Free-piston vuilleumier heat pump

Details Free-piston vuilleumier heat pump Free-piston vuilleumier heat pump

1995-06-05

1997-04-01

Capossela, Ronald C.

Refrigeration

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

60520, F25B 900

Patent

active

056155565

ABSTRACT:
A free-piston Vuilleumier heat pump in which displacers having a spring-operated resonance system, controls the heating energy and cooling energy outputs by controlling strokes of a hot displacer and a cold displacer. The control of the displacer strokes is performed by controlling the working gas temperature in a hot working space. Furthermore, the control of the displacer strokes may be performed by controlling a motor output while keeping the operation frequency of the motor mounted for at least one of the hot displacer and the cold displacer, in the vicinity of a resonance frequency which is determined by the driving system of the hot displacer and the cold displacer. Even in the free-piston Vuilleumier heat pump using the spring-operated resonance system thus constituted for reciprocating motion, a fine output adjustment is carried out in accordance with heating and cooling loads and therefore it is possible to control to change the working gas temperature in the high-temperature section, thus obtaining a stable operating condition and a high coefficient of performance (COP).

REFERENCES:
patent: 4969333 (1990-11-01), Osawa et al.
patent: 5435140 (1995-07-01), Ishino et al.
patent: 5483802 (1996-01-01), Karawajiri et al.
H. Carlsen "Development of a Gas Fired Vuilleumier Heat Pump For Residential Heating" IEEE 1989.

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