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S. Srinivasa Murthy - One of the best experts on this subject based on the ideXlab platform.
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Performance of a solid state hydrogen Storage Device with finned tube heat exchanger
International Journal of Hydrogen Energy, 2017Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:In the present study, a cylindrical solid state hydrogen Storage Device embedded with finned heat exchanger is numerically investigated. The finned heat exchanger consists of two `U' shaped tube and circular fins brazed on the periphery of the tubes. 1 kg of LaNi5 alloy is filled inside the Device and 80 g of copper flakes is evenly distributed in between the fins to increase the overall thermal conductivity of the metal hydride. Water is used as heat transfer fluid. Absorption performance of the Storage Device is investigated at constant hydrogen supply pressure of 15 bar and cooling fluid temperature and velocity of 298 K and 1 m/s respectively. At these operating conditions, the required charging time is found to be around 610 s for a Storage capacity of 12 g (1.2 wt%). The study is extended to examine the influence of different heat exchanger configurations based on number of fins, thickness of the fins, diameter of tubes, holes in fins, amount of copper flakes etc. An analysis for the same weight of the heat exchanger assembly has also been carried out by changing the number of fins at different thickness and pitch. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Experiments on solid state hydrogen Storage Device with a finned tube heat exchanger
International Journal of Hydrogen Energy, 2017Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:The absorption and desorption performances of a solid state (metal hydride) hydrogen Storage Device with a finned tube heat exchanger are experimentally investigated. The heat exchanger design consists of two ``U'' shaped cooling tubes and perforated annular copper fins. Copper flakes are also inserted in between the fins to increase the overall effective thermal conductivity of the metal hydride bed. Experiments are performed on the Storage Device containing 1 kg of hydriding alloy LaNi5, at various hydrogen supply pressures. Water is used as the heat transfer fluid. The performance of the Storage Device is investigated for different operating parameters such as hydrogen supply pressure, cooling fluid temperature and heating fluid temperature. The shortest charging time found is 490 s for the absorption capacity of 1.2 wt% at a supply pressure of 15 bar and cooling fluid temperature and velocity of 288 K and 1 m/s respectively. The effect of copper flakes on absorption performance is also investigated and compared with a similar Storage Device without copper flakes. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Effects of heat exchanger design on the performance of a solid state hydrogen Storage Device
International Journal of Hydrogen Energy, 2015Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:Heat exchanger design plays a significant role in the performance of solid state hydrogen Storage Device. In the present study, a cylindrical hydrogen Storage Device with an embedded annular heat exchanger tube with radial circular copper fins, is considered. A 3-D mathematical model of the Storage Device is developed to investigate the sorption performance of metal hydride (MH). A prototype of the Device is fabricated for 1 kg of MH alloy, LaNi5, and tested at constant supply pressure of hydrogen, validating the simulation results. Absorption characteristics of Storage Device have been examined by varying different operating parameters such as hydrogen supply pressure and cooling fluid temperature and velocity. Absorption process is completed in 18 min when these parameters are 15 bar, 298 K and 1 m/s respectively. A study of geometric parameters of copper fins (such as perforation, number and thickness of fin) has been carried out to investigate their effects on absorption process. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
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performance simulation of metal hydride hydrogen Storage Device with embedded filters and heat exchanger tubes
International Journal of Hydrogen Energy, 2007Co-Authors: G Mohan, Prakash M Maiya, S. Srinivasa MurthyAbstract:Abstract A practical metal hydride based hydrogen Storage Device would consist of many filters to distribute hydrogen gas and heat exchanger tubes to cool or heat the hydride bed depending on whether hydrogen is being absorbed or desorbed. This paper presents the simulation of such a Device with LaNi 5 as the hydriding alloy. A study of the geometric and operating parameters has been carried out to identify their influence in the hydriding performance of the Storage Device.
Anurag Singh - One of the best experts on this subject based on the ideXlab platform.
