A comparison of an analytical and numerical flow model for the lubrication system of a variable speed hermetic compressor

Özsipahi M., Cadirci S., Gunes H., Sarioglu K.

Isi Bilimi Ve Teknigi Dergisi/ Journal of Thermal Science and Technology, cilt.36, sa.2, ss.41-49, 2016 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 36 Sayı: 2
  • Basım Tarihi: 2016
  • Dergi Adı: Isi Bilimi Ve Teknigi Dergisi/ Journal of Thermal Science and Technology
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, TR DİZİN (ULAKBİM)
  • Sayfa Sayıları: ss.41-49
  • Anahtar Kelimeler: Variable capacity hermetic compressor, Lubrication, Screw pump, Analytical flow model, Computational Fluid Dynamics (CFD), RECIPROCATING-COMPRESSOR, FLUID-FLOW, PUMP
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

This study presents an analytical flow model for the screw pump and compares it with the numerical simulations for the lubrication system of a variable speed hermetic reciprocating compressor used mainly in household refrigerators. Since variable capacity compressors (VCC) can be operated at different rotational speeds, a sufficient lubrication is required even at low rotational speeds where centrifugal effects are at a minimum. The lubrication system of such compressors includes a screw pump inside their crankshaft for this purpose. Using the analytical flow model, effects of the main design parameters for the screw pump to maximize the mass flow rate of the lubricant released from the upper part of the crankshaft are predicted and compared with numerical results. Specifically, the effects of the rotational speed, the oil viscosity, the submersion depth of the crankshaft in the oil sump and screw aspect ratio are investigated in this paper.