POWER CONVERSION APPARATUS WITH SMALL TEMPERATURE DIFFERENCE

PROBLEM TO BE SOLVED: To provide a power conversion apparatus with a small temperature difference, which can be driven with an extremely small temperature difference.SOLUTION: The conversion apparatus includes: at least two sealed vessels charged with a liquefied high-pressure gas in a gas-liquid mixture state; a heat source unit for separately cooling or heating the sealed vessels; a reciprocal driving means communicating the heated sealed vessel and connected through a flow channel changing means; a gas phase flow channel connecting the flow channel changing means and the cooled sealed vessel together; and a liquid phase flow channel connecting the heated sealed vessel and the cooled sealed vessel together. The flow channel changing means and the reciprocal driving means are heated at an approximately equal temperature to that of the sealed vessel heated by the heat source unit.