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Performance of a solid state hydrogen Storage Device with finned tube heat exchanger
International Journal of Hydrogen Energy, 2017Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:In the present study, a cylindrical solid state hydrogen Storage Device embedded with finned heat exchanger is numerically investigated. The finned heat exchanger consists of two `U' shaped tube and circular fins brazed on the periphery of the tubes. 1 kg of LaNi5 alloy is filled inside the Device and 80 g of copper flakes is evenly distributed in between the fins to increase the overall thermal conductivity of the metal hydride. Water is used as heat transfer fluid. Absorption performance of the Storage Device is investigated at constant hydrogen supply pressure of 15 bar and cooling fluid temperature and velocity of 298 K and 1 m/s respectively. At these operating conditions, the required charging time is found to be around 610 s for a Storage capacity of 12 g (1.2 wt%). The study is extended to examine the influence of different heat exchanger configurations based on number of fins, thickness of the fins, diameter of tubes, holes in fins, amount of copper flakes etc. An analysis for the same weight of the heat exchanger assembly has also been carried out by changing the number of fins at different thickness and pitch. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Experiments on solid state hydrogen Storage Device with a finned tube heat exchanger
International Journal of Hydrogen Energy, 2017Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:The absorption and desorption performances of a solid state (metal hydride) hydrogen Storage Device with a finned tube heat exchanger are experimentally investigated. The heat exchanger design consists of two ``U'' shaped cooling tubes and perforated annular copper fins. Copper flakes are also inserted in between the fins to increase the overall effective thermal conductivity of the metal hydride bed. Experiments are performed on the Storage Device containing 1 kg of hydriding alloy LaNi5, at various hydrogen supply pressures. Water is used as the heat transfer fluid. The performance of the Storage Device is investigated for different operating parameters such as hydrogen supply pressure, cooling fluid temperature and heating fluid temperature. The shortest charging time found is 490 s for the absorption capacity of 1.2 wt% at a supply pressure of 15 bar and cooling fluid temperature and velocity of 288 K and 1 m/s respectively. The effect of copper flakes on absorption performance is also investigated and compared with a similar Storage Device without copper flakes. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Effects of heat exchanger design on the performance of a solid state hydrogen Storage Device
International Journal of Hydrogen Energy, 2015Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:Heat exchanger design plays a significant role in the performance of solid state hydrogen Storage Device. In the present study, a cylindrical hydrogen Storage Device with an embedded annular heat exchanger tube with radial circular copper fins, is considered. A 3-D mathematical model of the Storage Device is developed to investigate the sorption performance of metal hydride (MH). A prototype of the Device is fabricated for 1 kg of MH alloy, LaNi5, and tested at constant supply pressure of hydrogen, validating the simulation results. Absorption characteristics of Storage Device have been examined by varying different operating parameters such as hydrogen supply pressure and cooling fluid temperature and velocity. Absorption process is completed in 18 min when these parameters are 15 bar, 298 K and 1 m/s respectively. A study of geometric parameters of copper fins (such as perforation, number and thickness of fin) has been carried out to investigate their effects on absorption process. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Subhash C. Mishra - One of the best experts on this subject based on the ideXlab platform.
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Thermal modeling of LmNi4.91Sn0.15 based solid state hydrogen Storage Device with embedded cooling tubes
International Journal of Hydrogen Energy, 2014Co-Authors: Subramanian Anbarasu, P. Muthukumar, Subhash C. MishraAbstract:Abstract A 2-D mathematical model is developed for predicting the minimum charging/discharging time of the metal hydride based hydrogen Storage Device by varying the number of cooling tubes embedded in it. This study is extended to 3-D mathematical model for predicting the hydriding and dehydriding characteristics of LmNi4.91Sn0.15 based hydrogen Storage Device with 60 embedded cooling tubes (ECT) using COMSOL Multiphysics 4.3. The performance of the hydrogen Storage Device during hydriding/dehydriding process is presented for different supply pressure (10–35 bar), hot fluid temperature (30–60 °C) and effective thermal conductivity of hydride bed (0.2–2.5 W/(m∙K)). It is observed that the rate of heat transfer and the hydriding and dehydriding rates are enhanced when the number of ECT is increased from 24 to 70. For the reactor with 60 ECT, the rate of hydrogen absorption is rapid for the supply pressure of 35 bar and hydride bed effective thermal conductivity of 2.5 W/(m∙K). The numerically predicted hydrogen Storage capacity (wt%) and amount of hydrogen desorbed (wt%) are compared with experimental data and found a good accord between them.
