Article
Thermodynamics
Parinya Kiatpachai, Thawatchai Kaewkamrop, Mehrdad Mesgarpour, Ho Seon Ahn, Ahmet Selim Dalkilic, Omid Mahian, Somchai Wongwises
Summary: This paper presents the air-side performance of embedded and welded spiral fin and tube heat exchangers. The experiment results show that the fin pitch has no effect on the air-side performance of embedded spiral fin and tube heat exchangers, but it does influence the air-side performance of the welded ones. The embedded spiral fin and tube heat exchanger has a higher heat transfer rate due to better fin base connections, while the pressure drop of the welded spiral fin and tube heat exchanger is greater.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Hosein Kalantari, Seyed Ali Ghoreishi-Madiseh, Jundika C. Kurnia, Agus P. Sasmito
Summary: This study quantified the conjugate heat transfer performance of liquid-gas fin and tube heat exchangers through mathematical modeling, validated against experimental data. Results suggest that within a certain Reynolds number range, larger fin length factor, fin pitch, and smaller tube diameter are more favorable for heat transfer efficiency.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Subhakanta Moharana, Mihir K. Das, Nikolay I. Pecherkin, Aleksandr N. Pavlenko, Oleg A. Volodin
Summary: The present study focuses on the development of a long-lived semi-closed microstructure tubular surface using the deformational cutting method for passive two-phase heat transfer enhancement. The results show that the semi-closed microstructure tubular surface outperforms smooth tubular surfaces in terms of lower boiling inception wall superheat and increased surface area. Furthermore, it demonstrates better performance compared to smooth and coated tubular surfaces at higher pitch to diameter ratios.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Wei Wang, Yong Shuai, Bingrui Li, Bingxi Li, Kwan-Soo Lee
Summary: Numerical evaluations were conducted on multi-tube heat exchangers with transverse corrugated tubes and helically corrugated tubes, revealing that spiral flows have little effect on thermal efficiency but can significantly inhibit flow resistance. Among the cases studied, the multi-tube heat exchanger with staggered tube arrangement of helically corrugated tube showed the best overall performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Thermodynamics
Aminhossein Jahanbin, Giovanni Semprini, Beatrice Pulvirenti
Summary: This study comprehensively investigates the performance of various nanofluids in single U-tube borehole heat exchangers (BHEs). The results show that Ag- and Cu-based nanofluids exhibit the highest heat transfer enhancement with a trade-off of higher pressure drop and required pumping power. SiO2- and TiO2water nanofluids have the lowest thermal performance but also the lowest pressure drop. A simple equation is proposed to evaluate the outlet fluid temperature for nanofluids. The study also finds that using nanofluids to reduce BHE length is not a promising choice.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Florent Herbinger, Dominic Groulx
Summary: This paper presents a series of controlled experiments on a specific PCM-heat exchanger, investigating the impact of different heat exchange configurations and operating conditions on power. By determining and applying two comparative metrics, it takes the first step towards finding design theory and rules for PCM-HX.
APPLIED THERMAL ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Thomas Fiedler, Ryan Moore, Nima Movahedi
Summary: This study investigated the heat transfer performance of a novel ZA27 metal foam heat exchanger. The enhanced heat transfer performance was attributed to the increased surface area of the metallic foam, but overall efficiency was limited by inefficient heat transfer between the internal mass stream and the copper tube.
Article
Thermodynamics
Hawatchai Keawkamrop, Lazarus Godson Asirvatham, Ahmet Selim Dalkilic, Ho Seon Ahn, Omid Mahian, Somchai Wongwi
Summary: This study experimentally investigates the performance of crimped spiral fin-and-tube heat exchangers with a small tube diameter. The results show that the fin pitch and outer diameter have significant effects on the heat transfer characteristics and friction factor. Correlations between the Nu, j, and f are proposed for designing heat exchangers in the thermal industry.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Review
Thermodynamics
M. M. Rashidi, Ibrahim Mahariq, Mohammad Alhuyi Nazari, Oussama Accouche, Muhammad Mubashir Bhatti
Summary: This article comprehensively reviews and discusses studies on entropy generation and exergy analysis of shell and tube heat exchangers, finding that modifying the thermo-physical properties of the fluids can improve efficiency, and the operating conditions of the heat exchangers play a crucial role in entropy generation.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Thermodynamics
Guanping Jian, Simin Wang, Jian Wen
Summary: The experimental results suggest that the tube-side heat transfer coefficient of spiral-wound heat exchangers increases with the winding angle, while the overall compactness is influenced by the layer and tube pitch. Friction factors are affected by winding angle and internal turbulence, and tube-side inlet temperature has a slightly negative effect on heat transfer. Correlations between Nusselt number and friction factor have been developed based on the data, with average errors of 8.04% and 6.28% respectively when compared to the experimental results.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2021)
Article
Thermodynamics
Mohammad Hossein Zolfagharnasab, Mona Zamani Pedram, Siamak Hoseinzadeh, Kambiz Vafai
Summary: This study numerically investigates several porous-filled shell and tube heat exchangers (STHXs) and finds that porous filling can improve heat transfer performance and achieve a homogeneous thermal distribution, but it also increases pressure loss. Partially porous-filling is suitable for low-scale applications.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Nae-Hyun Kim, Cheol-Hwan Kim, Ho-Seung Han
Summary: This study investigated the air-side heat transfer and pressure drop characteristics of fin-and-tube heat exchangers with oval or round tubes. Results showed that oval tube samples had better thermal performance under dry conditions, but the reverse was true under wet conditions due to poor condensate drainage from the oval tube. The pressure drops of round tube samples were larger, and under wet conditions, they were larger than under dry conditions. Also, an interesting feature was noticed where the highest j factor was obtained at a two-row configuration.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Yitong Tian, Ming Zhong, Shaojun Li
Summary: This study extends the concept of multi-period heat integration to a multiplant scale to recover more waste heat. By establishing a heat exchanger network model with safety redundancy, the continuous operation of remaining plants can be guaranteed during an unplanned shutdown in one plant. The optimization results show that the one-step synthesis method using a bi-level optimization strategy can find the system configuration with a lower total cost.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Minjoong Kim, Changho Han, Changhyeon Baek, Yongchan Kim
Summary: This study experimentally investigates the air-side heat transfer enhancement in fin-tube heat exchangers (FTHEs) by applying forced vibrations. The heat transfer performance of the FTHEs was measured by varying the air-side Reynolds number, vibrational frequency, vibrational amplitude, and fin pitch. The results show that the heat transfer enhancement increases with an increase in the vibrational frequency, amplitude, and fin pitch, while it decreases with an increase in the air-side Reynolds number. A correlation for heat transfer enhancement using forced vibrations is developed, which can be used for predicting the effect of vibrations on FTHE design.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Mehmet Tahir Erdinc
Summary: This study investigates the 3D fluid flow and heat transfer analysis as well as geometric optimization of two rows circular and elliptic wavy fin and tube heat exchangers (FTHEs). The performances of circular and elliptic FTHEs are compared through numerical optimization and CFD analysis, and it is found that the elliptic FTHE outperforms the circular FTHE in terms of thermal-hydraulic performance and fin efficiency.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
