Experimental research on refrigeration characteristics of a metal hydride heat pump in auto air-conditioning

Ni, Jiujian; Liu, Hong‐Min

doi:10.1016/j.ijhydene.2006.09.038

Cited by 51 publications

(11 citation statements)

References 10 publications

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“…Although many studies have focused in predicting the performance of these systems, the number of experimental installations remains rather scarce. Several metal hydride cooling prototypes have been developed and tested in Germany [2], China [23], India [3] and Japan [8]. Very recently, two interesting review articles [1,24] have been published giving an overview of the experimental systems which have been developed up to now.…”

Section: State Of the Art Of The Technologymentioning

confidence: 99%

“…heating and pre-cooling phases [6,10,23]. Gambini [21] showed that these phases can theoretically be included in the regeneration and cooling phase, hereby simplifying the operation of the system.…”

Section: State Of the Art Of The Technologymentioning

confidence: 99%

“…As in other experimental MHCSs from literature [3,4,6,8,10,23,29,35], the sorption alloys which are used are based on a combination of lanthanum and mischmetal-based alloys.…”

Section: Chaptermentioning

confidence: 99%

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Modelling and analysis of a metal hydride cooling system

Herrero¹

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The work which is presented by J. Payá Herrero, titled "Modelling and analysis of a metal hydride cooling system" has been carried out at the Institute for Energy Engineering under my supervision and assessment.As the modelling and experimental objectives have been reached, I authorise the submission of this PhD work for its evaluation by the corresponding examination board. This PhD thesis consists in the modelling and validation of a metal hydride cooling system. The experimental prototype is located in the institute IKE.In the first place, the hydrogen absorbing materials have been characterized in terms of the static P-C-T properties and of the intrinsic reaction kinetics. In the second place, after this first characterization phase, a completely dynamic model has been developed based on the heat and mass transfer processes which take place in the reactors. The results have been validated with an exhaustive experimental campaign of dynamic cooling tests and the adjustment of the model is very good.Finally, the cooling performance of the system has been improved by means of the model which has enabled the optimization of the operating conditions and of the sorption materials. El presente estudio consiste en el modelado y validación de un sistema de producción de frío basado en la absorción/desorción de hidrógeno en metales.La instalación experimental que se ha modelado se halla en el instituto IKE.En primer lugar, los materiales utilizados se han caracterizado tanto desde el punto de vista de las curvas P-C-T de equilibrio como de la cinética de absorción/desorción de cada aleación. En segundo lugar, se ha desarrollado un modelo completamente dinámico basado en las reacciones de transferencia de calor y masa que ocurren en los reactores. Los resultados se han validado con una amplia gama de medidas de IKE en régimen transitorio, obteniendo un ajuste muy bueno para diferentes ensayos.Finalmente, mediante la utilización del modelo, se han optimizado las condiciones de operación y las propiedades de los materiales, alcanzando así mejores prestaciones en refrigeración.

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Section: State Of the Art Of The Technologymentioning

confidence: 99%

Section: State Of the Art Of The Technologymentioning

confidence: 99%

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Modelling and analysis of a metal hydride cooling system

Herrero¹

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“…The mass ratio of the metal hydride to the reactor was assumed as 1:0.75, heat recovery factor (f r ) as 0.45, specific heat of metal hydrides (C) and reactor (vessel) material (C r ) as 0.36 kJ/kg K and 0.46 kJ/kg K respectively [21]. The cycle time (t cyl ) was assumed to be 64 min for 2.75 kg of refrigeration alloy, based on the experimental and theoretical work on LaNi 5 based high pressure and low pressure metal hydrides [22,35]. The mass of the regeneration alloy (m reg ) was estimated from Eq.…”

Section: Metal Hydride Based Cooling Systemmentioning

confidence: 99%

Studies on La based intermetallic hydrides to determine their suitability in metal hydride based cooling systems

Sharma

Kumar

2015

Intermetallics

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“…Issues associated with hydrogen storage materials are the storage capacity, the thermal stability of the hydride, the kinetics of hydrogenation and dehydrogenation, thermophysical properties and crystal structures. Specifically fast reaction kinetics and high hydrogen storage capacity are the most important properties of the alloys used in thermal devices [4], compression systems [5][6][7] and heat pumps [8,9]. Generally the limiting factor controlling the hydrogen charging/discharging in a metal hydride reactor is the rate at which heat can be transferred between the hydride and the reactor.…”

Section: Introductionmentioning

confidence: 99%

Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces

Gkanas

Grant

Khzouz

et al. 2016

International Journal of Hydrogen Energy

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The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractIn the current work, a three-dimensional computational study regarding coupled heat and mass transfer during both the hydrogenation and dehydrogenation process in upscale cylindrical metal hydride reactors is presented, analysed and optimized. Three different heat management scenarios were examined at the degree to which they provide improved system performance. The three scenarios were: 1) Plain embedded cooling/heating tubes, 2) transverse finned tubes and 3) longitudinal finned tubes. A detailed optimization study was presented leading to the selection of the optimized geometries. In addition, two different types of hydrides, LaNi5 and an AB2-type intermetallic were studied as possible candidate materials for using as the first stage alloys in a two-stage metal hydride hydrogen compression system. As extracted from the above results, it is clear that the case of using a vessel equipped with 16 longitudinal finned tubes is the most efficient way to enhance the hydrogenation kinetics when using both LaNi5 and the AB2-alloy as the hydride agents. When using LaNi5 as the operating hydride the case of the vessel equipped with 60 embedded cooling tubes presents the same kinetic behaviour with the case of the vessel equipped with 12 longitudinal finned tubes, so in that way, by using extended surfaces to enhance the heat exchange can reduce the total number of tubes from 60 to 12. For the case of using the AB2-type material as the operating hydride the performance of the extended surfaces is more dominant and more effective comparing to the case of using the embedded tubes, especially for the case of the longitudinal extended surfaces.

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Experimental research on refrigeration characteristics of a metal hydride heat pump in auto air-conditioning

Cited by 51 publications

References 10 publications

Modelling and analysis of a metal hydride cooling system

Modelling and analysis of a metal hydride cooling system

Studies on La based intermetallic hydrides to determine their suitability in metal hydride based cooling systems

Efficient hydrogen storage in up-scale metal hydride tanks as possible metal hydride compression agents equipped with aluminium extended surfaces

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