Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
NUMERICAL SIMULATION OF NANOFLUIDS WORKING AS SECONDARY FLUID IN REFRIGERATION SYSTEM - A COMPARISON USING THERMOPHYSICAL PROPERTIES FROM MODELS AND MEASURED EXPERIMENTALLY
Submission Author:
Felipe Lemos Renault , MG
Co-Authors:
Felipe Lemos Renault, Abdul Orlando Cárdenas Gómez, ENIO PEDONE BANDARRA FILHO
Presenter: ENIO PEDONE BANDARRA FILHO
doi://10.26678/ABCM.COBEM2017.COB17-0826
Abstract
This work is concerned with a comparison on measured and theoretical thermophysical properties of different nanofluids and use the properties to evaluate their suitability as a secondary working fluid in refrigeration systems, aiming at the external thermodynamic losses. Single-Walled Carbon Nanotubes (SWCNT) and silver nanoparticles were dispersed in distilled water to produce the nanofluid samples. A numerical simulation was performed taking into account a mathematical model for thermodynamic optimization of a heat exchanger. A comparison between the results obtained by the thermal properties measured experimentally and those ones evaluated theoretically by models were carried out, showing a notable difference among the results. The results evaluated with the experimental data show that in the case that the heat exchanger is optimized to minimize the external entropy generation, silver nanofluids (at any volumetric concentration) and the SWCNT nanofluids (at lower concentrations) presented positive results, whereas using the theoretical data indicated that silver nanofluids showed negative results and SWCNT nanofluids presented positive results both with any volumetric concentration.
Keywords
Nanofluid, thermal conductivity, viscosity, Heat Exchangers
