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A simplified dynamic model for the prediction of displacer's free stroke in Hofbauer cycle machine.

Author(s) : GUAN J., ZHANG L., YANG J., LIU J., LUO B., HUANG Y., HOFBAUER P.

Type of article: IJR article

Summary

Hofbauer cycle machine is one promising technology for heating. It has many advantages compared to conventional Vuilleumier machines due to its non-continuous motions. However, its non-continuous motions also bring challenges for control. In this work, a simplified dynamic model is proposed to predict the free stroke for control. Based on assumption of a mass-spring system for the displacers, a simplified solution is deduced. The simplified solution is based on constant position of pressure balance points and a linear change of gas mass in the working chamber. Experiments on a prototype machine were carried out to validate the model. Motions of displacers are analyzed and causes for abnormal motions are revealed. Then, the predicted free stroke is obtained based on the simplified model and compared with the measured results. The relative error is in the range of -2.45% ∼ +3.02%. Thus, the simplified model could provide a reference for quick control in Hofbauer cycle machines.

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Details

  • Original title: A simplified dynamic model for the prediction of displacer's free stroke in Hofbauer cycle machine.
  • Record ID : 30029105
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 131
  • Publication date: 2021/11
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2021.08.005
  • Document available for consultation in the library of the IIR headquarters only.

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