Article
Green & Sustainable Science & Technology
Zhanjun Guo, Wu Zhou, Sen Liu, Zhangyang Kang, Rufei Tan
Summary: Internationally, energy-storage technologies have promoted the utilization of renewable energy and improved energy efficiency. This study focuses on the efficiency of vertical shell-and-tube energy-storage systems and investigates the influence of different heat-transfer fluid injection directions on phase-change materials melting in such systems, revealing that bottom HTF injection exhibits superior heat-transfer efficiency compared to top injection.
Article
Thermodynamics
Lokesh Kalapala, Jaya Krishna Devanuri
Summary: The study examined the performance of a shell and tube latent heat storage unit with annular fins attached to the tube. It was found that horizontal orientation requires significantly more time for complete melting compared to vertical orientation, due to the suppression of convective transport in the bottom half. Horizontal orientation exhibited higher energy efficiency, while vertical orientation showed higher exergy efficiency.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Changda Nie, Shengxiang Deng, Jiangwei Liu, Yunxiao Li
Summary: The study proposed the combination of full-fins and nanoparticles in gradient-concentration to improve the performance of latent heat storage systems using phase change materials. Experimental results demonstrate that the design of full-fins reduces melting time during the melting process, and when combined with multi-walled carbon nanotubes, it enhances melting uniformity and further shortens the complete melting time.
APPLIED THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Changda Nie, Shengxiang Deng, Jiangwei Liu, Zhonghao Rao
Summary: This study proposes a solution with hybrid fins and nanoparticles to address the nonuniform melting issue of PCM in the widely used vertical shell-tube storage unit, which significantly affects the thermal performance. By using half-fins and full-fins, nanoparticles are dispersed uniformly and non-uniformly in different regions of the storage unit. Numerical analysis reveals that using full-fins reduces heat runoff in the bottom region and increasing nanoparticles concentration enhances heat conduction. An optimized nanoparticles concentration of 3.5-2.0-6.5 vol% reduces melting time by 29.8% and improves melting rate uniformity by 94.0%.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Mohamed Boujelbene, Hayder I. Mohammed, Hasan Sh. Majdi, Roohollah Babaei-Mahani, Pouyan Talebizadehsardari, Alireza Rahbari
Summary: This study evaluates the melting behavior of nano-enhanced phase change materials (NePCM) in a triple-tube heat exchanger with a zigzag-shape channel configuration. By numerically simulating a zigzag tube with different angles and heights and comparing the results with a conventional triple-tube heat exchanger, the performance of the proposed geometry is assessed. Cu, CuO, Al2O3, and Ag nanoparticles are used to improve the thermal conductivity of NePCMs. The main finding is that using a middle zigzag tube significantly improves the melting performance of a triple-tube heat exchanger.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Green & Sustainable Science & Technology
Qianjun Mao, Xinlei Hu, Tao Li
Summary: A novel fin structure has been proposed for a shell-and-tube heat storage tank, and a heat transfer model has been established to study its performance. The results show that the novel fin structure can reduce the melting time of the phase change material, and the fin height and angle have significant effects on the melting time.
Article
Thermodynamics
Abdullah N. Olimat, Mohammad Ismail, Nabeel Abu Shaban, Ahmad AL-Salaymeh
Summary: The effects of pipe orientation angle on the performance of latent heat thermal energy storage systems were investigated. It was found that increasing the orientation angle of the pipe can reduce the melt fraction and increase the melting time and absorbed heat flux. However, the orientation angle has no impact on the solid fraction during solidification.
CASE STUDIES IN THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Devendra Raut, Saurabh Lanjewar, Vilas R. Kalamkar
Summary: This study investigates the effect of geometric and operating parameters on the charging of phase change material (PCM) in a vertical helical coiled latent heat storage (LHS) system. The results show that increasing the coil spacing and HTF inlet temperature can improve the charging process, while varying the HTF flow rate has no significant impact on the charging rate of the PCM.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Energy & Fuels
Fakhar ul Hasnain, Muhammad Irfan, Muhammad Mahabat Khan, Lehar Asip Khan, Hassan Farooq Ahmed
Summary: This study highlights the enhancement of PCM melting performance through the application of branched fins and nanoparticles. Different fin designs are found to significantly improve melting efficiency, while the addition of nanoparticles further reduces melting time. However, the additional nanoparticles decrease the energy storage capacity.
