Review
Thermodynamics
K. Malleswararao, Pradip Dutta, Murthy S. Srinivasa
Summary: Metal hydrides have attracted attention for various thermal applications due to their wide range of operating temperatures and pressures. This paper provides a comprehensive review of theoretical and experimental studies on the thermal applications of metal hydrides, such as refrigeration, heat transformers, heat pumps, and thermal energy storage.
APPLIED THERMAL ENGINEERING
(2022)
Article
Chemistry, Physical
Arnaud C. M. Griffond, M. Veronica Sofianos, Drew A. Sheppard, Terry D. Humphries, Anna-Lisa Sargent, Martin Dornheim, Kondo-Francois Aguey-Zinsou, Craig E. Buckley
Summary: The thermal energy storage properties of calcium hydride (CaH2) destabilized with silicon (Si) or CaxSiy compounds at various molar ratios were studied, revealing multi-step thermal decomposition reactions and identifying the most suitable compounds for concentrated solar power plants. The practical enthalpy of decomposition for Ca5Si3 was determined through pressure composition isothermal measurements, showing a discrepancy with the calculated value due to the formation of unwanted phases.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Energy & Fuels
Talal Alqahtani
Summary: The combination of a metal hydride and a water pump has attracted significant interest. However, the system's efficiency is low due to the need for substantial external heat input. Storing the heat generated by the exothermic reaction in a phase change material and reusing it during the endothermic reaction improves the pump's efficiency.
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
(2022)
Review
Chemistry, Physical
Huy Quoc Nguyen, Bahman Shabani
Summary: This paper comprehensively reviews thermal management solutions for MH hydrogen storage used in fuel cell systems, focusing on heat transfer enhancement techniques and assessment of heat sources. It is recommended that the ETC of the MH bed should be greater than 2 W/mK, and the heat transfer coefficient with heating/cooling media should be in the range of 1000-1200 W/m2K to achieve desired MH's performance.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
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
Green & Sustainable Science & Technology
Nan Zhang, Yiji Lu, Zhibin Yu
Summary: A novel integrated cooling system was developed to reduce power consumption and extend the driving range of medium to large electric vehicles, by integrating various components such as fuel cell, battery, metal-hydride, heat pump, and liquid desiccant dehumidification system. The system utilizes wasted energy from different sources and has been validated through numerical and experimental models. The effects of various factors on the system performance were evaluated, and a comparison of different operating modes was conducted.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Chemistry, Physical
Ismail Hilali, Ahmet Akbas, Vehbi Balak, Dursun Akaslan, Kemal Guner
Summary: Thermal control is crucial for the life cycle of metal hydride tanks. We experimentally validate the ideal distance in an optimized metal hydride array and find that simple geometrical arrangements can enhance the efficiency of fuel cellmetal hydride systems.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Sruthy Balakrishnan, Terry D. Humphries, Mark Paskevicius, Craig E. Buckley
Summary: Calcium hydride has shown potential as a hydrogen storage and thermochemical energy storage material, but its high operating temperature has limited its application and research on its hydrogen sorption thermodynamics. This study provides experimental data on the thermodynamic properties and activation energy of CaH2 in both solid and molten states, filling the gap in the thermodynamics of the Ca-H system for the first time in over 60 years.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Green & Sustainable Science & Technology
Youngguk Seo, Un-Jong Seo
Summary: The study on using geothermal energy supply for greenhouses showed promising results in field tests in South Korea, demonstrating increased income, shortened payback periods, and viability for investment.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2021)
Review
Energy & Fuels
Vamsi Krishna Kukkapalli, Sunwoo Kim, Seth A. Thomas
Summary: Metal hydrides are materials that can absorb and release large amounts of hydrogen, with potential applications in hydrogen storage and chemical processing. However, their widespread use is hindered by challenges. This review article provides an overview of the latest techniques in metal hydride reactor design and heat transfer enhancement, identifying key areas for future research.
Article
Energy & Fuels
Zewei Bao, Xiaofeng Mou
Summary: Incorporating a HCHE into MH reactors can enhance hydrogen absorption rate, but the effects of operating parameters on bed temperature and fluid temperature must be considered. Increasing hydrogen supply pressure and fluid flow rate can improve heat transfer performance, but may lead to uneven temperature variations, limiting application in heating systems. Furthermore, careful consideration is needed when selecting fluid velocity inside heat exchanger tubes for MH reactor design.
JOURNAL OF ENERGY STORAGE
(2021)
Article
Chemistry, Physical
A. Cousins, F. T. Zohra, E. MacA. Gray, C. J. Webb, M. Kochanek, S. Edwards, L. Schoeman
Summary: Metal hydrides are a potential method for compressing hydrogen using waste heat. They absorb low-pressure hydrogen at low temperatures and release it at a higher pressure when the temperature is raised. Achieving higher compression ratios may require multiple stages of compression. The challenge lies in finding alloy pairs that can effectively work together to achieve the desired compression. The paper evaluates the selection of 33 hydrides for hydrogen compression, but none of the potential pairs meet the compression target. Modification of parameters or alloy properties could potentially resolve this issue. Overall, the paper highlights the importance of finding suitable alloy pairs for efficient hydrogen compression.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Energy & Fuels
Serge Nyallang Nyamsi, Wafeeq Davids, Ivan Tolj, Sivakumar Pasupathi, Mykhaylo Lototskyy
Summary: Thermal batteries using metal hydride pairs are attracting attention for their potential in thermochemical energy storage. The combination of high-temperature metal hydrides, such as Mg-based hydrides, and low-temperature metal hydrides, like AB2 type hydrides, offers high energy storage density and moderate energy storage efficiency. Improving the heat discharging performance of thermal batteries can significantly enhance the energy storage efficiency. In this study, the heat releasing performance of an MgH2/(TiZr)(MnFeCr)2-based thermal battery was experimentally investigated, with a focus on the effects of different LTMH bed heat transfer conditions. The results showed that active heat transfer conditions, such as forced convection or resistive heating, led to a thermochemical energy storage density ranging from 1500 to 1820 kJ/kg-Mg and a relatively high-temperature lift between 47 and 55 degrees Celsius. Additionally, the thermal battery discharged heat at a relatively high specific power, which could be advantageous for heat-to-work conversion applications using organic or steam Rankine cycles.
JOURNAL OF ENERGY STORAGE
(2023)
Article
Chemistry, Physical
Lucas Poupin, Terry D. Humphries, Mark Paskevicius, Craig E. Buckley
Summary: Metal hydrides are effective energy storage materials for thermal battery applications, with Magnesium iron hydride (Mg2FeH6) showing promising reversible hydrogenation reactions for thermal energy storage. The automated thermal battery prototype demonstrated excellent cyclic energy storage reversibility and achieved a maximum energy capacity of 1650 kJ, which is 87% of the theoretical value. Operating conditions such as ideal temperature, flow rate of heat transfer fluid, and hydrogen pressures were optimized to enhance the performance of the system.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
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.
