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Reversible Alkali Metal Based Hydrides for High Temperature Thermal Energy Storage

Subcategory (under Clean Energy): Hydrogen
Technology Readiness Level (TRL): TRL 4 - Early prototype
Technology Outline (Process Description)

MH- based tri-generation system that can provide simultaneous cooling, heat upgradation, and thermal energy storage at higher temperatures is developed. The performances of thermal-driven and compressor-driven coupled reactor systems are analyzed. The transient behavior of the thermal-driven MHTES system working with Mg/MgH2 and MmNi4.6Al0.4/ MmNi4.6Al0.4H6 pair is predicted by solving the governing coupled heat- and mass transfer equations. The effect of inlet temperature of HTF during charging and discharging on the variation of hydride bed temperature, concentration, and amount of hydrogen absorbed/ desorbed is studied. The working prototype of simultaneous cooling, heat upgradation and thermal energy storage is demonstrated

Salient Features/Advantages

  • The developed system can provide simultaneous cooling, heat upgradation, and thermal energy storage at high temperatures
  • The system can store 10 MJ of the energy in the temperature range of 300 to 425 °C.
  • The tri-generation system upgraded the heat to 423 °C from 380 °C at a rate of 5.01 kW and also delivered a simultaneous cooling output of 2 kW at 20°C for the compression ratio of 7

Key Outcomes

  • During charging process of thermal-driven MH-based TES system, for an inlet temperature of 380 °C, 81% of the maximum H2 storage capacity is transferred in 60 min
  • During discharging process of thermal-driven MH-based TES system, for LTMH’s inlet temperature of 30 °C, 2% of maximum H2 storage capacity is transferred in 60 min 
  • The compressor-driven MH-based tri-generation system exhibited a maximum COP and maximum thermal efficiency of 3.85 and 80.28%, respectively for the compression ratio of 5 and the cooling temperature of 15°C

IP Protection details

  • Patent filed (Title, national/International): Nil
  • Patents Granted: Nil
  • Copyrights obtained /progress on commercialisation /Pl. specify connect with industry: Nil

Contact details (for more information)

  • Nodal Person name: Prof. Muthukumar
  • Email ID: pmkumar@iittp.ac.in
  • Organisation name (Relevant link/web page): IIT Tirupati
Supporting Photographs/Images

Organizations involved in the development (logo/name)

Indian Institute Of Technology (IIT) Tirupati

Indian Institute of Technology (IIT) Guwahati

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