JOURNAL OF ENERGY STORAGE
(2021)
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
Energy & Fuels
Nidhal Ben Khedher, Jasim M. Mahdi, Anmar Dulaimi, Ilia Shojaeinasab Chatroudi, Mohammadreza Ebrahimnataj Tiji, Raed Khalid Ibrahem, A. Yvaz, Pouyan Talebizadehsardari
Summary: Phase-change materials (PCMs) have the potential to address the mismatch between energy supply and demand due to their energy savings, uniform operating temperature, and low cost. This study demonstrates the advantage of using arc-shaped fins as thermal enhancers to improve the thermal functionality of PCM in a storage system. Parametric studies show that modifying the dimensions and angles of the fin configuration can further enhance the heat storage rate.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Xuan Zhang, Chengbin Zhang, Yongping Chen
Summary: This study investigates the thermal management effectiveness of a heat pipe coupled with phase change material (PCM) based latent heat storage (LHS) system for high heat loads in electronic devices. Both experimental and theoretical analyses show that arranging PCM units at the evaporator section optimizes the system's performance under intermittent heat load conditions by stabilizing the heat source temperature and improving temperature uniformity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
Fangfei Li, Xinyu Huang, Yuanji Li, Liu Lu, Xiangzhao Meng, Xiaohu Yang, Bengt Sunden
Summary: In this study, the flip mechanism is applied to improve the characteristics of uneven melting in the melting process of the triplex-tube latent heat energy storage unit. Numerical simulation is used and verified by experimental data. The results show that a single flip can significantly improve the melting performance of the unit under different dimensionless times. However, the flip has a negative effect on the total heat absorption in one melting cycle. The addition of flip effectively reduces the negative influence of the hard-to-melt zone during the melting process.
Article
Energy & Fuels
Yubo Wang, Zhenhua Quan, Zihuan Xu, Yaohua Zhao, Zhaomeng Wang
Summary: This study proposes a novel solar-air complementary energy system to compensate for the low-temperature defects of the air source heat pump. The system utilizes water solidification process heat and photovoltaic waste heat or air energy for energy storage and supply. The results show that the system has high performance and heat collection efficiency, providing a reliable energy supply solution for cold regions.
Article
Energy & Fuels
Fakhar ul Hasnain, Muhammad Irfan, Muhammad Mahabat Khan
Summary: This study numerically investigates the performance enhancement of a concentric tube LHS unit using a fin structure and a fin-nanoparticles hybrid strategy. The results show that the double-branched fin design achieves the highest heat transfer enhancement, while adding 1% Al2O3 nanoparticles achieves the best balance between time saving and energy storage features.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Article
Thermodynamics
Hai Zhao, Puzhen Gao, Xiaochang Li, Ruifeng Tian, Hongyang Wei, Sichao Tan
Summary: This study numerically investigates the interaction between flow-induced vibration and forced convection heat transfer in a tube bundle. The results show that the impact of flow-induced vibration on heat transfer varies in different flow velocity regions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rohit Chintala, Jon Winkler, Sugirdhalakshmi Ramaraj, Xin Jin
Summary: The current state of fault detection and diagnosis for residential air-conditioning systems is expensive and not suitable for widespread implementation. This paper proposes a cost-effective solution by introducing an automated fault detection algorithm as a screening step before more expensive tests can be conducted. The algorithm uses home thermostats and local weather information to identify thermodynamic parameters and detect high-impact air-conditioning faults.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
A. Azimi, N. Basiri, M. Eslami
Summary: This paper presents a novel optimization algorithm for improving the water-film cooling system of photovoltaic panels, resulting in a significant increase in net energy generation.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Duc-Thuan Phung, Chin-Hsiang Cheng
Summary: In this study, a novel CFDMD model is used to analyze and investigate the behavior of thermal-lag engines (TLE). The study shows that the CFDMD model effectively captures the thermodynamic behavior of the working gas and the dynamic behavior of the engine mechanism. Additionally, the study explores the temporal evolution of engine speed and the influence of various parameters on shaft power and brake thermal efficiency. The research also reveals the existence of a thermal-lag phenomenon in TLE.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Haiying Yang, Yinjie Shen, Lin Li, Yichen Pan, Ping Yang
Summary: The purpose of this article is to find a measure to improve the interfacial thermal transfer of graphene/silicon heterojunction. Through molecular dynamics simulation, it is found that surface modification can significantly reduce the thermal resistance, thereby improving the thermal conductivity of the graphene/silicon interface.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Qiong Wu, Yancheng Wang, Haonan Zhou, Xingye Qiu, Deqing Mei
Summary: This article introduces a visible methanol steam reforming microreactor, which uses an optical crystal as an observation window and measures the reaction temperature in real-time using infrared thermography. The results show that under lower oxygen to carbon ratio conditions, the microreactor has a higher heating rate and a stable gradient in temperature distribution.
