Article
Thermodynamics
Shahin Faghiri, Rouhollah Ahmadi, Shahin Akbari, Mohammad Behshad Shafii
Summary: This study uses a reliable 3D numerical simulation to investigate the charging process of paraffin as the phase change material in a double spirally coiled tube heat exchanger with two separated paths. The effects of operational and geometrical factors on the behavior of the latent thermal energy storage system during the melting process are analyzed. The results show that reducing the radius of the inner spiral tube decreases the melting capability of PCM at the beginning of the charging process but improves efficiency at later stages. The overall time required for 95 wt% PCM melting in the storage decreases by 126% when the radius of the inner spiral tube is reduced from 90 mm to 50 mm.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Green & Sustainable Science & Technology
Juan Duan, Zeyu Peng
Summary: In the annular tube with spiral fins, adding nanoparticles to phase change material (nano-PCM) can greatly enhance energy storage efficiency. The study investigates the energy storage process and enhancement rate of nano-PCM in the annular tube with spiral fins, and finds that adding graphene to PCM leads to a sixfold increase in melting rate compared to adding Al2O3. Adding 1% graphene significantly enhances the energy storage process.
Article
Construction & Building Technology
Chen Shi, Qing Zhao, Ping Wang, Liu Yang
Summary: This paper investigates the application parameters and performance of composite phase change materials (CPCM) in construction. The CPCM was prepared using paraffin/expanded graphite (EG) and applied to phase change gypsum board (PCGB). The experimental results show that PCGB has excellent thermal conductivity and latent heat, and it can effectively reduce the cooling and heating load of the wall, saving energy.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Green & Sustainable Science & Technology
Babak Karami, Neda Azimi, Shahin Ahmadi
Summary: This study utilized a composite PCM of paraffin with beef tallow/coconut oil mixture to enhance heat removal from a PV module surface. By adding expanded graphite powders to the composite, optimal parameters were determined to improve thermal conductivity and increase output power for the PV system. The results demonstrated that the composite with the specified composition was more efficient in heat regulation, while the addition of EG particles provided significant added benefits.
Article
Energy & Fuels
Mansoor Shademan, Alireza Hossein Nezhad
Summary: The study numerically analyzed the performance of an energy storage system containing phase change materials under different conditions, showing that applying coupled boundary condition is crucial for reducing errors during the charging process.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
C. Ahamed Saleel
Summary: This numerical study investigates the early-stage heat transfer and melting process of phase change materials (PCM) in a square enclosure using a finite volume-based software. The results show significant differences between pure paraffin and paraffin with SiC nanoparticles in the early melting stages. The addition of SiC nanoparticles enhances convective heat transfer rate, but has a contrary effect on temperature distribution and heat transfer characteristics.
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
(2022)
Article
Chemistry, Multidisciplinary
Thiago Santos, Luiz C. Wrobel, Nick Hopper, Maria Kolokotroni
Summary: The heat transfer between encapsulated PCM panels and air in PCM-Air heat exchangers was studied, leading to the development of a new encapsulation panel design. Through simulations and laboratory testing, it was found that the new design significantly improved heat transfer efficiency, increased material capacity, and allowed the fan to overcome the increased pressure drop.
APPLIED SCIENCES-BASEL
(2021)
Article
Thermodynamics
Bohui Lu, Yongxue Zhang, Dong Sun, Zhiyi Yuan, Shengqi Yang
Summary: The study investigated the thermal performance of a LHTES unit using PCM and HTF, finding that natural convection of melted PCM significantly impacts phase-change rate, while increasing inlet HTF temperature and flow rate during charging can improve heat transfer and shorten total charging time.
APPLIED THERMAL ENGINEERING
(2021)
Article
Thermodynamics
Mateo Kirincic, Anica Trp, Kristian Lenic, Fran Torbarina
Summary: In this paper, heat transfer during the charging and discharging processes in a longitudinally finned vertical shell-and-tube latent thermal energy storage system (LTES) was numerically analyzed. The effects of LTES geometry parameters on the system thermal performance were evaluated and the numerical results were validated with experimental measurements. The obtained results provide practical guidelines for the design of LTES systems.
