A Review on Flow Characteristics of Refrigerant and Oil Mixture in a Heat Pump System

다국어 초록 (Multilingual Abstract)

This paper presents a comprehensive review of oil retention and performance of oil separator in a heat pump system. Liquid volume fraction model, viscous film model and analytical model from continuity and momentum equations for predicting the oil retention amount in a heat pump system are reviewed. In addition, weighing a test section, using an oil injection and extraction device and optical analysis for measuring the oil retention amount are introduced and experimental results are analyzed. Numerical studies which used commercial tools for computational fluid dynamics or suggested a new model by simplifying the flow in cyclone separator are reviewed.
Effects of droplet size and angular velocity of gas phase flow in cyclone separator on the performance are discussed. Experimental methods for measuring the effciency of oil separator are introduced, and theoretical analysis on the effciency and pressure drop of cyclone separator is suggested

참고문헌 (Reference)

1 P. D. Hede, "Two-°uid spray atomisation and pneumatic nozzles for °uid bed coating/agglomeration purposes: A review" 63 : 3821-3842, 2008

2 X. Gao, "The research on the performance of oil-gas cyclone separators in oil injected compressor systems with considering the collision and breakup of oil droplets" 1-10, 2012

3 M. K. Cho, "Study on liquid ¯lm thickness measurement of annular °ow with image processing" Seoul National University 2013

4 V. P. Sheth, "Refrigerant and oil migration and retention in air conditioning and refrigeration systems" Air Conditioning and Refrigeration Center, University of Illinois 2005

5 H. Murakami, "Performance prediction of a cyclone oil separator" 1-8, 2006

6 A. Sethi, "Oil retention and pressure drop of R4123yf and R134a with POE ISO 32 in suction lines" University of Illinois at Urbana-Champaign 2011

7 A. Ramakrishnan, "Oil retention and pressure drop of R134a, R1234yf and R410A with POE 100 in suction lines" 1-10, 2012

8 K. F. Zoellick, "Oil retention and pressure drop in horizontal and vertical suction lines with R410A/POE" 1-8, 2010

9 M. K. Cho, "Numerical investigation on optical analysis for R410A/PVE oil mixture °ow characteristic" 78-79, 2012

10 A. C. Hoffmann, "Gas Cyclones and Swirl Tubes" Springer 2007

11 J. A. Crompton, "Experimental measurement and modeling of oil holdup, air conditioning and refrigeration center" Univ. of Illinois, Urbana-Champaign 2004

12 L. Cremaschi, "Experimental and theoretical investigation of oil retention in vapor compression systems" University of Maryland 2004

13 J. P. Lee, "Experimental and theoretical investigation of oil retention in a carbon dioxide air conditioning system" University of Maryland 2003

14 S. S. Mehendale, "Experimental and theoretical investigation of annular ¯lm °ow reversal in a vertical pipe: Application to oil return in refrigeration systems" 6 : 55-74, 2000

15 Y. Hwang, "An experimental investigation on °ow characteristics of refrigerant/oil mixture in vertical upward °ow" 265-272, 2000

16 A. C. Hoffmann, "An experimental investigation elucidating the nature of the effect of solids loading on cyclone performance" 28 : 188-193, 1991

17 T. A. Shedd, "An automated optical liquid ¯lm thickness measurement method" Air Conditioning and Refrigeration Center, University of Illinois 1997

18 A. H. Lefebvre, "Airblast atomization" 6 : 233-261, 1980

19 "ANSI/ASHRAE 69-1990, Methods of testing discharge line refrigerant-oil separators"

20 H. S. Kim, "A study on the °ow characteristics of refrigerant and oil mixture in compressor suction line" 48 : 48-59, 2014

21 H. S. Kim, "A numerical study on the oil retention in the VRF multi heat pump system" 1-4, 2014