Turbocompresseurs de petite taille pour un fonctionnement sur une large plage avec des jeux radiaux importants pour un concept de pompe à chaleur bi-étagée

Translated title of the contribution: Small-scale turbocompressors for wide-range operation with large tip-clearances for a two-stage heat pump concept

Adeel Javed, Cordin Arpagaus, Stefan Bertsch, Jürg Schiffmann

Research output: Contribution to journalArticlepeer-review

22 Citations (SciVal)

Abstract

Two mechanically driven small-scale turbocompressors running on gas lubricated bearings have been theoretically designed for a 6.5 kW two-stage heat pump functioning under variable operating conditions. The novelty in the heat pump system lies in the application of oil-free turbocompressor technology and the introduction of unused heat from various secondary heat sources. Managing the heat pump operational deviations with the secondary heat is difficult for the turbocompressors. The turbocompressors can potentially exceed their operating range defined by the surge, choke and maximum rotational speed margins. Furthermore, regulating the tip-leakage flow caused by large tip-clearances in small-scale turbomachinery is challenging. This paper will guide the readers through different stages of the design process of small-scale turbocompressors subjected to different operational and design constraints. The design review and the presented methodology will help the designers make suitable parameter selections for achieving high efficiency and wide compressor operating range.

Translated title of the contributionSmall-scale turbocompressors for wide-range operation with large tip-clearances for a two-stage heat pump concept
Original languageFrench
Pages (from-to)285-302
Number of pages18
JournalInternational Journal of Refrigeration
Volume69
Early online date14 Jun 2016
DOIs
Publication statusPublished - 30 Sep 2016
Externally publishedYes

Keywords

  • Computational fluid dynamics (CFD)
  • Optimum blade design
  • Small-scale turbocompressors
  • Tip-clearance effects
  • Two-stage heat pump
  • Two-zone meanline modeling

ASJC Scopus subject areas

  • Building and Construction
  • Mechanical Engineering

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