Heat exchanger

摘要

A heat exchanger which includes a turbulence promoter interposed between inlet and outlet ports of the heat exchanger and spring means made of a memory alloy for moving the turbulence promoter in a predetermined direction. The area of the heat transfer surface in which the heat transfer coefficient or the unit thermal conductance is increased by the turbulence promoter is changed in accordance with movement of the turbulence promoter. As a result, the heat exchanger effectiveness or temperature effectiveness is intentionally changed and the temperature at the outlet port of the heat exchanger is maintained within a certain range of temperature.