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tests on lmni4 91sn0 15 based solid state hydrogen Storage Device with embedded cooling tubes part a absorption process
International Journal of Hydrogen Energy, 2014Co-Authors: Subramanian Anbarasu, P. Muthukumar, Subhash C. MishraAbstract:Abstract In Part A of this manuscript which consists of two parts, the experimental investigations pertaining to the absorption of hydrogen in an LmNi 4.91 Sn 0.15 based solid state hydrogen Storage Device with embedded cooling tubes (ECT) are presented. Two metal hydride based hydrogen Storage Devices with 36 and 60 ECT filled with 2.75 kg of LmNi 4.91 Sn 0.15 were fabricated. Performances of the hydrogen Storage Devices in terms of hydrogen absorption rate and amount of hydrogen absorbed are reported for different supply pressures (10–35 bar), absorption temperatures (20–30 °C) and cooling fluid flow rates (2.2–30 l/min). At any given absorption temperature, the rate of hydrogen absorption and the amount of hydrogen absorbed are found to increase with hydrogen supply pressure up to about 35 bar. At the supply condition of 35 bar hydrogen pressure and 30 °C absorption temperature, with oil as a heat transfer fluid at a flow rate of 3.2 l/min, the maximum amount of hydrogen absorbed are ≈1.18 wt% in 10 min for 36 ECT, and 8 min for 60 ECT. At the absorption condition of 25 bar supply pressure, 30 l/min water flow rate and 30 °C absorption temperature, the absorption time of the reactor with 60 ECT was reduced to 5 min.
M. Prakash Maiya - One of the best experts on this subject based on the ideXlab platform.
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Performance of a solid state hydrogen Storage Device with finned tube heat exchanger
International Journal of Hydrogen Energy, 2017Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:In the present study, a cylindrical solid state hydrogen Storage Device embedded with finned heat exchanger is numerically investigated. The finned heat exchanger consists of two `U' shaped tube and circular fins brazed on the periphery of the tubes. 1 kg of LaNi5 alloy is filled inside the Device and 80 g of copper flakes is evenly distributed in between the fins to increase the overall thermal conductivity of the metal hydride. Water is used as heat transfer fluid. Absorption performance of the Storage Device is investigated at constant hydrogen supply pressure of 15 bar and cooling fluid temperature and velocity of 298 K and 1 m/s respectively. At these operating conditions, the required charging time is found to be around 610 s for a Storage capacity of 12 g (1.2 wt%). The study is extended to examine the influence of different heat exchanger configurations based on number of fins, thickness of the fins, diameter of tubes, holes in fins, amount of copper flakes etc. An analysis for the same weight of the heat exchanger assembly has also been carried out by changing the number of fins at different thickness and pitch. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Experiments on solid state hydrogen Storage Device with a finned tube heat exchanger
International Journal of Hydrogen Energy, 2017Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:The absorption and desorption performances of a solid state (metal hydride) hydrogen Storage Device with a finned tube heat exchanger are experimentally investigated. The heat exchanger design consists of two ``U'' shaped cooling tubes and perforated annular copper fins. Copper flakes are also inserted in between the fins to increase the overall effective thermal conductivity of the metal hydride bed. Experiments are performed on the Storage Device containing 1 kg of hydriding alloy LaNi5, at various hydrogen supply pressures. Water is used as the heat transfer fluid. The performance of the Storage Device is investigated for different operating parameters such as hydrogen supply pressure, cooling fluid temperature and heating fluid temperature. The shortest charging time found is 490 s for the absorption capacity of 1.2 wt% at a supply pressure of 15 bar and cooling fluid temperature and velocity of 288 K and 1 m/s respectively. The effect of copper flakes on absorption performance is also investigated and compared with a similar Storage Device without copper flakes. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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Effects of heat exchanger design on the performance of a solid state hydrogen Storage Device
International Journal of Hydrogen Energy, 2015Co-Authors: Anurag Singh, M. Prakash Maiya, S. Srinivasa MurthyAbstract:Heat exchanger design plays a significant role in the performance of solid state hydrogen Storage Device. In the present study, a cylindrical hydrogen Storage Device with an embedded annular heat exchanger tube with radial circular copper fins, is considered. A 3-D mathematical model of the Storage Device is developed to investigate the sorption performance of metal hydride (MH). A prototype of the Device is fabricated for 1 kg of MH alloy, LaNi5, and tested at constant supply pressure of hydrogen, validating the simulation results. Absorption characteristics of Storage Device have been examined by varying different operating parameters such as hydrogen supply pressure and cooling fluid temperature and velocity. Absorption process is completed in 18 min when these parameters are 15 bar, 298 K and 1 m/s respectively. A study of geometric parameters of copper fins (such as perforation, number and thickness of fin) has been carried out to investigate their effects on absorption process. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.
