Thermal Performance in Heat Exchangers by the Irreversibility, Effectiveness, and Efficiency Concepts Using Nanofluids

Author(s): Nogueira E.

Affiliation(s): Department of Mechanics and Energy, State University of Rio de Janeiro, Brazil.

*Corresponding Author’s Address: [email protected]

Issue: Volume 7, Issue 2 (2020)

Paper received: April 28, 2020
The final version of the paper received: August 14, 2020
Paper accepted online: August 28, 2020

Nogueira, E. (2020). Thermal performance in heat exchangers by the irreversibility, effectiveness, and efficiency concepts using nanofluids. Journal of Engineering Sciences, Vol. 7(2), pp. F1–F7, doi: 10.21272/jes.2020.7(2).f1

DOI: 10.21272/jes.2020.7(2).f1

Research Area:  CHEMICAL ENGINEERING: Processes in Machines and Devices

Abstract. The objective of the work is to obtain the outlet temperatures of the fluids in a shell and tube heat exchanger. The second law of thermodynamics is applied through the concepts of efficiency, effectiveness, and irreversibility to analyze the results. Water flows in the shell, and a mixture of water-ethylene glycol is associated with fractions of nanoparticles flows in the tube. Water enters the shell at 27 °C, and the mixture comes to the tube at 90 °C. The mass flow is kept fixed in the shell, equal to 0.23 kg/s, and varies between 0.01 kg/s to 0.50 kg/s. Volume fractions equal to 0.01, 0.10, and 0.25 were considered for analysis, for both nanoparticles from Ag and Al2O3. Results for Reynolds number, heat transfer rate, efficiency, effectiveness, and irreversibility are presented for critique, discussion, and justification of the output data found. It is shown that the flow regime has a significant effect on the performance of the analyzed heat exchanger.

Keywords: thermodynamics, second law, ethylene glycol, volume fraction.


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