Energy harvesting heat engine

A rotary heat engine comprising:

• a central crankshaft having a first end and a second end defining an axis of rotation, the central crankshaft further including at least one piston attachment member having an offset axis which is offset from the axis of rotation, with at least one axially displaced coupling point about the offset axis;
• a plurality of cylinder assemblies coupled to the central crankshaft, each cylinder assembly comprising:
• a base member having an opening extending therethrough and a cylinder crown defining a volume, with a diaphragm extending across the opening of the cylinder separating the volume from the cylinder;
• a piston positioned within the cylinder and having a face positionable in abutment with the diaphragm, the piston being directable into the cylinder crown, with a piston shaft extending from a back side of the piston;
• a force transfer member having a first end pivotably coupled to the base member, with a first end of connecting rod pivotably coupled to a second end of the force transfer member, and a second end of the connecting rod coupled to the at least one piston attachment member, with the piston shaft being pivotably coupled to the force transfer member between the first end and the second end thereof;
• a heat exchanger assembly coupled to each of the plurality of cylinder assemblies, each heat exchanger assembly comprising a body defining a heat exchanger volume with an inlet, the inlet in fluid communication with the volume of the cylinder crown, the heat exchanger volume having a refrigerant positioned therein.