Article
Thermodynamics
Rafal Andrzejczyk, Tomasz Muszynski, Tomasz Kowalczyk, Muhammad Saqib
Summary: Thermal energy storage (TES) is becoming increasingly important in automotive applications, as it can effectively reduce energy consumption, CO2 emissions, and improve thermal comfort in electric and hybrid vehicles. This paper focuses on the optimization of key coil designing parameters for TES in plug-in electric vehicles, in order to meet the ambitious target of reducing CO2 emissions by 15% in new cars by 2025. Both experimental and CFD results were used to optimize coil geometrical parameters, and a prototype of TES in the form of a honeycomb battery of individual modules was proposed. The results showed that increasing the diameter and pitch of the coil reduced melting and solidification time, and the optimization was applicable for TES with hexagonal shell geometry as well.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2023)
Article
Thermodynamics
Rafal Andrzejczyk, Muhammad Saqib, Tomasz Kowalcyzk, Hafiz Muhammad Ali
Summary: In this paper, a semi-theoretical time-dependent mathematical model of phase change in a double shell thermal energy storage module is developed. The model can be used to optimize the geometry and phase change rate of the energy storage module. The results can also be applied to shell and tube thermal energy storage design. The optimal working time for larger diameter modules is found to be around 2000 s.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Mateo Kirincic, Anica Trp, Kristian Lenic
Summary: The research numerically investigates the effect of installation of longitudinal fins on the performance enhancement of shell-and-tube latent heat thermal energy storage, comparing it with plain tube configuration. Results show that fins significantly improve the overall heat transfer, and the reduction in phase change material mass and obstruction of natural convection in the liquid phase have negligible effect on the overall latent storage thermal performance during both charging and discharging.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
Piyush Rawat, Ashwni Goyal, Ahmad Faizan Sherwani
Summary: A comparative numerical study was conducted to investigate the melting of RT42 phase change material (PCM) in a rectangular enclosure using two different fin geometries: a regular fin and a flanged fin (T-shape). The results showed that the single flanged fin system had a higher melting rate and lower cost compared to the double fin system.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
R. Deepak Selvakumar, Jian Wu, Yulong Ding, Ahmed K. Alkaabi
Summary: A numerical analysis was conducted to investigate the melting process of an organic phase change material (PCM) in a square thermal energy storage (TES) capsule with high voltage wire electrodes. The study explored the effect of electric field direction on the melting process under different grounded wall configurations. The results showed that electric field generated small vortices that influenced the melt interface, velocity distribution, and overall melting performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Amir Abdi, Mina Shahrooz, Justin N. W. Chiu, Viktoria Martin
Summary: Extending the heat transfer area is an effective way to improve the thermal performance of phase change materials with low thermal conductivity. Vertical fins have a greater impact on the solidification process compared to melting, with increasing fin volume fraction significantly enhancing solidification while having a relatively lower effect on melting. These findings can be valuable for future simulation tools and models in the field.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Sunnykumar Patel, Syeda Humaira Tasnim, Shohel Mahmud
Summary: This study presents a novel approach of charging PCM inside toroidal tubes in LHTES system. Numerical investigations reveal that fin orientation plays a dominant role in enhancing heat transfer. In the toroidal tube LHTES system, correctly oriented fins provide higher rate of energy storage and save melting time.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Prashant Saini, Atul Dhar, Satvasheel Powar
Summary: This study aims to improve the melting performance of a latent heat storage (LHS) system by designing and optimizing the fins. The research finds that natural convection has a significant impact on the melting behaviors, and using improved fin structures and increased number of fins can enhance the melting rate. Additionally, incorporating nanoparticles and metal foam can greatly improve the melting/charging time of the phase change material in the LHS system.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Mahmoud M. Selim, Hasan S. Majdi, Ali Basem, Awad Mousa, Abed Saif Alghawli
Summary: This study analyzes freezing phenomena within an enclosure with tilted fins using a non-equilibrium phase change material with nanoparticles and water. The role of particle type on thermal conductivity is considered. The buoyancy term has no significant impact on solidification, so the energy equation with unsteady source term is assumed as the main equation. The use of platelet particles and increased particle fraction enhance the freezing rate.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Energy & Fuels
