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
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.