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Refrigerant-Oil Flow at the Compressor Discharge
Technical Paper
2016-01-0247
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
Automotive air conditioning compressor produces an annular-mist flow consisting of gas-phase refrigerant flow with oil film and oil droplets. This paper reports a method to calculate the oil retention and oil circulation ratio based on oil film thickness, wave speed, oil droplet size, oil droplet speed, and mass flow rate. Oil flow parameters are measured by high-speed camera capture and video processing in a non-invasive way. The estimated oil retention and oil circulation ratio results are compared quantitatively with the measurements from system experiments under different compressor outlet gas superficial velocity. The agreement between video result and sampling measurement shows that this method can be applied in other annular-mist flow analysis. It is also shown that most of the oil exists in film from the mass point of view while oil droplets contributes more to the oil mass flow rate because they travel in a much higher speed.
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Citation
Xu, J. and Hrnjak, P., "Refrigerant-Oil Flow at the Compressor Discharge," SAE Technical Paper 2016-01-0247, 2016, https://doi.org/10.4271/2016-01-0247.Also In
References
- Nidegger , E. , Thome J. , and Favrat D. Flow Boiling and Pressure Drop Measurements for R-134a/Oil Mixtures Part 1: Evaporation in a Microfin Tube HVAC&R Research 1997 3 1 38 53
- Zürcher , O. , Thome J.R. , and Favrat D. In-tube flow boiling of R-407C and R-407C/Oil Mixtures Part II: Plain tube results and predictions HVAC&R Research 1998 4 4 373 399
- Li , H. and Hrnjak , P. Lubricant Effect on Performance of R134a MAC Microchannel Evaporators SAE Technical Paper 2014-01-0692 2014 10.4271/2014-01-0692
- Li , H. and Hrnjak , P. Effect of Flow Regime in the Horizontal Inlet Header on Refrigerant-Oil Mixture Distribution in a MAC Microchannel Evaporator SAE Technical Paper 2014-01-0701 2014 10.4271/2014-01-0701
- Li , H. and Hrnjak , P. An Infrared Thermography Based Method for Quantification of Liquid Refrigerant Distribution in Parallel Flow Microchannel Heat Exchanger SAE Int. J. Mater. Manf. 8 3 603 608 2015 10.4271/2015-01-0357
- Li , J. and Hrnjak , P. Phase Separation in Second Header of MAC Condenser SAE Technical Paper 2015-01-1694 2015 10.4271/2015-01-1694
- McMullan , J. et al. The influence of oil viscosity and refrigerant quality on evaporator performance International journal of energy research 1992 16 7 567 581
- McMullan , J. , Murphy N. , and Hughes D. The effect of oil on the performance of heat pumps and refrigerators-II. Experimental results Heat Recovery Systems and CHP 1988 8 2 95 124
- Zimmermann , A.J. and Hrnjak P.S. Oil flow at discharge valve in a scroll compressor Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 2014 229 2 104 113
- Zimmermann , A.J.P. and Hrnjak P.S. Visualization of the Opening Process of a Discharge Reed Valve in the Presence of Oil 22nd International Compressor Engineering Conference 2014 Purdue University
- Wujek , S. Mist to Annular Flow Development Quantified by Novel Video Analysis Methods Department of Mechanical Science and Engineering 2011 Univerisity of Illinois at Urbana-Champaign Urbana
- Wada , A. A Novel Approach to Instrumentation and Application for OCR Measurement International Compressor Engineering Conference 1992 Purdue University
- Shedd , T.A. Characteristics of the Liquid Film in Horizontal Two-Phase Flow Department of Mechanical Science and Engineering 2001 University of Illinois at Urbana-Champaign Urbana
- Shedd , T.A. and Newell T.A. Automated optical liquid film thickness measurement method Review of Scientific Instruments 1998 69 12 4205
- Sarntichartsak , P. et al. Simulation and experimental evaluation of the effects of oil circulation in an inverter air conditioning system using R-22 and R-407C Applied thermal engineering 2006 26 14 1481 1491
- Hurlburt , E.T. and Newell T.A. Prediction of the circumferential film thickness distribution in horizontal annular gas-liquid flow Journal of fluids engineering 2000 122 2 396 402
- Wujek , S. et al. Method for Measuring Oil Contained in Air-Conditioning Components International Refrigeration and Air Conditioning Conference 2010 Purdue University
- Koh , K.U. , Kim J.Y. , and Lee S.Y. Determination of in-focus criteria and depth of field in image processing of spray particles Atomization and Sprays 2001 11 4