Reduction of the suction losses through reed valves in hermetic reciprocating compressors using a magnet coil

Johann Wilfried Hopfgartner, Stefan Posch, Bernhard Zuber, Raimund Almbauer, Klaus Krischan, Stefan Stangl

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review

Abstract

Reed valves are widely used in hermetic reciprocating compressors and are responsible for a large part of the thermodynamic losses. Especially, the suction valve, which is opened nearly during the whole suction stroke, has a big potential for improvement. Usually, suction valves are opened only by vacuum created by the moving piston and should be closed before the compression stroke starts to avoid a reversed mass-flow through the valve. Therefore, the valves are prestressed, which results on the other hand in a higher flow resistance. In this work, a suction valve is investigated, which is not closed by the preload of the valve but by an electromagnetic coil located in the suction muffler neck. Shortly before the piston reaches its bottom dead centre, voltage is applied to the coil and a magnetic force is generated which pulls the valve shut. Thereby, the flow resistance through the valve can be reduced by changing the preload on the reed valve because it is no longer needed to close the valve. The investigation of this adapted valve and the electromagnetic coil is firstly done by numerical simulations including fluid structure interactions of the reed valves of a reciprocating compressor and secondly by experiments made on a calorimeter test bench.
Original languageEnglish
Title of host publicationProceedings of the International Conference on Compressors and their Systems 2017, London, GB
DOIs
Publication statusPublished - 2017
Event10th International Conference on Compressors and Their Systems - London, United Kingdom
Duration: 11 Sep 201713 Sep 2017

Publication series

NameIOP Conference Series: Materials Science and Engineering
Number1
Volume232
ISSN (Electronic)1757-8981

Conference

Conference10th International Conference on Compressors and Their Systems
Country/TerritoryUnited Kingdom
CityLondon
Period11/09/1713/09/17

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