Article
Thermodynamics
Gao Shu, Tian Xiao, Junfei Guo, Pan Wei, Xiaohu Yang, Ya-Ling He
Summary: Solar energy provides an alternative solution to building energy utilization, addressing the issues of energy conservation and emission reduction. To overcome the fluctuation in energy supply, a latent heat phase change module is designed. Experimental studies on the effects of heating and cooling temperatures on thermal cycles provide guidance for the design of passive building energy utilization.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Chunlei Wu, Qing Wang, Shipeng Sun, Xinmin Wang, Da Cui, Shuo Pan, Hongyu Sheng
Summary: In this study, NaCl-KCl-NaF/nanoparticles composite phase change materials (CPCMs) were used to improve thermal conductivity and energy density in high-temperature thermal energy storage systems. The addition of CuO and Al2O3 nanoparticles resulted in a significant enhancement in thermal properties and a reduction in cost per unit of energy density. The CPCMs exhibited excellent operating temperature range and thermal stability.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Thermodynamics
Guoqiang Wu, Sheng Chen, Sibo Zeng
Summary: Mechanical vibration can enhance heat transfer of thermal systems, with factors such as frequency and orientation affecting melting processes. Low frequency vibration accelerates melting, while higher frequency has a weaker acceleration effect. Vibration axis parallel to gravity results in the fastest thermal response rate.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Julian Weimer, Nicolas Weimer, Jeremy Nuzzo, Ingmar Kallfass
Summary: A transient thermal management system is proposed to enhance the power density of mobile battery charger by dynamically adjusting converter output power. Experimental results show a 40% increase in effective power density when charging a conventional 50 Wh laptop battery, all within the same thermal boundaries as common operation at constant output power, with a power density measurement accuracy of 5.2%.
APPLIED THERMAL ENGINEERING
(2023)
Article
Thermodynamics
Javid Zamani, Ali Keshavarz
Summary: Nowadays, the world is facing an energy crisis, with residential buildings in developed countries accounting for a significant portion of global energy demand. To achieve sustainable energy systems, it is crucial to reduce energy consumption in this sector. The use of phase change materials (PCMs) in energy systems is identified as one of the feasible solutions. This study focuses on investigating the application of PCMs in a dual-pipe latent heat exchanger system for thermal energy storage, with the aim of optimizing the charging and discharging operations to enhance energy efficiency and minimize exergy destruction.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2023)
Article
Energy & Fuels
Satilmis Tekin, Goker Turkakar
Summary: Placing batteries in PCM-filled containers leads to a thermal imbalance in the pack, but a proposed alternative geometry can solve this issue. The experimentally tested battery pack structure utilizes PCM and consists of 12 LiFePO4 batteries in an aluminum chamber with customized fins. Different PCMs with varying melting temperatures are studied, and the effect on battery pack temperature is observed. The tailor-made finned geometry helps maintain a homogeneous temperature in the cells, ensuring the maximum temperature difference inside the battery pack stays below 5 degrees C.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Thermodynamics
Allan T. Muzhanje, Hamdy Hassan
Summary: In this study, the application of free cooling using thermal energy storage was investigated by studying the cooling effect of encapsulated phase change material (PCM) on air. The study analyzed the impact of different encapsulation geometries and nanoparticle enhancements on the solidification and melting cycles of PCM. A mathematical model for heat transfer over the encapsulation was developed and solved using Ansys 20.2 software. The results showed that rectangular-shaped PCM encapsulation with CuO nanoparticle enhancement had the shortest solidification and melting times. It was also recommended to use either sp24 or sp26 PCMs mixed with nano-alumina and encapsulated in rectangular containers for free cooling applications.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2023)
Article
Thermodynamics
Yongxue Zhang, Bohui Lu, Zixi Wang, Jianjun Zhu, Jinya Zhang, Cong Wang
Summary: This study designs a snowflake fin for latent heat thermal energy storage (LHTES) technology and experimentally demonstrates that the snowflake fin design can significantly reduce the melting and solidification time of the LHTES unit compared to the traditional longitudinal fin design. It is also found to be more beneficial for the discharging process.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
Pouyan Talebizadehsardari, Jasim M. Mahdi, Hayder Mohammed, M. A. Moghimi, Amir Hossein Eisapour, Mohammad Ghalambaz
Summary: The study investigates the modification of PCM storage functionality in a plate type heat exchanger with zigzag configuration, finding that increasing the zigzag angle has a minimal impact initially but leads to faster storage/retrieval rates over time. The system with a 60-degree zigzag angle enhances storage rate by 32.6% compared to a 30-degree system. Higher HTF temperature and/or higher Reynold number result in faster phase-transition rates during both parts of the energy charging-discharging cycle.