APPLIED THERMAL ENGINEERING
(2024)
Article
Energy & Fuels
Seyed Soheil Mousavi Ajarostaghi, Sebastien Poncet, Kurosh Sedighi, Leyla Amiri
Summary: Rapid economic growth has caused energy resource shortages in developing countries. Thermal energy storage, particularly ice storage systems, can be used to decrease net energy usage. A combined experimental and numerical study was conducted on a novel ice-on-coil cold storage system. Initial experiments revealed non-uniform ice formation on the coil tube, which posed a challenge. Inserting baffles in the evaporator improved heat transfer rates and ice production but did not eliminate non-uniformity. Using a modified evaporator with four horizontal-placed coils increased ice thickness, especially at the bottom of the coil. Three-dimensional simulations based on the finite volume method were used to model the solidification process and validate the experimental results.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Engineering, Multidisciplinary
Mao QianJun, Cao Yan, Li Tao
Summary: This study experimentally researched and compared the thermal behavior of two thermal storage units using different heat transfer tubes. The results showed that using a spiral tube as the heat transfer tube can increase the energy storage efficiency of PCMs and shorten the melting time.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2023)
Article
Thermodynamics
Mustafa S. Mahdi, Hameed B. Mahood, Ahmed A. Alammar, Anees A. Khadom
Summary: The numerical study on enhancing the melting thermal characteristics of lauric acid as a phase change material using different heat transfer fluid tube arrangements showed that the arc array and downward triangle configurations significantly reduced melting time, while the upward triangle tube arrangements increased it.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2021)
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
Construction & Building Technology
Anurag Roy, Aritra Ghosh, Tapas K. Mallick, Asif Ali Tahir
Summary: This study introduces a paraffin-incorporated SnO2-Al2O3 composite coating, which exhibits intelligent cooling behavior and contributes to energy conservation while maintaining indoor thermal comfort.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Energy & Fuels
Mohammed J. Alshukri, Adel A. Eidan, Saleh Ismail Najim
Summary: The research investigates the enhancement of a heat pipe evacuated tube collector with nano or micro-enhanced phase change materials, which improves the efficiency of solar water heaters and reduces temperature fluctuations in hot water. The integration of enhanced-paraffin wax with NP-CuO and MP-ZnO showed significant efficiency improvements in both the evacuated tubes and separate storage tanks.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Thermodynamics
Pengcheng Zhao, Jingang Wang, Liming Sun, Yun Li, Haiting Xia, Wei He
Summary: The production of green hydrogen through water electrolysis is crucial for renewable energy utilization and decarbonization. This research explores the optimal electrode configuration and system design of compactly-assembled industrial electrolyzer. The findings provide valuable insights for industrial application of water electrolysis equipment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
V. Baiju, P. Abhishek, S. Harikrishnan
Summary: Thermally driven adsorption desalination systems (ADS) have gained attention as an eco-friendly solution for water scarcity. However, they face challenges related to low water productivity and scalability. To overcome these challenges, integrating ADS with other desalination technologies can create a small-scale hybrid system. This study proposes integrating ADS with a Thermo Electric Dehumidification (TED) unit to enhance its performance.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
C. X. He, Y. H. Liu, X. Y. Huang, S. B. Wan, Q. Chen, J. Sun, T. S. Zhao
Summary: A decentralized centroid multi-path RC network model is constructed to improve the temperature prediction accuracy compared to traditional RC models. By incorporating multiple heat flow paths and decentralizing thermal capacity, a more accurate prediction is achieved.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chaoying Li, Meng Wang, Nana Li, Di Gu, Chao Yan, Dandan Yuan, Hong Jiang, Baohui Wang, Xirui Wang
Summary: There is an urgent need to shift away from heavy dependence on fossil fuels and embrace renewable energy sources, particularly in the energy-intensive oil refining process. This study presents an innovative concept called the Solar Oil Refinery, which applies solar energy in oil refining. A solar multi-energies-driven hybrid chemical oil refining system that utilizes solar pyrolysis and electrolysis has been developed, significantly improving solar utilization efficiency, cracking rate, and hydrogen yield.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Chao Ma, Guanghui Wang, Dingbiao Wang, Xu Peng, Yushen Yang, Xinxin Liu, Chongrui Yang, Jiaheng Chen
Summary: This study proposes a bio-inspired fish-tail wind rotor to improve the wind power efficiency of the traditional Savonius rotor. Through transient simulations and orthogonal experiments, the key factors affecting the performance are identified. A response surface model is constructed to optimize the power coefficient, resulting in an improvement of 9.4% and 6.6% compared to the Savonius rotor.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sina Bahmanziari, Abbas-Ali Zamani
