Power plants – Motor operated by expansion and/or contraction of a unit of... – Mass is a solid
Patent
1989-09-05
1991-06-25
Ostrager, Allen M.
Power plants
Motor operated by expansion and/or contraction of a unit of...
Mass is a solid
60528, 60530, F02G 706
Patent
active
050256270
ABSTRACT:
A piston (14) is slidably received in a chamber (10). The chamber is filled with an expandable medium (16), such as wax, that expands and contracts significantly as it undergoes a phase change from a solid to a liquid state. A Peltier effect chip (20) selectively adds and removes heat energy from the chamber, hence the medium, to cause the medium to change phase. A temperature control (26) maintains the temperature of the medium substantially at the phase change temperature such that the addition of heat causes an isothermal melting (hence, expansion) and the removal of heat causes an isothermal solidification (hence, contraction). The chamber defines a plurality of thin branches (42) such that the heat is transferred more effectively.
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