Effective heat transfer in a metal-hydride-based hydrogen separation process

Fleming, William H.; Khan, Jamil A.; Rhodes, C.A.

doi:10.1016/s0360-3199(00)00129-4

Cited by 28 publications

(6 citation statements)

References 8 publications

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“…However, k L turned out to be a weak function of flow rate, most likely because in all cases near equilibrium conditions prevailed as indicated by the mass-transfer driving force always being very small (i.e., φ* − φ ∼ 0 in eq 17). It was also observed that the model predictions were very sensitive to the magnitude of the heat-transfer coefficient, possibly indicating that the discharge process was heat-transfer-limited, similar to that reported elsewhere for metal hydride beds . The factor of 2 difference in the h 's from the MV and CL models was most likely caused by the difference in the plateau heat of adsorption for the two P − C − T models.…”

Section: Resultssupporting

confidence: 79%

“…It was also observed that the model predictions were very sensitive to the magnitude of the heat-transfer coefficient, possibly indicating that the discharge process was heat-transfer-limited, similar to that reported elsewhere for metal hydride beds. 23 The factor of 2 difference in the h's from the MV and CL models was most likely caused by the difference in the plateau heat of adsorption for the two P-C-T models.…”

Section: Resultsmentioning

confidence: 98%

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Practical Modeling of Metal Hydride Hydrogen Storage Systems

Gadre

Ebner

Al‐Muhtaseb

et al. 2003

Ind. Eng. Chem. Res.

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A new approach is introduced to model the discharge behavior of a metal hydride hydrogen storage bed. The reversible reaction kinetics and the empirical van't Hoff relationship used in a typical reactor model are replaced by a solid-phase diffusion equation and a semiempirical equilibrium P−C−T relationship. Two new semiempirical P−C−T models are also introduced based on modified virial and composite Langmuir expressions. By varying the heat- and mass-transfer coefficients, the model was calibrated to experimental pressure and temperature histories obtained from a commercially viable metal hydride bed containing Lm1.06Ni4.96Al0.04. Overall, the results of this study showed that a fairly simple numerical model can do a reasonable job in predicting the discharge behavior of a fairly complicated metal hydride hydrogen storage bed over a wide range of hydrogen flow-rate demands. The extreme theoretical limits of isothermal equilibrium (analytical model), adiabatic equilibrium, nonadiabatic equilibrium, isothermal nonequilibrium, and adiabatic nonequilibrium conditions were also studied and compared to the actual behavior under nonadiabatic nonequilibrium conditions. These limiting cases revealed that the metal hydride hydrogen storage vessel was definitely heat-transfer-limited and only minimally mass-transfer-limited over a wide range of hydrogen discharge flow rates.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 98%

Practical Modeling of Metal Hydride Hydrogen Storage Systems

Gadre

Ebner

Al‐Muhtaseb

et al. 2003

Ind. Eng. Chem. Res.

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“…Heat exchangers are used in a wide variety of applications including power plants, nuclear reactors, refrigeration and airconditioning systems, automotive industries, heat recovery systems, chemical processing, and food industries [1][2][3]. Besides the performance of the heat exchanger being improved, the heat transfer enhancement enables the size of the heat exchanger to be considerably decreased.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer coefficients of shell and coiled tube heat exchangers

Salimpour

2009

Experimental Thermal and Fluid Science

198

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“…due to their high heat and mass transfer rates and compact structures [1][2][3][4].Compared to the straight tube, the helically coiled tube has many advantages. First, the heat and mass transfer rate of helically coiled tube is higher than that of the straight tube due to the secondary flow normal to the flow direction which is induced by the centrifugal force [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on turbulent heat transfer of carbon dioxide in a helically coiled tube

Wang

Zhang

et al. 2013

2013 International Conference on Materials for Renewable Energy and Environment

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Experimental investigations on turbulent heat transfer of carbon dioxide in a helically coiled tube were performed under constant wall heat flux conditions. A computational program was compiled in a helical coordinate system to calculate the inner wall temperatures based on the directly measured outer wall temperatures by thermocouples. It was found that the wall temperatures increased with the increasing heat flux and the decreasing mass flux, while the heat transfer coefficients increased with the increasing heat flux and mass flux. The circumferential temperature and heat transfer coefficient distributions for a fixed cross section displayed the non-uniform character. Generally, the outer side had a relatively lower temperature and higher heat transfer coefficient than the inner side due to the secondary flow induced by the centrifugal force.

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Effective heat transfer in a metal-hydride-based hydrogen separation process

Cited by 28 publications

References 8 publications

Practical Modeling of Metal Hydride Hydrogen Storage Systems

Practical Modeling of Metal Hydride Hydrogen Storage Systems

Heat transfer coefficients of shell and coiled tube heat exchangers

Experimental investigations on turbulent heat transfer of carbon dioxide in a helically coiled tube

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