Article
Chemistry, Physical
Gamze Atalmis, Mehmet Demiralp, Nebi Yelegen, Yuksel Kaplan
Summary: This study investigates the process parameters that affect the improvement of hydrogen storage material properties. The thermal conductivity of the storage materials has been improved to accelerate the hydrogen charge/discharge processes and obtain the required hydrogen at desired flow rates in a short time. The experimental results show that coating the storage material with copper increases heat transfer, reduces the hydrogen charging time, and improves stable discharge time in the metal hydride reactor.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Ke Wang, Wei Chen, Lu Li
Summary: Metal hydride hydrogen storage (MHHS) is an efficient technology for improving hydrogen storage. This study investigates the interaction between reaction and heat-mass transfer in a specific example of LaNi5 using a multi-field coupling model. The study reveals that operating parameters have significant influences on the absorption reaction evolution. Additionally, external cooling measures and resistance atlas can significantly enhance the absorption evolution and clarify the characteristics of reaction and heat-mass transport.
Article
Chemistry, Physical
K. Malleswararao, N. Aswin, Pramod Kumar, Pradip Dutta, S. Srinivasa Murthy
Summary: This paper investigates the application of metal hydrides in thermal energy storage and hydrogen storage. A low temperature hydride, La0.75Ce0.25Ni5, is experimentally studied for its hydrogen storage capacity and thermal energy storage capacity. The heat and mass transfer characteristics of a novel reactor design are also investigated.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
K. Malleswararao, Pramod Kumar, Pradip Dutta, S. Srinivasa Murthy
Summary: This study investigates the hydrogen storage characteristics and thermal storage performance of LaNi4.25Al0.75 alloy in the temperature range of 150°C-200°C. The alloy exhibits a hydrogen storage capacity of 1.20 wt% and can store a total thermal energy of 285.7 kJ.kg-1 and deliver heat at an average rate of 287.5 W.kg-1 with an efficiency of 64.1%.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
Alok Kumar, P. Muthukumar
Summary: The present study investigates the poisoning effect of CH4 as gaseous impurities in a La0.9Ce0.1Ni5 based Metal Hydride Hydrogen Purification System (MHHPS). The impurity level was varied between 10% and 50% by weight in the H-2 gas mixture, and cyclic tests were performed with 10% impurity. The system delivered 99.9995% pure hydrogen for 10-20% impure gas mixture. The cyclic study showed a decrease in hydrogen absorption for impurity levels between 50% and 90%. The regeneration of the poisoned Metal Hydride (MH) bed was more effective at desorption temperatures above 90 degrees C.
Article
Chemistry, Physical
Terry D. Humphries, Mark Paskevicius, Ali Alamri, Craig E. Buckley
Summary: Thermal batteries are efficient for storing renewable energies, utilizing reversible thermochemical reactions to drive a heat engine. Studies on the SrH2-2Al system have shown promising properties for high efficiency operation, which could enhance technological applications.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Thermodynamics
Liang Tong, Chengqing Yuan, Tianqi Yang, Pierre Benard, Yupeng Yuan, Jinsheng Xiao
Summary: Various thermal management methods are widely adopted in the metal hydride (MH) system to release the thermal effect and obtain acceptable hydrogen storage performance. In this study, an axisymmetric numerical model for a simple MH system without a heat exchanger (HE) has been established and validated to study the system performance during dehydriding. The coiled-tube heat exchanger (CTHE) shows more obvious impact than the phase change material heat exchanger (PCMHE) in improving the performance of the MH system during dehydriding.
CASE STUDIES IN THERMAL ENGINEERING
(2021)
Article
Energy & Fuels
Yang Ye, Jing Ding, Weilong Wang, Jinyue Yan
Summary: The configuration of phase change materials in hydrogen storage tanks affects the storage performance. Sandwiched MH-PCM units have faster heat transfer and reaction rates due to larger transfer area and smaller thermal resistance. The amount of PCM affects the reaction fraction and can slightly impact absorption and desorption rates when reduced within sufficient limits.
