| 摘要 |
PURPOSE:To make an efficient use of heat of a small temperature difference and to achieve saving of natural resources, by causing a cycle of adiabatic compression and adiabatic expansion in a container isolated from the outside, and taking out the thermal change as work by use of a substance like a shape memory alloy. CONSTITUTION:A piston 3 is disposed in a cylinder 1 having a heat-insulating material 2 applied to the inner surface thereof in the manner that it is freely reciprocable in the cylinder 1, and the inside of the cylinder 1 is isolated thermally from the outside. A cooling medium 11 such as Freon gas and nitinol wires 4 made of a shape memory alloy which is corrugated at a low temperature and becomes straight at a high temperature, stacked in a multiplicity of layers, are placed in the cylinder 1. One end of each nitinol wire 4 is fixed to fixing member 5 while the other end is fixed to a fixing member 7 attached to a sliding shaft 6. Further, a heat exchanger 8 is disposed in the cylinder 1 at the lower portion of the layer of nitinol wires 4 so as to impart or absorb heat to and from the heating medium passed through the inside of a pipe 9. Further, a fan 10 is provided for making the temperature in the system uniform promptly. |
