METHOD AND DEVICE OF THERMAL TRANSFORMATION

PURPOSE:To raise the amount of thermal transformation per unit amount of metal and to obtain a larger temperature rise width and at the same time present a thermal transformation method of high heat utilization efficiency by providing between a high hydrogen pressure process and low hydrogen pressure process a process to change high hydrogen pressure to an intermediate pressure and/or between a low hydrogen pressure process and high hydrogen pressure process a process to change the low pressure hydrogen pressure to an intermediate pressure. CONSTITUTION:Vessels 10 and 30 contain hydrogen storage metal M1 for hydrogen pressure transformation in their insides, and vessels 20 and 40 contain hydrogen storage metal M2 for heat exchange in their insides. Vessels 10 and 20 are connected by a hydrogen passage 50 and constitute a first system for heat exchanger and likwise vessels 30 and 40 and a hydrogen passage 60 constitute a second system. Both systems are sequence-controlled. In both systems high hydrogens pressure process and low hydrogen pressure process are successively and repeatedly conducted, but in this case when in one system the high hydrogen pressure process is being conducted, the low hydrogen pressure process is done in the other system. A process to change the pressure of the residual hydrogen to an intermediate pressure between the low pressure and the high pressure for the low hydrogen pressure process and the high hydrogen pressure process, called process to change residual hydrogen pressure to intermediate pressure, is provided.