Free-piston vuilleumier heat pump
US5615556A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 5, 1995 |
| Grant date | Apr 1, 1997 |
| Priority date | — |
| Expiry date | Jun 5, 2015 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02G2250/18
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
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).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.