Article
Thermodynamics
Anqi Chen, Fan Jiang, Jiajia Dong, Jeffrey Chen, Yuan Zhu
Summary: A novel ultra-thin loop heat pipe (UT-LHP) with capillary wick structures is developed for cooling mobile electronics. By using a novel print wick structuring process on copper substrates, the total thickness of the UT-LHP can be decreased to only 0.3 mm. The heat transfer performance has been evaluated under different heat loads and configurations, showing a minimal thermal resistance of 1.03 degrees C /W at a heat load of 3 W.
APPLIED THERMAL ENGINEERING
(2022)
Article
Thermodynamics
Noriyuki Watanabe, Takuji Mizutani, Hosei Nagano
Summary: A miniature loop heat pipe (mLHP) has been developed for cooling compact wide bandgap power semiconductors with high heat flux and high allowable operating temperature. The mLHP, consisting of an evaporator, a condenser, and transport tubes, can achieve excellent heat transfer performance using specific materials and cooling methods. The proposed steady-state numerical model is consistent with experimental results, with a relative error of 7%.
ENERGY CONVERSION AND MANAGEMENT
(2021)
Article
Thermodynamics
Sai Kiran Hota, Kuan-Lin Lee, Brett Leitherer, George Elias, Greg Hoeschele, Srujan Rokkam
Summary: Two-phase-based heat spreaders are highly sought after for electronics cooling due to their superior thermal performance. Pulsating Heat Pipes (PHPs) offer thickness, shape, and cost advantages over Embedded Heat Pipe (EHP) spreaders. The thermal performance of PHP with different fluids was experimentally determined and compared to EHP. A mathematical model was developed and validated. Propylene-filled PHP performs similarly or better than EHP at low sink temperatures but dries out faster at moderate temperatures. PHP with R245fa and acetone improves with increasing power but has lower thermal conductivity compared to EHP. PHP is lighter than EHP based on weight comparison.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Multidisciplinary Sciences
Muhammad Sajid Kamran, Kashifa Naz, Jamal Umer, Muhammad Sajjad, Muhammad Wajid Saleem, Mudather Ibrahim Mudather Zeinelabdeen
Summary: This paper presents the design, development, and experimental investigation of a fast responding and passive heat-rejecting copper-water-based miniature loop heat pipe (mLHP). Results show a decrease in thermal resistance, an increase in heat transfer coefficient for evaporation, and the system's ability to efficiently dissipate heat in electronic devices.
ARABIAN JOURNAL FOR SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Chemical
Bing Cai, Weizhong Deng, Tong Wu, Tingting Wang, Zhengyuan Ma, Wei Liu, Lei Ma, Zhichun Liu
Summary: This study explores the influence of using a pouring silicate wick on the production and performance of loop heat pipes. The results show that the system can operate stably, adapt well to changes in heat load, and have good heat load matching capabilities.
Article
Thermodynamics
Ji Li, Xingping Li, Guohui Zhou, Yang Liu
Summary: The study developed a super-large aluminum-based flat heat pipe heat spreader that effectively manages thermal loads up to 80 W, and combined it with a finned heat sink to test its heat dissipation capability under natural convection conditions.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Kelvin G. Domiciano, Larissa Krambeck, Juan Pablo M. Florez, Marcia B. H. Mantelli
Summary: Diffusion bonding process was used to manufacture thin flat loop heat pipes for thin electronics cooling applications. Experimental and theoretical analysis showed that reducing the thickness of the heat pipes decreased their thermal performance, with thinner pipes exhibiting higher heat leakages. Despite this, the proposed loop heat pipes have potential for effective thermal management of thin electronic devices.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Article
Chemistry, Multidisciplinary
Maria Polacikova, Patrik Nemec, Milan Malcho, Jozef Jandacka
Summary: This paper presents experimental research on a passive cooling system based on a loop gravity heat pipe, which is designed to cool electrical cabinets. The system operates automatically by changing the working substance's state, thus saving energy consumption. The aim of the research is to determine the limit performance parameters of the refrigeration system through experiments and reduce heat loss inside the cabinet. The results demonstrate that the cooling device can ensure temperature conditions inside the electrical enclosure under different heat loads.
APPLIED SCIENCES-BASEL
(2022)
Article
Materials Science, Multidisciplinary
Dongdong Yuan, Jiajia Chen, Yong Yang, Liyong Zhang, Songyan Liu, Huafei Jiang, Ning Qian
Summary: This study investigated the application of a new type of thin heat pipe heat sink in SSD cooling systems, showing that double THPs at a 90-degree angle have superior heat transfer performance. The research is significant for the design and optimization of SSD cooling systems.
Article
Thermodynamics
Kangning Xiong, Like Meng, Shuangfeng Wang, L. Winston Zhang
Summary: A novel flat evaporator loop heat pipe (LHP) has been designed to operate normally in specific positive gravity directions and demonstrate good thermal performance. The orientation of the LHP has a significant impact on the junction temperature and thermal performance.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Energy & Fuels
S. R. Akhil Krishnan, Suresh Sivan, V. C. Midhun, Soumya Ranjan Behera
Summary: Advancements in PCM technology provide adaptable solutions for high heat dissipation in electronic devices. This study investigates the influence of NPG as a solid-solid phase transition PCM on the functionality of a heat pipe-assisted heat sink. Experimental and numerical analysis shows that the integration of PCM and heat pipe in the heat sink outperforms other configurations, with a maximum enhancement ratio of 3.29. The heat sink assembly with 99% PCM and heat pipe demonstrates the most significant results, while the assembly without heat pipe performs best for 66% PCM.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Gao Xintian, Chen Anqi, Zhu Yuan, Lyu You, Guo Wei, Zhou Shaoxin
Summary: This work introduces a solution to the performance degradation problem caused by miniaturization, where the surface wettability gradient significantly improves heat transfer performance in loop heat pipes. The study provides numerical experimental data comparing LHPs with and without the SWG, showing that the SWG leads to shorter start-up time and reduced thermal resistance.
JOURNAL OF THERMAL SCIENCE
(2021)
Article
Energy & Fuels
Xianling Wang, Jingxuan Yang, Qiaowei Wen, Samson Shittu, Guangming Liu, Zining Qiu, Xudong Zhao, Zhangyuan Wang
Summary: A novel flat confined loop heat pipe (FCLHP) was proposed to alleviate the 'dry-out' phenomenon of evaporators with microchannels by providing an open flow space over the microchannel top surface. Experimental results showed that FCLHP could start up most quickly and reduce operating temperature by 10% at most under suitable cooling water temperature and flow rate, with lower thermal resistance and reduced temperature fluctuation.
Article
Energy & Fuels
Xianling Wang, Jingxuan Yang, Qiaowei Wen, Samson Shittu, Guangming Liu, Zining Qiu, Xudong Zhao, Zhangyuan Wang
Summary: In this study, a novel flat confined loop heat pipe (FCLHP) was proposed to address the dry-out phenomenon of evaporators with microchannels and fulfill the thermal management requirements of electronic devices. The results showed that the FCLHP could operate effectively under specific conditions, reducing temperature fluctuations and thermal resistance.
Article
Thermodynamics
Weijian Chen, Jiachen Huang, Hui Ma, Hongbo Zhan, Penglei Zhang
Summary: The integrated cooling system effectively handles various heat loads and ambient temperatures by switching between different modes, improving energy efficiency and ensuring safety.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
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)