Adsorption refrigerator driven by waste heat at low temperature and regenerative energy is effective cooling machine at the point of energy saving and global environmental problem. The refrigeration system performance depends on the charactorlistics of adsorption reactor. Experiments were performed for heat and mass transfer in a packed bed of activated carbon fiber adsorbing water vapor or methyl alcohol vapor. The adsorption rate of methyl alcohol vapor, and the rate both methyl alcohol and water vapor decrease as the bed thickness increased. It was confirmed that this reduction attributed to a resistance to heat conduction within the bed. The influence of volumetric rate of bed on adsorption rate was examined. In a compressed carbon fiber bed ,that is a high volumetric rate bed, it was confirmed that the adsorption rate and amount of adsorbed water or methyl alcohol per volume of the bed increased. It suggests the reduction of a reactor size.