Article
Chemistry, Physical
Taejun Ha, Vivek Shukla, Taewook Na, Young Whan Cho, Jin-Yoo Suh, Jae-Hyeok Shim, Young -Su Lee
Summary: This study reports the development of a two-stage metal hydride hydrogen compressor capable of compressing hydrogen from 1 to 30 MPa through a temperature change. The selected alloys were successfully used in a laboratory-scale compressor, and the compression capacity was analyzed to estimate the usable capacity of the materials. The results of this study can guide the design and evaluation of multistage MHHCs.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Michael Lutz, Matthias Schmidt, Inga Buerger, Marc Linder
Summary: This research conducts a fundamental analysis of a novel thermochemical system, revealing the technical potential of metal hydrides as energy storage components and indicating the relationship between higher pressure ratio, increased storage density, and decreased efficiency.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
Evangelos I. Gkanas, Emmanuel Stamatakis, Christodoulos N. Christodoulou, George Tzamalis, George Karagiorgis, Alexander Chroneos, Navaratnarajah Kuganathan, Martin Khzouz, Athanasios K. Stubos
Summary: This study introduces and compares four different two-stage MHHCs, discussing key performance indicators during hydrogen compression. Experimental results show that under certain temperature ranges, some MHHCs exhibit high compression ratios and efficiencies.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
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
Energy & Fuels
Swaraj D. Lewis, Purushothama Chippar
Summary: This paper presents a study on the heat and mass transfer during charging and discharging processes in a metal hydride reactor equipped with phase change material. By exploring the effects of incorporating metal foam into the PCM and optimizing the heat transfer, hydrogen charging and discharging rates were significantly improved. The research also highlights the limitations posed by the MH powder thermal conductivity on heat transfer and optimizes metal foam morphology for better performance.
JOURNAL OF ENERGY STORAGE
(2021)
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
Chemistry, Physical
H. Chang, Y. B. Tao, H. Ye
Summary: In this study, a new sandwich configuration reaction bed of metal hydride-thermochemical material (MH-TCM) system was proposed and its excellent hydrogen and thermal storage performance was numerically validated. The results showed that the sandwich reaction bed had faster transfer and reaction rate, resulting in a 61.1% reduction in hydrogen storage time. Increasing the thermal conductivity of the reaction beds further reduced the storage time, while improving the hydrogen inflation pressure enhanced heat transfer and hydrogen absorption rates.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Thermodynamics
P. Muthukumar, Manojkumar S. Patil, Nithin N. Raju, Mohd Imran
APPLIED THERMAL ENGINEERING
(2016)
Article
Chemistry, Physical
Alok Kumar, Nithin N. Raju, P. Muthukumar, P. Vivek Selvan
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Chemistry, Physical
Nithin N. Raju, P. Muthukumar, P. Vivek Selvan, K. Malleswararao
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Correction
Chemistry, Physical
Alok Kumar, Nithin N. Raju, P. Muthukumar, P. Vivek Setuan
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2019)
Article
Energy & Fuels
Alok Kumar, Nithin N. Raju, P. Muthukumar
Summary: This study investigated the parametric effects on the absorption and desorption rates of MmNi(4.7)Fe(0.3) under different conditions, utilizing varied pressures and temperatures to analyze the reaction kinetics. The findings suggest that optimizing H-2 supply pressure and temperature can significantly impact the absorption and desorption rates of hydrogen in the system.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
Sayantan Jana, P. Muthukumar, Nithin Narmada Raju
Summary: In this study, an embedded cooling tube type metal hydride reactor was designed and tested for integration with a low-temperature Polymer Electrolyte Membrane Fuel Cell. The reactor demonstrated efficient hydrogen absorption and discharge, with higher discharge rates at elevated temperatures.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Prabakaran Ganeshan, V. S. Vigneswaran, Sarath C. Gowd, Dhamodharan Kondusamy, C. Sanjay Kumar, Nageshwari Krishnamoorthy, Deepak Kumar, Ankita Juneja, Balasubramanian Paramasivan, Nithin N. Raju, Karthik Rajendran, Arivalagan Pugazhendhi
Summary: Hydrogen is considered as the fuel of the future due to its high energy density and zero-carbon emission potential. Techno-economic analysis (TEA) and life cycle analysis (LCA) of various bio-hydrogen generation processes can help identify cost-effective and low-carbon methods, attracting investors and overcoming barriers to hydrogen integration in the energy market. Gasification was found to be the most economical method for bio-hydrogen production, followed by anaerobic digestion. The gasification of eucalyptus wood was found to have the least carbon footprint.
Article
Thermodynamics
Sayantan Jana, Nithin Narmada Raju, P. Muthukumar
Summary: This study investigated the heating and cooling characteristics of two AB5 type metal hydride alloys, revealing that the LCC1 (R) alloy performed better during absorption and is recommended for decentralized hydrogen storage cum heating applications.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2022)
Proceedings Paper
Energy & Fuels
Nithin Narmada Raju, Alok Kumar, K. Malleswararao, P. Muthukumar
INNOVATIVE SOLUTIONS FOR ENERGY TRANSITIONS
(2019)