Sultan M. Alghamdi, Nidal H. Abu-Hamdeh, Meshari A. Al-Ebrahim, Hussein A. Z. AL-bonsrulah, Amira M. Hussin
Summary: This research investigates the melting phenomenon in a container with two different fin lengths (L*). The combination of RT35 and Cu nanoparticles is proposed as a nano-enhanced phase change material (NEPCM). The effects of adding Cu, L*, and Stefan number (Ste) are studied, using a computational approach based on a structural mesh for simulation. The results show that higher Ste and lower L* lead to more effective melting. The addition of 4% Cu nanoparticles to the pure PCM increases the liquid fraction (LF) by 15.80% after 900 seconds in a tube with L* = 5 and Ste = 0.17.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Multidisciplinary
Amir Abdi, Justin Ningwei Chiu, Viktoria Martin
Summary: This study aims to improve the thermal performance of a latent thermal energy storage component by increasing the number of channels, which leads to a decrease in storage capacity. The thermal performance of different channel types largely depends on the area to volume ratio of the channels.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Mohit Barthwal, Dibakar Rakshit
Summary: Thermal energy storage/sink is crucial for solar energy harnessing systems, with the challenge lying in developing a suitable system for long cyclic operation. This study analyzes the melting characteristics of PCM-based latent thermal energy storage, utilizing internal-external fins for better heat dissipation. Triangular and Y-shaped fins delay melting, with Y-shaped fins showing a larger suppression ratio.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Ahmed H. N. Al-Mudhafar, Andrzej F. Nowakowski, Franck C. G. A. Nicolleau
Summary: The study investigated the enhancement of PCM thermal performance using tee shaped fins in a shell and tube heat exchanger. Results showed that tee fins accelerated PCM melting process and reduced total melting time by 33% compared to longitudinal fins.
Article
Energy & Fuels
Prashant Saini, Atul Dhar, Satvasheel Powar, Mrityunjay Doddamani
Summary: The use of Phase Change Materials (PCMs) enhances the availability of solar energy by storing a large amount of energy in a small volume. However, the poor thermal conductivity of PCMs limits their energy storage capabilities. This study improved the solidification rate of PCM in the LHTESS by combining novel fin arrangements, nanoparticles, and metal foam.
Review
Green & Sustainable Science & Technology
M. Eslami, F. Khosravi, H. R. Fallah Kohan
Summary: This paper provides a comprehensive review of various fin designs proposed for latent heat thermal energy storage systems, discussing the effects of different geometrical parameters. The study shows that an optimum number of fins, spacing, and length can be found in each case, while some parameters such as fin thickness are less important.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2021)
Article
Thermodynamics
Mert Gurturk, Hakan F. Oztop, Arif Hepbasli
Article
Thermodynamics
Mert Gurturk, Hakan F. Oztop
APPLIED THERMAL ENGINEERING
(2016)
Article
Thermodynamics
Mert Gurturk, Hakan F. Oztop
ENERGY CONVERSION AND MANAGEMENT
(2016)
Article
Thermodynamics
Mert Gurturk, Ahmet Koca, Hakan F. Otztop, Yasin Varol, Mehmet Sekerci
INTERNATIONAL JOURNAL OF GREEN ENERGY
(2017)
Article
Energy & Fuels
Nugroho Agung Pambudi, Ryuichi Itoi, Saeid Jalilinasrabady, Mert Gurturk
Article
Thermodynamics
Mert Guertuerk, Hakan F. Oztop, Nugroho Agung Pambudi
HEAT AND MASS TRANSFER
(2018)
Article
Green & Sustainable Science & Technology
Mert Gurturk, Huseyin Benli, Neslihan Kocdemir Erturk
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2018)
Article
Thermodynamics
Mert Gurturk, Hakan F. Oztop
APPLIED THERMAL ENGINEERING
(2014)
Article
Thermodynamics
Mert Gurturk, Hakan F. Oztop, Arif Hepbasli
ENERGY CONVERSION AND MANAGEMENT
(2014)
Article
Thermodynamics
Mert Gurturk
Article
Green & Sustainable Science & Technology
Mert Gurturk, Huseyin Benli, Neslihan Kocdemir Erturk
Article
Thermodynamics
Mert Gurturk, Cihangir Kale, Besir Kok
Summary: Two new Thermosiphon Heat Pipes (THP) with 25 and 40 mm diameter were designed in this study. Experimental results showed that the 25 mm THP performed better in various operating conditions with higher heat transfer coefficient values in the evaporator section compared to the 40 mm THP. The heat transfer coefficient values in the condenser section ranged between 6.84 <= h(c) <= 11.36 W/m(2) K for all operating conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Mert Gurturk, Ferhat Ucar, Murat Erdem
Summary: The study introduces novel approaches to risk assessment and investment management in solar power plant investments, as well as explores the impact of global warming on costs. The Turkish government issued support and fixed price purchasing policies to address the challenges faced by solar energy investors.
