Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection
Metal hydride (MH) systems can be used for storage in stationary facilities of hydrogen with a high volume density at temperatures and pressures close to ambient ones. Recently, the possibility of using passive heating/cooling systems or regenerative heat exchangers has been studied to improve the e...
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| Format: | Article |
| Language: | English |
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KeAi Communications Co., Ltd.
2023-12-01
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| Series: | Energy Storage and Saving |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2772683523000444 |
| _version_ | 1797339135747293184 |
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| author | Konstantin Borisovich Minko Maksim Nashchekin |
| author_facet | Konstantin Borisovich Minko Maksim Nashchekin |
| author_sort | Konstantin Borisovich Minko |
| collection | DOAJ |
| description | Metal hydride (MH) systems can be used for storage in stationary facilities of hydrogen with a high volume density at temperatures and pressures close to ambient ones. Recently, the possibility of using passive heating/cooling systems or regenerative heat exchangers has been studied to improve the energy efficiency of MH systems for hydrogen storage without the need for forced circulation of a heating/cooling fluid. Natural convection of air may be used to passively remove/add heat as required for proper operation of a MH reactor. Under these conditions, the MH reactor can operate at a constant ambient air temperature and be driven by a difference in pressure between the source and the consumer of hydrogen. Since operation of MH systems with natural convective heating/cooling has not been systematically investigated as yet, a tubular MH reactor based on this principle is examined in this paper. Two-thirds of the internal volume of ø25.4 × 1 mm tube is occupied by a composition of LaNi5 and aluminium foam (one linear metre contains 1.1 kg of LaNi5 with a hydrogen capacity of 153 NL H2). Annular fins are used to increase heat transfer to air. Detailed and simplified mathematical models of the systems of this class are proposed and validated. It is shown that acceptable hydrogen charging/discharging rates in such systems are achieved with proper selection of fining characteristics. Charging from a hydrogen source at a pressure of 10 atm and an ambient air temperature of 10 to 30 °C takes 15 min. A reactor with a length of 1 m can desorb almost all stored hydrogen at a minimum outlet pressure of 0.45 bar to feed 30–300 W fuel cells. |
| first_indexed | 2024-03-08T09:41:33Z |
| format | Article |
| id | doaj.art-38bb439bf77b43a49c9dd32a5eab0742 |
| institution | Directory Open Access Journal |
| issn | 2772-6835 |
| language | English |
| last_indexed | 2024-03-08T09:41:33Z |
| publishDate | 2023-12-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Energy Storage and Saving |
| spelling | doaj.art-38bb439bf77b43a49c9dd32a5eab07422024-01-30T04:19:09ZengKeAi Communications Co., Ltd.Energy Storage and Saving2772-68352023-12-0124597607Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convectionKonstantin Borisovich Minko0Maksim Nashchekin1Corresponding author.; Department of Engineering Thermophysics, Moscow Power Engineering Institute (MPEI), National Research University, Moscow, 111250, RussiaDepartment of Engineering Thermophysics, Moscow Power Engineering Institute (MPEI), National Research University, Moscow, 111250, RussiaMetal hydride (MH) systems can be used for storage in stationary facilities of hydrogen with a high volume density at temperatures and pressures close to ambient ones. Recently, the possibility of using passive heating/cooling systems or regenerative heat exchangers has been studied to improve the energy efficiency of MH systems for hydrogen storage without the need for forced circulation of a heating/cooling fluid. Natural convection of air may be used to passively remove/add heat as required for proper operation of a MH reactor. Under these conditions, the MH reactor can operate at a constant ambient air temperature and be driven by a difference in pressure between the source and the consumer of hydrogen. Since operation of MH systems with natural convective heating/cooling has not been systematically investigated as yet, a tubular MH reactor based on this principle is examined in this paper. Two-thirds of the internal volume of ø25.4 × 1 mm tube is occupied by a composition of LaNi5 and aluminium foam (one linear metre contains 1.1 kg of LaNi5 with a hydrogen capacity of 153 NL H2). Annular fins are used to increase heat transfer to air. Detailed and simplified mathematical models of the systems of this class are proposed and validated. It is shown that acceptable hydrogen charging/discharging rates in such systems are achieved with proper selection of fining characteristics. Charging from a hydrogen source at a pressure of 10 atm and an ambient air temperature of 10 to 30 °C takes 15 min. A reactor with a length of 1 m can desorb almost all stored hydrogen at a minimum outlet pressure of 0.45 bar to feed 30–300 W fuel cells.http://www.sciencedirect.com/science/article/pii/S2772683523000444Metal hydrideHydrogen storageNatural convectionAnnular finsCFDNumerical simulation |
| spellingShingle | Konstantin Borisovich Minko Maksim Nashchekin Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection Energy Storage and Saving Metal hydride Hydrogen storage Natural convection Annular fins CFD Numerical simulation |
| title | Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection |
| title_full | Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection |
| title_fullStr | Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection |
| title_full_unstemmed | Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection |
| title_short | Thermal performance of a metal hydride reactor for hydrogen storage with cooling/heating by natural convection |
| title_sort | thermal performance of a metal hydride reactor for hydrogen storage with cooling heating by natural convection |
| topic | Metal hydride Hydrogen storage Natural convection Annular fins CFD Numerical simulation |
| url | http://www.sciencedirect.com/science/article/pii/S2772683523000444 |
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