Summary: This paper proposes a new framework for improving electrical energy harvesting from piezoelectric smart tiles through a combination of magnetic plucking, mechanical impact, and mechanical vibration force mechanisms. Experimental results demonstrate a significant increase in energy yield and average energy harvesting time compared to other mechanisms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Nanjiang Dong, Tao Zhang, Rui Wang
Summary: This study establishes a multiobjective mixed-variable configuration optimization model for a comprehensive combined cooling, heating, and power energy system, and proposes an efficient generating operator to optimize this model. The experimental results show that the proposed algorithm performs better than other state-of-the-art algorithms.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Ahmed E. Mansy, Eman A. El Desouky, Tarek H. Taha, M. A. Abu-Saied, Hamada El-Gendi, Ranya A. Amer, Zhen-Yu Tian
Summary: This study aims to convert office paper waste into bioethanol through a sustainable pathway. The results show that physiochemical and enzymatic hydrolysis of the waste can yield a high glucose concentration. The optimal conditions were determined using the Box-Behnken design, and a blended membrane was used for ethanol purification.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Sven Klute, Marcus Budt, Mathias van Beek, Christian Doetsch
Summary: Heat pumps are crucial for decarbonizing heat supply, and steam generating heat pumps have the potential to decarbonize the industrial sector. This paper presents the current state, technical and economic data, and modeling principles of steam generating heat pumps.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Le Zhang, To-Hung Tsui, Yen Wah Tong, Pruk Aggarangsi, Ronghou Liu
Summary: This study investigates the effectiveness of a current-carrying-coil-based magnetic field in promoting anaerobic digestion of chicken manure. The results show that the applied magnetic field increases methane yield, decreases carbon dioxide production, and reduces the concentration of ammonia nitrogen. Microbial community analysis reveals the enrichment of certain methanogenic genera and enhanced metabolic pathways. Pilot-scale experiments confirm the technical effectiveness of the magnetic field assistance in enhancing anaerobic digestion of chicken manure.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Bo Chen, Ruiqing Ma, Yang Zhou, Rui Ma, Wentao Jiang, Fan Yang
Summary: This paper presents an advanced energy management strategy for fuel cell hybrid electric heavy-duty vehicles, focusing on speed planning and energy allocation. By utilizing predictive co-optimization control, this strategy ensures safe inter-vehicle distance and minimizes energy demand. Simulation results demonstrate the effectiveness of the proposed method in reducing fuel cell degradation cost and overall operation cost.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Fabio Fatigati, Roberto Cipollone
Summary: Organic Rankine Cycle-based microcogeneration systems that use solar sources to generate electricity and hot water can help reduce CO2 emissions in residential energy-intensive sectors. The adoption of a recuperative heat exchanger in these systems improves efficiency, reduces thermal power requirements, and saves on electricity costs.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Lipeng He, Renwen Liu, Xuejin Liu, Xiaotian Zheng, Limin Zhang, Jieqiong Lin
Summary: This research proposes a piezoelectric-electromagnetic hybrid energy harvester (PEHEH) for low-frequency wave motion and self-sensing wave environment monitoring. The PEHEH shows promising power output and the ability to self-power and self-sense the wave environment.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Shangling Chu, Yang Liu, Zipeng Xu, Heng Zhang, Haiping Chen, Dan Gao
Summary: This paper studies a distributed energy system integrated with solar and natural gas, analyzes the impact of different parameters on its energy utilization and emissions reduction, and obtains the optimal solution through an optimization algorithm. The results show that compared to traditional separation production systems, this integrated system achieves higher energy utilization and greater reduction in carbon emissions.
ENERGY CONVERSION AND MANAGEMENT
(2024)
Article
Thermodynamics
Qingpu Li, Yaqi Ding, Guangming Chen, Yongmei Xuan, Neng Gao, Nian Li, Xinyue Hao
Summary: This paper proposes and studies a piston-type thermally-driven pump with a structure similar to a linear compressor, aiming to eliminate the high-quality energy consumption of existing pumps and replace mechanical pumps. The coupling mechanism of working fluid flow and element dimension is analyzed based on force analysis, and experimental data analysis is used to determine the pump operation stroke. Theoretical simulation is conducted to analyze the correlation mechanism of the piston assembly. The research shows that the thermally-driven pump can greatly reduce power consumption and has potential for industrial applications.
ENERGY CONVERSION AND MANAGEMENT
(2024)