Article
Green & Sustainable Science & Technology
Huseyin Benli, Mert Gurturk, Neslihan Kocdemir Erturk
Summary: This study investigates the impact of wrong cleaning methods on the output performances of photovoltaic cells. It is found that residues of cleaning chemicals and surface damage strongly affect the I-V and P-V characteristics. External factors contribute to a 30%-40% loss in I-V and a 15%-20% loss in P-V, while human error leads to a 20%-30% loss in I-V and a 20%-25% loss in P-V.
ENVIRONMENTAL PROGRESS & SUSTAINABLE ENERGY
(2022)
Article
Thermodynamics
Mahsa Taghavi, Swapnil Sharma, Vemuri Balakotaiah
Summary: This study investigates the natural convection effects in the insulation layers of spherical storage tanks and their impact on the tanks' performance. The permeability and Rayleigh number of the insulation material are considered as key factors. The results show that as the Rayleigh number increases, new convective cells emerge and cause the cold boundary to approach the external hot boundary. In the case of large temperature differences, multiple solutions may coexist.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyang Xu, Fangjun Hong, Chaoyang Zhang
Summary: This study introduces a self-induced jet impingement device for enhancing pool boiling performance in high power electronic cooling. Through visualization and parametric investigations, the effects of this device on pool boiling performance are studied, revealing the promotion of additional liquid supply and vapor exhausting. The flow rate of the liquid jet is found to positively impact boiling performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Wenchao Ke, Yuan Liu, Fissha Biruke Teshome, Zhi Zeng
Summary: Underwater wet laser welding (UWLW) is a promising and labor-saving repair technique. A thermal multi-phase flow model was developed to study the heat transfer, fluid dynamics, and phase transitions during UWLW. The results show that UWLW creates a water keyhole, making the welding environment similar to in air laser welding.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Xingrong Lian, Lin Tian, Zengyao Li, Xinpeng Zhao
Summary: This study investigates the heat transfer mechanisms in natural fiber-derived porous structures and finds that thermal radiation has a significant impact on the thermal conductivity in low-density regions, while natural convection rarely occurs. Insulation materials derived from micron-sized natural fibers can achieve minimum thermal conductivity at specific densities. Strategies to lower the thermal conductivity include increasing porosity and incorporating nanoscale pores using nanosize fibers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Yasir A. Malik, Kilian Koebschall, Stephan Bansmer, Cameron Tropea, Jeanette Hussong, Philippe Villedieu
Summary: Ice crystal icing is a significant hazard in aviation, and accurate modeling of sticking efficiency is essential. In this study, icing wind tunnel experiments were conducted to quantify the volumetric liquid water fraction, sticking efficiency, and maximum thickness of ice layers. Two measurement techniques, calorimetry and capacitive measurements, were used to measure the liquid water content and distribution in the ice layers. The experiments showed that increasing wet bulb temperatures and substrate heat flux significantly increased sticking efficiency and maximum ice layer thickness.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinqi Hu, Tongtong Geng, Kun Wang, Yuanhong Fan, Chunhua Min, Hsien Chin Su
Summary: This study experimentally examined the heat dissipation of vibrating fans and demonstrated its inherent mechanism through numerical simulation. The results showed that the flow fields induced by the vibrating blades exhibited pulsating features and formed large-scale and small-scale vortical structures, significantly improving heat dissipation. The study also identified the impacts of different blade structures and developed a trapezoidal-folding blade, which effectively reduced the maximum temperature of the heat source and alleviated high-temperature failure crisis.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Dan-Dan Su, Xiao-Bin Li, Hong-Na Zhang, Feng-Chen Li
Summary: The boiling heat transfer of low-boiling-point working fluid is a common heat dissipation technology in electronic equipment cooling. This study analyzed the interfacial boiling behavior of R134a under different conditions and found that factors such as the initial thickness of the liquid film, solid-liquid interaction force, and initial temperature significantly affect the boiling mode and thermal resistance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Jinyi Wu, Dongke Sun, Wei Chen, Zhenhua Chai
