Effect of Working Fluid-Filling Ratio Combination on Thermosyphon Performance as Add-In Enhancer for Indoor Air Conditioning Devices

Ignacio Carvajal-Mariscal (), Jorge E. De León-Ruiz (), Jorge Vázquez-Arenas and María Venegas
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Ignacio Carvajal-Mariscal: Instituto Politécnico Nacional, ESIME–UPALM, Mexico City 07738, Mexico
Jorge E. De León-Ruiz: Centro de Investigación en Materiales Avanzados, S.C., CIMAV, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chihuahua 31136, Mexico
Jorge Vázquez-Arenas: Instituto Politécnico Nacional, Centro Mexicano para la Producción más Limpia, Mexico City 07738, Mexico
María Venegas: Departamento de Ingeniería Térmica y de Fluidos, Universidad Carlos III de Madrid, 28911 Madrid, Spain

Energies, 2022, vol. 15, issue 16, 1-15

Abstract: An experimental study is presented to account for the implementation of a two-phase closed thermosyphon pipe, for energy-saving purposes, in air conditioning systems in the context of COVID-19. The experimental setup consisted of a 0.5 m × 0.0127 m type L copper pipe which was employed as the body of the heat exchanger; an electric resistance heater of 0.1 m length located at the bottom; and a 0.25 m length water-cooled concentric condenser located at the top. The evaluation was conducted employing acetone, ethanol, and distilled water as working fluids; ranging the heat supplied at the evaporator from 25 to 125 W and the filling ratio from 20% to 40% of the total inner volume of the thermosyphon. From the data obtained, it was found that ethanol is the working fluid most susceptible to changes in operation conditions. Contrarily, distilled water was found to deliver consistent performance, up to a point that, for the analysed setup, it is considered to be independent of both, heat flow supplied at the evaporator and thermosyphon filling ratio. Meanwhile, acetone was found to be the only fluid tested that displays a directly proportional behaviour between heat absorption and dissipation. From compiling experimental data, response surfaces were constructed and used as direct and rough optimization tools. The information provided by this approach is considered to be particularly useful and is introduced for modelling and design purposes. Based on the results, it was found that acetone, within operation ranges of 34 % < ϕ < 40 % and 75 W < Q ˙ E v a p < 125 W , was the most suitable working fluid to use in a two-phase closed thermosyphon for energy-saving purposes in air conditioning applications.

Keywords: thermosyphon; heat transfer enhancement; working fluid; filling ratio; air conditioning (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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