Reciprocating four-stroke Brayton refrigerator or heat engine

Details Reciprocating four-stroke Brayton refrigerator or heat engine Reciprocating four-stroke Brayton refrigerator or heat engine

2007-10-16

2007-10-16

Doerrler, William C (Department: 3744)

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

C060S517000, C062S467000

Reexamination Certificate

active

11089664

ABSTRACT:
A thermal machine that can function as either a refrigerator or an external combustion heat engine is disclosed. A working gas undergoes four thermodynamic processes that comprise a Brayton cycle. Two of these processes, adiabatic compression and adiabatic expansion, take place in the same cylinder, within which a piston, driven by a crankshaft, reciprocates. The remaining two processes, each of which is a transfer of heat at constant pressure, take place in a high pressure heat exchanger and a low pressure heat exchanger. A rotary valve, rotating at one-half crankshaft speed, creates passages between the cylinder and the heat exchangers, and is constructed so that compression and expansion ratios are equal.

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