液化ガスを加圧する過程の熱力学的考察

抄録

Liquefied gases are usually transferred by pressurization. The process of pressurization is achieved by heating the liquefied gas or by feeding gas into the container. The gas feeded may be of the same kind with or different from the gas to be pressurized.
In this short note, 1) the process of the pressurization by heating the liquefied gas in the saturated state under the prevailing uniform temperature, 2) the process of pressurization by feeding gas into the container of the liquefied gas in the saturated state under the prevailing uniform temperature, are described first. In the latter problem the gas is of same kind with the liquefied gas but has different temperature and pressure from those of the liquefied gas. Then two worked out examples are shown.
In the examples the liquid helium in the state of saturation under the atmospheric pressure (0.1013 [MPa]) with the dryness fraction between 0 and 0.1 [-] is the initial state before the process of pressurization. The result of calculation for the examples are shown in diagrams, and the procedure to read them and some characteristics of them are described.