Enhanced pool boiling heat transfer using novel inverted trapezoid microgroove structures

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

doi:10.1016/j.tsep.2025.103895

Enhanced pool boiling heat transfer using novel inverted trapezoid microgroove structures

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

Research output: Contribution to journal › Article › peer-review

Abstract

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. 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.

Original language	English
Article number	103895
Journal	Thermal Science and Engineering Progress
Volume	65
DOIs	https://doi.org/10.1016/j.tsep.2025.103895
State	Published - Sep 2025

Funding

Notice: This manuscript has been authored in part by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). The authors would like to express their sincere gratitude to the U.S. Department of Energy – Building Technologies Office, along with technology managers Mr. Antonio Bouza and Dr. Payam Delgoshaei, for their invaluable support. We also extend our heartfelt thanks to the Building Technologies Research and Integration Center, as well as Tim Dyer, Charles Pierce, Chavez Chelo, Douglas Stringfield, Brent Massey, Anthony Gehl, Brian Goins, and Joshua Standifier for their exceptional technical assistance.

Keywords

Heat transfer coefficient
HFO refrigerants
Microgroove
Pool boiling

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10.1016/j.tsep.2025.103895

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title = "Enhanced pool boiling heat transfer using novel inverted trapezoid microgroove structures",

abstract = "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. 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.",

keywords = "Heat transfer coefficient, HFO refrigerants, Microgroove, Pool boiling",

author = "M. Muneeshwaran and Jamieson Brechtl and Kashif Nawaz and Cheng-Min Yang",

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doi = "10.1016/j.tsep.2025.103895",

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AU - Muneeshwaran, M.

AU - Brechtl, Jamieson

AU - Nawaz, Kashif

AU - Yang, Cheng-Min

PY - 2025/9

Y1 - 2025/9

N2 - 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. 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.

AB - 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. 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.

KW - Heat transfer coefficient

KW - HFO refrigerants

KW - Microgroove

KW - Pool boiling

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DO - 10.1016/j.tsep.2025.103895

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JO - Thermal Science and Engineering Progress

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ER -

Enhanced pool boiling heat transfer using novel inverted trapezoid microgroove structures

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Keywords

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