Heat energy recovery apparatus

A heat energy recovery apparatus, comprising:

• a compressor which has a piston for compressing sucked-in working gas;
• a heat exchanger which makes the working gas compressed by the compressor absorb heat of high temperature fluid;
• an expander which has a piston to be moved under pressure by expansion of the heat-absorbed working gas;
• a working gas exhaust pipe which leads the working gas compressed by the compressor to the heat exchanger;
• a working gas exhaust path, generally parallel to a direction of the thermal expansion of the heat exchanger, which is provided on at least one portion of the working gas exhaust pipe;
• a first extending unit, extensible in the same direction as that of the thermal expansion when the heat exchanger expands thermally and tensile stress occurs in the working gas exhaust path with the thermal expansion of the heat exchanger, which is provided on the working gas exhaust path;
• and
• a first shrinking unit, shrinkable in the same direction as that of the thermal expansion when the heat exchanger expands thermally and compressive stress occurs in the working gas exhaust path with the thermal expansion of the heat exchanger, which is provided on the working gas exhaust path.