This invention provides a
heat engine based on the well-developed structure of internal
combustion engines. The
heat engine comprises at least a
piston and cylinder
assembly and at least two heating chambers associated with said
piston and cylinder
assembly to provide a significantly increased time period for
heat transfer from a heat source to the gaseous working of the engine without increasing the number of strokes per
power stroke in a cycle. Each said heating chamber has therewithin a
heat exchanger unit that facilitates
heat transfer from the heating source to the
working fluid, such as air, substantially under a constant volume, a port leading to said cylinder space, and a heating-chamber valve, said
valve opening or closing the port to establish or block communication between said heating chamber and cylinder space. For a
heat engine utilizing intake and
discharge strokes respectively for intake and
discharge purposes, each said heating chamber in a cycle has an associated intake
stroke, a compression
stroke, a
power stroke, a
discharge stroke, and between said compression and power strokes a time period of 4(n−1) strokes available for
heat transfer from the heat source to the
working fluid enclosed within said heating chamber while the
piston serves the
working fluid associated with another heating chamber, where n is the number of the heating chambers per piston / cylinder
assembly. For a heat engine utilizing a
scavenging process for intake and discharge purposes, each said heating chamber in a cycle has an associated
scavenging process to facilitate the discharge and intake of the working fluid, a compression stroke, a
power stroke, and between said compression and power strokes a time period of 2(n−1) strokes available for heat transfer from the heat source to the working fluid enclosed within said heating chamber while the piston serves the working fluid associated with another heating chamber, where n is the number of the heating chambers per piston and cylinder assembly. Additionally, a heat engine based on a rotary
internal combustion engine as well as the techniques using heat pipes to cool a
rotary engine is disclosed.