Low-GWP refrigerants performance evaluation: R513A and R515B boiling within smooth and microfinned tubes

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Thermal Sciences Pub Date : 2025-01-22 DOI:10.1016/j.ijthermalsci.2025.109724

Mahmood Hasan Oudah, Zahraa Kareem Yasser

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引用次数: 0

Abstract

Environmental concerns and stricter regulations lead the refrigeration industry to consider low-GWP (Global Warming Potential) refrigerants as replacements for traditional high-GWP refrigerants, such as R134a. R513A and R515B have emerged as promising candidates due to their low GWP and non-flammability, making them sustainable alternatives. This study experimentally examines the boiling heat transfer characteristics of R513A and R515B during flow in smooth and microfinned tubes, which play a crucial role in enhancing heat transfer performance in refrigeration systems. The experimental setup consists of a 400 mm long tube-in-tube heat exchanger with an internal diameter of 4.3 mm and an outer diameter of 5.0 mm. The test conditions consist of mass fluxes (MF) ranging from 152 to 500 kg/m²·s, heat fluxes (HF) between 13 and 40 kW/m², vapor quality from 0.15 to 0.98, and saturation temperatures (T_s) of 10 °C and 20 °C. The results reveal that the microfinned tube substantially enhances the heat transfer coefficient (HTC) compared to the smooth tube, with R515B steadily exhibiting higher HTCs than R513A. In addition, the experimental data were compared with predictions from correlations available in the open literature, highlighting areas of agreement and disagreement.

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.