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Author: search.filters.author.Verma, SaketSubject: search.filters.subject.Hydrogen storage

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    Dynamic modelling and control strategy of a temperature-driven metal hydride cooling system for buildings
    (Elsevier, 2025-03) Verma, Saket
    A temperature-driven coupled metal hydride (MH) based thermal energy storage (TES) system can allow to shave and shift the peak energy demand in buildings. The high energy density and long-term (seasonal) energy storage capability are its major advantages over other energy storage methods. The dynamic nature of the MH operation, however, requires controlled hydrogen transfer between the coupled MHs at a rate needed to meet the building’s transient load. While temperature-driven MH systems are studied in the literature, their application in buildings and control are scarcely reported. This paper presents a control-based dynamic modeling of the temperature-driven coupled MH-TES system for building cooling applications. The dynamic model is developed in MATLAB® Simulink environment, considering the thermodynamic and kinetic behaviors of the MH systems. Based on a preliminary analysis of a property database of over 337 hydrides, we select around 1600 MH pairs suitable for building cooling applications. Each of these MH pairs is studied for their performance using the dynamic model, and among all, Zr0.76Ti0.24Ni1.16Mn0.63V0.14Fe0.18–Ti0.85Zr0.15Cr1.2Mn0.8 MH pair showed fast dynamics along with high coefficient of performance (COP) of 0.71. A parametric investigation is performed on this MH pair to understand the effect of operating temperatures. Finally, three proportional-integral (PI) feedback controllers are investigated to regulate the temperature, pressure and mass exchange between the coupled MH pairs. The developed PI controller is sufficiently capable of rejecting the signal noise from the hydrogen flow and internal heat exchange processes with root mean square error of 5.78 W between reference and actual cooling load.
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    Renewable sources based DC microgrid using hydrogen energy storage: Modelling and experimental analysis
    (Elsevier, 2020-12) Verma, Saket
    A microgrid (µG) system can be operated in DC or AC modes using suitable power electronics interface which interconnect power generators, loads and energy storage mediums. It can be interesting to analyze the potential advantages of hydrogen storage-based DC µG system. In this study, a mathematical model is developed for the theoretical prediction of the performance in terms of energy analysis of overall system and charging/discharging characteristics of hydrogen storage unit in the µG. It is found that DC mode of operation of the µG significantly increases the performance and energy efficiency of overall system. A power management system (PMS) is designed which addresses the issues related to the integration of renewable power sources, stability of DC bus voltage, demand–supply balance, and load dynamics involved in the system. The designed PMS working shows that integration of the PV, FC, electrolyzer, and battery is suitable to meet the load demand in the transient operating conditions such as low and high PV power generation; and abrupt increase and decrease in the load demand. After simulation realization, a hardware prototype of PMS is designed and developed which validates its working.