glycol based fluid and non-spherical platelet shaped Boehmite Alumina nanoparticles. Thermal efficiency, thermal effectiveness, thermal and viscous irreversibilities, thermodynamic Bejan number and outlet water temperatures are presented in graphical form. The data obtained allows to conclude that the heat exchanger can work in a range of water and coolant flows below the design parameters. With the inclusion of nanoparticles, with a volume fraction equal to 5.0%, the flow rates of the refrigerant fluid may have a slight reduction. Through the analysis carried out, it is shown that the use of nanoparticles improves the operational cost-benefit of the heat exchanger with a significant reduction in the hot water outlet temperature.
Keywords
Heat exchanger, nanoparticles, Second Law of Thermodynamics