Summary: A unified lattice Boltzmann-phase field scheme is proposed to simulate dendrite growth of binary alloys in the presence of melt convection. The effects of various factors on the growth are investigated numerically, and the model is validated through comparisons and examinations.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shaokun Ge, Ya Ni, Fubao Zhou, Wangzhaonan Shen, Jia Li, Fengqi Guo, Bobo Shi
Summary: This study investigated the temperature distribution of main cables in a suspension bridge during fire scenarios and proposed a prediction model for the maximum temperature of cables in different lane fires. The results showed that vehicle fires in the emergency lane posed a greater thermal threat to the cables.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Shuang-Ying Wu, Shi-Yao Zhou, Lan Xiao, Jia Luo
Summary: This paper investigates the two-phase flow and heat transfer characteristics of low-velocity jet impacting on a cylindrical surface. The study reveals that the heat transfer regimes are non-phase transition and nucleate boiling with the increase of heat transfer rate. The effects of jet impact height and outlet velocity on local surface temperatures are pronounced at the non-phase transition stage. The growth rates of heat transfer rate and liquid loss rate increase significantly from the non-phase transition to nucleate boiling stage.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Emad Hasani Malekshah, Wlodzimierz Wlodzimierz, Miros law Majkut
Summary: Cavitation has significant practical importance and can be controlled by air injection. This study investigates the natural to ventilated cavitation process around a hydrofoil through numerical and experimental methods. The results show that the location and rate of air injection have a meaningful impact on the characteristics of cavitation.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Feriel Yahiat, Pascale Bouvier, Antoine Beauvillier, Serge Russeil, Christophe Andre, Daniel Bougeard
Summary: This study explores the enhancement of mixing performance in laminar flow equipment by investigating the generation of chaotic advection using wall deformations in annular geometries. The findings demonstrate that the combined geometry can achieve perfect mixing at various Reynolds numbers.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Hui He, Ning Lyu, Caihua Liang, Feng Wang, Xiaosong Zhang
Summary: This study investigates the condensation, frosting, and defrosting processes on superhydrophobic surfaces with millimeter-scale structures. The results reveal that the structures can influence the growth and removal of frost crystals, with the bottom grooves creating a frost-free zone and conical edges promoting higher frost crystal heights. Two effective methods for defrosting are observed: hand-lifting the groove and airfoil retraction contraction on protruding structures. This research provides valuable insights into frost formation and defrosting on millimeter-structured superhydrophobic surfaces, with potential applications in anti-frost engineering.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Thiwanka Arepolage, Christophe Verdy, Thibaut Sylvestre, Aymeric Leray, Sebastien Euphrasie
Summary: This study developed two thermal concentrators, one with a 2D design of uniform thickness and another with a 3D design, using the coordinate transformation technique and metamaterials. By structuring the thermal conductor, the desired local density-heat capacity product and anisotropic thermal conductivities were achieved. The homogenized thermal conductivities were obtained from finite element simulations and cylindrical symmetry consideration. A 3D concentrator was fabricated using 3D metal printing and characterized using a thermal camera. Compared to devices that solely consider anisotropic conductivities, the time evolution characteristics of the metadevice designed with coordinate transformation were closer to those of an ideal concentrator.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
Article
Thermodynamics
Liangyuan Cheng, Qingyang Wang, Jinliang Xu
Summary: In this study, we investigated the supercritical heat transfer of CO2 in a horizontal tube with a diameter of 10.0 mm, covering a wide range of pressures, mass fluxes, and heat fluxes. The study revealed a non-monotonic increase in wall temperatures along the flow direction and observed both positive and negative wall temperature differences between the bottom and top tube. The findings were explained by the thermal conduction in the solid wall interacting with the stratified-wavy flow in the tube.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2024)
