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Performance analysis of micro-fin tubes compared to smooth tubes as a heat transfer enhancement technique for flow condensation

Ghazanfari Holagh, Shahriyar, Abdous, Mohammad Ali, Rastan, Hamidreza, Shafiee, Mahmood, Hashemian, Mehran (2022) Performance analysis of micro-fin tubes compared to smooth tubes as a heat transfer enhancement technique for flow condensation. Energy Nexus, 8 . Article Number 100154. E-ISSN 2772-4271. (doi:10.1016/j.nexus.2022.100154) (KAR id:97571)

Abstract

Heat transfer enhancement techniques are accompanied by pressure drop amplification, detrimentally affecting their performance; entropy generation analysis is an effective approach to assess heat transfer enhancement along with resulting pressure drop. Current study investigates and compares the performance of micro-fin (as a passive enhancement technique) and smooth tubes during flow condensation (for R134a refrigerant) through conducting entropy generation analysis. First, the impact of geometrical and operating variables on pressure losses and heat transfer contributions to entropy generation and total generated entropy inside both types of tubes is examined. Then, the conditions at which the application of micro-fin tubes in lieu of smooth ones is justifiable and of superior performance are identified utilizing entropy generation number. The simulation results indicate that entropy generation enhances in the micro-fin tubes as tube diameter, mass velocity, vapor quality, and wall heat flux rise, and saturation temperature declines. The same is observed in the smooth tube except for the mass velocity; an increase in this parameter leads to a decreasing-increasing trend in entropy generation. Moreover, the entropy generation number results indicate that applying micro-fin tubes rather than smooth ones is justifiable, i.e., has better performance, at lower mass velocities and vapor qualities, but higher saturation temperatures and wall heat fluxes.

Item Type: Article
DOI/Identification number: 10.1016/j.nexus.2022.100154
Uncontrolled keywords: Entropy generation analysis; Micro-fin tube; Entropy generation number; Heat transfer enhancement; Pressure drop Condensation
Subjects: T Technology > TA Engineering (General). Civil engineering (General) > TA165 Engineering instruments, meters etc. Industrial instrumentation
T Technology > TJ Mechanical engineering and machinery
Divisions: Divisions > Division of Computing, Engineering and Mathematical Sciences > School of Engineering and Digital Arts
Funders: University of Kent (https://ror.org/00xkeyj56)
Depositing User: Mahmood Shafiee
Date Deposited: 24 Oct 2022 18:57 UTC
Last Modified: 01 May 2024 14:05 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/97571 (The current URI for this page, for reference purposes)

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