APPLIED THERMAL ENGINEERING
(2021)
Article
Physics, Multidisciplinary
Kai Xu, Han-Jie Zhu, Hao Zhu, Guo-Feng Zhang, Wu-Ming Liu
Summary: Improving the charging and self-discharging processes is crucial for achieving high-performance quantum batteries. This study investigates the effects of composite environments on the charging and self-discharging processes of a quantum battery. The results show that increasing two-mode coupling enhances charging performance and suppresses self-discharging, while the memory effect of the reservoir in the composite environment is found to be unfavorable to the charging process. These findings have implications for the development of high-performance quantum batteries in complex environmental noise.
FRONTIERS OF PHYSICS
(2023)
Article
Energy & Fuels
Sare Mitincik, Mustafa Yusuf Yazici
Summary: This study investigates the thermal performance of a graphite matrix composite with phase change in a shell-in-tube geometry for solar energy and waste heat recovery applications. The results show that the composite has remarkable potential for thermal energy storage, with an optimal bulk density value of 100 kg/m3. Higher or lower bulk densities have minimal impact on the storage performance.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Weimin Guo, Zhaoyu He, Ashmore Mawire, Peng Zhang
Summary: The study investigates the performance of a packed bed thermal energy storage (PBTES) system with cascaded phase change material (PCM) for waste heat recovery. A concentric dispersion model is developed and validated, finding that the volumetric ratio of hydroquinone: adipic acid: erythritol = 3:6:1 is the best configuration for the cyclic charging and discharging processes. The cascaded PBTES system achieves higher heat transfer rate compared to non-cascaded system, with an increase of 6.96% in average heat transfer rate for the volumetric ratio of 3:6:1.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Bohui Lu, Yongxue Zhang, Zhihao Wang, Jianjun Zhu, Jinya Zhang, Dong Sun
Summary: This paper experimentally investigates the effect of shell shape on vertical latent heat thermal energy storage (LHTES) unit. The results show that conical LHTES units can provide a better temperature field uniformity and enhance the heat transfer rate between heat transfer fluid (HTF) and phase change material (PCM).
JOURNAL OF ENERGY STORAGE
(2022)
Article
Thermodynamics
Qianqian Xin, Jinsheng Xiao, Tianqi Yang, Hengyun Zhang, Xi Long
Summary: A hybrid cooling system composed of composite phase change material and counterflow liquid cooling is designed to improve the thermal performance of lithium-ion batteries under high ambient temperatures and high discharge rates. The study investigates the effects of different parameters, such as composite phase change material thicknesses, coolant flow directions, expanded graphite mass fractions, coolant velocities, and coolant temperatures, on the maximum temperature and temperature uniformity of the battery module. The results show that the hybrid cooling configuration can handle rapid discharging even under a high ambient environment and effectively improve the thermal safety of batteries.
APPLIED THERMAL ENGINEERING
(2022)
Article
Energy & Fuels
Seyedmohsen Baghaei Oskouei, Ozgur Bayer
Summary: A novel method is proposed to overcome the low thermal conductivity issue of phase change materials (PCMs) in horizontal latent thermal energy storage (LTES) systems. By designing bypassing tubes that redirect the flow of heat transfer fluid to the slowest melting area, the charging time is reduced. The effect of parameters like the lengths, radial distance, and mass flow rate ratio of the bypassing tubes on the charging rate, charging efficiency, and heat transfer is investigated.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Energy & Fuels
Yafang Zhang, Juhua Huang, Ming Cao, Guoping Du, Ziqiang Liu, Wang Li
Summary: The study found that h-BN/SR composite materials have improved thermal conductivity and mechanical properties, which can effectively enhance the safety performance of batteries.