Heat transfer characteristics in an adsorption heat pump (AHP) using a pack
ed silica gel module (PS-module) were experimentally studied on the basis o
f results compared with those for the AHP with a direct heat exchange modul
e (DS-module) type adsorber. Ultimate heat transfer enhancement for an adso
rber of AHP is almost achieved by using the PS-module because of high packi
ng density and thermal conductivity, and the possibility of its application
to a refrigerator for producing low temperature cold heat energy is sugges
ted.