Subramanian Anbarasu - One of the best experts on this subject based on the ideXlab platform.
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Thermal modeling of LmNi4.91Sn0.15 based solid state hydrogen Storage Device with embedded cooling tubes
International Journal of Hydrogen Energy, 2014Co-Authors: Subramanian Anbarasu, P. Muthukumar, Subhash C. MishraAbstract:Abstract A 2-D mathematical model is developed for predicting the minimum charging/discharging time of the metal hydride based hydrogen Storage Device by varying the number of cooling tubes embedded in it. This study is extended to 3-D mathematical model for predicting the hydriding and dehydriding characteristics of LmNi4.91Sn0.15 based hydrogen Storage Device with 60 embedded cooling tubes (ECT) using COMSOL Multiphysics 4.3. The performance of the hydrogen Storage Device during hydriding/dehydriding process is presented for different supply pressure (10–35 bar), hot fluid temperature (30–60 °C) and effective thermal conductivity of hydride bed (0.2–2.5 W/(m∙K)). It is observed that the rate of heat transfer and the hydriding and dehydriding rates are enhanced when the number of ECT is increased from 24 to 70. For the reactor with 60 ECT, the rate of hydrogen absorption is rapid for the supply pressure of 35 bar and hydride bed effective thermal conductivity of 2.5 W/(m∙K). The numerically predicted hydrogen Storage capacity (wt%) and amount of hydrogen desorbed (wt%) are compared with experimental data and found a good accord between them.
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tests on lmni4 91sn0 15 based solid state hydrogen Storage Device with embedded cooling tubes part a absorption process
International Journal of Hydrogen Energy, 2014Co-Authors: Subramanian Anbarasu, P. Muthukumar, Subhash C. MishraAbstract:Abstract In Part A of this manuscript which consists of two parts, the experimental investigations pertaining to the absorption of hydrogen in an LmNi 4.91 Sn 0.15 based solid state hydrogen Storage Device with embedded cooling tubes (ECT) are presented. Two metal hydride based hydrogen Storage Devices with 36 and 60 ECT filled with 2.75 kg of LmNi 4.91 Sn 0.15 were fabricated. Performances of the hydrogen Storage Devices in terms of hydrogen absorption rate and amount of hydrogen absorbed are reported for different supply pressures (10–35 bar), absorption temperatures (20–30 °C) and cooling fluid flow rates (2.2–30 l/min). At any given absorption temperature, the rate of hydrogen absorption and the amount of hydrogen absorbed are found to increase with hydrogen supply pressure up to about 35 bar. At the supply condition of 35 bar hydrogen pressure and 30 °C absorption temperature, with oil as a heat transfer fluid at a flow rate of 3.2 l/min, the maximum amount of hydrogen absorbed are ≈1.18 wt% in 10 min for 36 ECT, and 8 min for 60 ECT. At the absorption condition of 25 bar supply pressure, 30 l/min water flow rate and 30 °C absorption temperature, the absorption time of the reactor with 60 ECT was reduced to 5 min.
