Article
Chemistry, Physical
Satyaki Chandra, Pratibha Sharma, P. Muthukumar, Sankara Sarma Tatiparti
Summary: The hydrogen sorption characteristics of a 5 kg-LaNi5 reactor with conical fins and heat transfer tubes were experimentally studied. The results showed that higher water flow rates, lower inlet temperatures, and higher hydrogen pressures could result in faster absorption. Additionally, higher temperatures and water flow rates also increased the driving force for atmospheric desorption.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Zhihong Wu, Zhigang Guo, Jian Yang, Qiuwang Wang
Summary: In this study, the effects of different pitch of internal helical heat fins on methane steam reforming in a packed bed reactor were investigated. It was found that larger pitch increased the outlet mass flow and velocity disturbance by 9.5% and 382.3% respectively, but also brought higher flow resistance. The internal helical heat fins improved the fluid temperature and reduced the thermal resistance, with a temperature increase of 19.2 K and a thermal resistance decrease of 43.1% compared to the normal packed bed. The highest efficiency was achieved when the pitch was 120 mm, with an increase of 42.3%. Although the internal helical heat fins increased the reactor cost due to structural complexity, the total cost decreased. The lowest total cost was achieved when the pitch was 120 mm, with a decrease of 24.6% to about 1.6 USD/kg.
Article
Energy & Fuels
Mahvash Afzal, Nitin Sharma, Nandlal Gupta, Pratibha Sharma
Summary: In this study, a 50 kg LaNi5 based shell and tube type metal hydride hydrogen storage reactor was investigated. The design process for the reactor was presented and its performance analysis was carried out numerically. The study found that the reactor performance was promising under the appropriate operating conditions, with the supply pressure and heat transfer fluid flow rate having little effect on the performance, and the initial bed temperature having no significant impact.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Green & Sustainable Science & Technology
Yang Ye, Yi Yue, Jianfeng Lu, Jing Ding, Weilong Wang, Jinyue Yan
Summary: This paper proposes a novel hydrogen storage reactor design using metal hydride materials, phase change materials, and a heat exchanger to enhance heat transfer efficiency and hydrogen storage performance; the results show that effective thermal conductivity plays a key role in improving heat transfer and reaction rates, and increasing hydrogen supply pressure can effectively accelerate hydrogen absorption rates.
Article
Thermodynamics
A. Broatch, J. Garcia-Tiscar, A. Felgueroso, M. Chavez-Modena, L. M. Gonzalez, E. Valero
Summary: The implementation of Surface Air-Cooled Oil Coolers (SACOCs) in new generation turbofans is increasing due to the need for improving engine thermal management. Rounding the sharp edges of the heat exchanger can enhance heat exchange and reduce the aerodynamic impact of the fins.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Chemistry, Physical
Xueqiang Zhang, Xiangguo Zhang, Cheng Bao, Nien-Chu Lai
Summary: This study applies the field synergy principle to understand the chemically reactive flow in a CO-SMET tubular reactor. The variation in CO conversion rate under different operating conditions is found to be relevant to the synergy angle between temperature and gas concentration fields. The sensitive analysis of various factors provides insights into the profile of the field synergy angle within the temperature range of 373 K - 873 K. The study reveals that a synergy angle between 0° and 70° enhances heat transfer and contributes to higher CO conversion.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Chemistry, Physical
Busra Arslan, Mustafa Ilbas, Selahattin Celik
Summary: Energy storage, especially thermal energy storage using phase change materials (PCMs), is crucial for efficient energy utilization. This study investigates the use of PCM in a metal hydride (MH) reactor to store and recover heat during hydrogen charge and discharge processes. Experiments were conducted on a LaNi5-H2 reactor with and without PCM, and the effects of hydrogen storage pressure and reactor design on the charge-discharge rate were determined. The results show that designing a hybrid MH-PCM storage system holds promise for the advancement of hydrogen storage and transportation technologies, particularly in vehicles like automobiles and submarines.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Nuclear Science & Technology
Zhi Chen, Yu Ji, Hongna Zhang, Liqi Guo, Lixia Chen, Xiaobin Li, Fengchen Li
Summary: In this study, a new type of high-temperature gas-cooled reactor using hydrogen as a coolant was designed, and numerical simulations were performed to investigate the flow and heat transfer conditions in the core under various working conditions. The results showed that under high velocity inlet and low temperature inlet conditions, the system exhibited a high heat transfer rate. Interesting relationships were observed between the flow and heat transfer characteristics of the model through the Reynolds number (Re), n, and Tr.
NUCLEAR ENGINEERING AND DESIGN
(2023)
Article
Engineering, Chemical
Mohamed Elmously, Johannes Neidel, Andreas Apfelbacher, Robert Daschner, Andreas Hornung
Summary: The study aims to scale up the TCR technology from laboratory to pilot unit and investigates the effects of different scales of TCR system on temperature distribution through CFD simulation. The results show that the CFD model can predict heat distribution and flow velocities effectively with small deviations from experimental data.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2021)
Article
Energy & Fuels
Changwei Ji, Xionghui Huang, Zhengyu Yang, Jinxin Yang, Shuofeng Wang
Summary: This study focuses on the implementation of the coupled 1D-3D model to improve the performance of Wankel rotary engines (WREs) using ECFs. The results show that radial-fins have a significant effect on improving the engine performance, especially for hydrogen-enriched WREs.
Article
Thermodynamics
Yin Zhang, Kailun Guo, Chenglong Wang, Simiao Tang, Dalin Zhang, Wenxi Tian, G. H. Su, Suizheng Qiu
Summary: This research successfully designs and simulates a segmented thermoelectric generator (STEG) for heat pipe reactors. By conducting numerical simulations under steady-state conditions, the optimal geometry of the STEG is determined and its performance is explored further.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
H. Chang, Y. B. Tao, W. Y. Wang
Summary: Metal hydride (MH) is an efficient method for hydrogen storage. The use of spiral fins in MH reactors improves hydrogen storage efficiency by enhancing heat transfer characteristics. The performance of MH reactors with different fin structures was discussed, and it was found that reactors with spiral fins outperformed those with longitudinal fins. Optimizing the fin parameters can further enhance the reactor's performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Engineering, Electrical & Electronic
Shiqi Wang, Rong Xie, Jiali Liu, Pu Zhao, Haitao Liu, Xiaofang Wang
Summary: Supercritical water gasification is a promising clean coal technology that converts coal into a hydrogen-rich gas product without net carbon dioxide emissions and pollutant emissions. The effects of supercritical water temperature and coal slurry temperature on the reactor's gasification products and reaction rate were investigated, and the optimal conditions were determined.
Article
Thermodynamics
Sheng-Wei Chang, Ali Sadeghianjahromi, Wen-Jenn Sheu, Chi-Chuan Wang
Summary: 3D numerical simulations were conducted to investigate the thermofluids characteristics of oblique fin heat sinks under natural convection. The study identified critical parameters affecting performance, proposed an optimum heat sink configuration, and introduced a novel symmetrical oblique fin design. Experimental verification confirmed that the proposed oblique fin heat sink offers over 3°C reduction in maximum temperature compared to continuous fin heat sinks.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Green & Sustainable Science & Technology
Shahin Shoeibi, Nader Rahbar, Ahad Abedini Esfahlani, Hadi Kargarsharifabad
Summary: The impact of using air and water cooling glass in the double slope solar still was studied both numerically and experimentally. The water-cooled solar still had 81.1% more water productivity compared to the air-cooled one, while the modified water-cooled solar still increased water productivity by 21.53%.
