THERMAL-CONDUCTIVITY OF METAL HYDRIDE MATERIALS FOR STORAGE OF HYDROGEN - EXPERIMENTAL INVESTIGATION

Citation
E. Hahne et J. Kallweit, THERMAL-CONDUCTIVITY OF METAL HYDRIDE MATERIALS FOR STORAGE OF HYDROGEN - EXPERIMENTAL INVESTIGATION, International journal of hydrogen energy, 23(2), 1998, pp. 107-114
Citations number
33
Categorie Soggetti
Energy & Fuels","Physics, Atomic, Molecular & Chemical
ISSN journal
03603199
Volume
23
Issue
2
Year of publication
1998
Pages
107 - 114
Database
ISI
SICI code
0360-3199(1998)23:2<107:TOMHMF>2.0.ZU;2-G
Abstract
The effective thermal conductivity of a powdery material, comprising h eal conduction in the solid particles and in gas and temperature radia tion across the pores, was determined by the transient hot wire method . The materials investigated were LaNi4.7Al4.7Hx, which is practically applied at medium temperature, and HWT 5800, applied at low temperatu res. The temperature range investigated was -80 to +140 degrees C, the pressure range 10(-6) to 60 bar. The porosity of the powder material in the state of delivery was 0.045 and 0.531. Concentratiop/pressure i sotherms (CPI) and the effective thermal conductivity k(eff) were meas ured. Various filling gases (H-2, He, N-2, Ar) were used. There is a c lear effect of the gas in the slate of delivery of the powder. An effe ct of particle decay can be observed. The effective thermal conductivi ty depends primarily on the hydrogen pressure, while the temperature h as only an indirect influence. (C) 1997 International Association for Hydrogen Energy.