Enhanced pool boiling heat transfer using novel inverted trapezoid microgroove structures

Muneeshwaran, M.; Brechtl, Jamieson; Nawaz, Kashif; Yang, Cheng-Min

doi:10.1016/j.tsep.2025.103895

Enhanced pool boiling heat transfer using novel inverted trapezoid microgroove structures

Journal Article · Sun Jul 20 04:00:00 EDT 2025 · Thermal Science and Engineering Progress

DOI:https://doi.org/10.1016/j.tsep.2025.103895· OSTI ID:2573469

Muneeshwaran, M. ^[1]; ^[1]; ^[1]; Yang, Cheng-Min ^[1]

Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Pool boiling heat transfer improvements with enhanced surfaces have been extensively studied for various hydrofluorocarbon (HFC) refrigerants. However, there is a limited number of studies in the open literature that focus on the pool boiling heat transfer characteristics of hydrofluoroolefin (HFO) refrigerants on enhanced surfaces. This study aims to address this gap by analyzing the pool boiling behavior of HFO refrigerants, specifically R1234yf and R1234ze(E). Experiments were conducted on both plain surfaces and novel inverted trapezoid microgroove structures. Further, the experimental results indicate that the microgroove structures can improve heat transfer coefficients by up to 80% compared to plain surfaces. Additionally, the performance of R1234yf and R1234ze(E) was compared to that of R134. It was observed that R1234yf exhibited comparable performance to R134a, while R1234ze(E) showed slightly lower performance. To assess the influence of saturation temperature on pool boiling heat transfer, tests were conducted at different saturation temperatures of 15℃, 25℃, and 35℃. The findings revealed that the pool boiling heat transfer coefficient increases with rising saturation temperature.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Building Technologies Office

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 2573469

Journal Information:: Thermal Science and Engineering Progress, Journal Name: Thermal Science and Engineering Progress Vol. 65; ISSN 2451-9049

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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