부산대학교 도서관

Metal hydride heat pump (MHHP) shows low cooling performance due to the low effective thermal conductivity of metal hydrides (MH) particle bed. In this paper, aiming at improving the heat transfer of MH particle bed as well as enhancing the operating characteristic of the MHHP system, the metal hydride sheet (MH sheet), which consists of MH powder, aramid pulp (AP) and carbon fiber (CF), was inserted into the metal hydride reactor. The effective thermal conductivity was measured and the effects of the mass ratio were also studied. It was found that besides the share of carbon fiber, the stiffness of sheet was also an important factor, especially in the high-pressure situation. Additionally, with the application of the proposed MH sheet, a small MHHP model was established and its cooling power was evaluated to identify the influence of MH sheet on heat and mass transfer. It was indicated the selected MH sheet did accelerate the rate of heat transfer in each reactor during regeneration and cooling processes.