APPLIED THERMAL ENGINEERING
(2024)
Review
Thermodynamics
Giulia Manco, Umberto Tesio, Elisa Guelpa, Vittorio Verda
Summary: In the past decade, there has been a growing interest in studying energy systems for the combined management of power vectors. Most of the published works focus on finding the optimal design and operations of Multi Energy Systems (MES). However, for newcomers to this field, understanding how to achieve the desired optimization details while controlling computational expenses can be challenging and time-consuming. This paper presents a novel approach to analyzing the existing literature on MES, with the aim of guiding practical development of MES optimization. Through the discussion of six case studies, the authors provide a mathematical formulation as a reference for building the model and emphasize the impact of different aspects on the problem nature and solver selection. In addition, the paper also discusses the different approaches used in the literature for incorporating thermal networks and storage in the optimization of multi-energy systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xuepeng Yuan, Caiman Yan, Yunxian Huang, Yong Tang, Shiwei Zhang, Gong Chen
Summary: In this study, a multi-scale microgroove wick (MSMGW) was developed by laser irradiation, which demonstrated superior capillary performance. The surface morphology and performance of the wick were affected by laser scan pitch, laser power, repetition frequency, and scanning speed. The MSMGW showed optimal capillary performance in alumina material and DI water as the working fluid.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Maofei Mei, Feng Hu, Chong Han
Summary: This paper proposes an effective local search method based on detection of droplet boundaries for understanding the dynamic process of droplet growth during dropwise condensation. The method is validated by comparing with experimental data. The present simulation provides an effective approach to more accurately predict the nucleation site density in future studies.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Rahul Kumar Sharma, Ashish Kumar, Dibakar Rakshit
Summary: The study explores the use of phase change materials (PCM) as a retrofit with Heating Ventilation and Air-conditioning systems (HVAC) to reduce energy consumption and improve air quality. By incorporating PCM with specific thickness and fin configurations, significant energy savings can be achieved in comparison to standard HVAC systems utilizing R134a. This research provides policymakers with energy-efficient and sustainable solutions for HVAC systems to combat climate change.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Zhenhua Ren, Xiangjin Meng, Xingang Qi, Hui Jin, Yunan Chen, Bin Chen, Liejin Guo
Summary: This paper investigates the heat transfer mechanism and factors influencing thermal radiation in the process of supercritical water gasification (SCWG) of coal, and proposes a comprehensive numerical model to simulate the process. Experimental validation results show that thermal radiation accounts for a significant proportion of the total heat exchange in the reactor and a large amount of radiant energy exists in the important spectral range of supercritical water. Enhancing radiative heat transfer can effectively increase the temperature of the reaction medium and the gasification rate.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Mauro Abela, Mauro Mameli, Sauro Filippeschi, Brent S. Taft
Summary: Pulsating Heat Pipes (PHP) are passive two-phase heat transfer devices with a simple structure and high heat transfer capabilities. The actual unpredictability of their dynamic behavior during startup and thermal crisis hinders their large-scale application. An experimental apparatus is designed to investigate these phenomena systematically. The results show that increasing the number of evaporator sections and condenser temperature improves the performance of PHP. The condenser temperature also affects the initial liquid phase distribution and startup time.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Ke Gan, Ruilian Li, Yi Zheng, Hui Xu, Ying Gao, Jiajie Qian, Ziming Wei, Bin Kong, Hong Zhang
Summary: A 3-dimensional enhanced heat pipe radiator has been developed to improve heat dissipation and temperature uniformity in cooling high-power electronic components. Experimental results show that the radiator has superior heat transfer performance compared to a conventional aluminum fin radiator under different heating powers and wind speed conditions.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xinyi Zhang, Shuzhong Wang, Daihui Jiang, Zhiqiang Wu
Summary: This study focuses on recovering waste heat from blast furnace slag using dry centrifugal pelletizing technology. A comprehensive two-dimensional model was developed to analyze heat transfer dynamics and investigate factors influencing heat exchange efficiency. The findings have important implications for optimizing waste heat recovery and ensuring safe operations.
APPLIED THERMAL ENGINEERING
(2024)
Article
Thermodynamics
Xincheng Wu, An Zou, Qiang Zhang, Zhaoguang Wang
Summary: The boosting heat generation rate of high-performance processors is challenging traditional cooling techniques. This study proposes a combined design of active jet intermittency and passive surface modification to enhance heat transfer.
APPLIED THERMAL ENGINEERING
(2024)