Evaluation of the performance of the empirical correlations used to predict R134a's boiling frictional pressure drop inside smooth and corrugated tubes

Dalkılıç, Ahmet Selim; Çebi, Alican; Çelen, Ali; Awad, M. M.

doi:10.1016/j.icheatmasstransfer.2016.11.010

Cited by 7 publications

(1 citation statement)

References 47 publications

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“…This affects the flow patterns associated with the inner phase change flow and, thus, the heat transfer coefficient and pressure drop [6]. Several international research groups are studying minichannels technology to achieve a deeper understanding of flow patterns and behavior in these geometries [7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A MCDM Methodology to Determine the Most Critical Variables in the Pressure Drop and Heat Transfer in Minichannels

Hontoria

López-Belchí²,

Munier

et al. 2021

Energies

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This paper proposes a methodology aiming at determining the most influent working variables and geometrical parameters over the pressure drop and heat transfer during the condensation process of several refrigerant gases using heat exchangers with pipes mini channels technology. A multi-criteria decision making (MCDM) methodology was used; this MCDM includes a mathematical method called SIMUS (Sequential Interactive Modelling for Urban Systems) that was applied to the results of 2543 tests obtained by using a designed refrigeration rig in which five different refrigerants (R32, R134a, R290, R410A and R1234yf) and two different tube geometries were tested. This methodology allows us to reduce the computational cost compared to the use of neural networks or other model development systems. This research shows six variables out of 39 that better define simultaneously the minimum pressure drop, as well as the maximum heat transfer, saturation pressure fluid entering the condenser being the most important one. Another aim of this research was to highlight a new methodology based on operation research for their application to improve the heat transfer energy efficiency and reduce the CO2 footprint derived of the use of heat exchangers with minichannels.

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