Browse > Article
http://dx.doi.org/10.6110/KJACR.2011.23.1.073

An Experimental Study on Correlation between Oil Discharge and Various Operating Conditions of a CO2 Compressor  

Lee, Ik-Soo (Graduate School, Kookmin University)
Kang, Byung-Ha (School of Mechanical Eng., Kookmin University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.23, no.1, 2011 , pp. 73-79 More about this Journal
Abstract
A portion of oil for lubrication of compressor flows together with refrigerant in the refrigeration system. If the oil discharge from a compressor is increased in the refrigeration system, not only pressure drop is increased in other components, such as evaporator and gas cooler, but also heat transfer coefficient in the heat exchangers is decreased. Oil discharge rate from a compressor may strongly depend on operating conditions of a compressor. In this study, one stage single rotary compressor is employed for measuring oil circulation ratio(OCR). Carbon dioxide and PAG oil are used as refrigerant and lubricant. Using a U-tube densimeter, mixture density is measured. Oil circulation ratio(OCR) can be estimated by measured mixture density. The results obtained indicate that the oil circulation ratio(OCR) is increased as the suction temperature or compressor operating frequency is increased. Oil circulation ratio(OCR) correlation of the compressor is also suggested.
Keywords
Oil Circulation Ratio; PAG oil; Density; Carbon dioxide;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Kim, S. H., Kim, C. N. and Park, Y. M., 1999, An investigation on the in si-tu measurement of the oil-concentration with densimeter, The Society of Air-Conditioning and Refrigerating Engineers of Korea, Vol. 11, pp. 31-37.
2 Min, M. K, Hong, K. S., Hwang, Y. J., Hwang, I. N., Kim, C. M., and Cho, K S., 2000, An experimental study on the oil circulation in an inverter-driven heat pump, The Society of Air-Conditioning and Refrigerating Engineers of Korea, Vol. 12, pp. 717-724.
3 Cho, P. J., Lee, S. K, Youn, Y, and Ko, H. S., 2005, Analysis of oil behavior inside upper part of rotary compressor using visualization technique, The Society of Air-Conditioning and Refrigerating Engineers of Korea, Vol. 17, No.8, pp. 772-779.
4 Toyama, T., Matsuura, H. and Yoshiaki Yoshida, Y., 2006, Visual techniques to quantity behavior of oil droplets in a scroll compressor, The 18th International Compressor Engineering Conference at Purdue, C026, pp. 1-7.
5 Dreimen, N. and Bunch, R., 2006, Development of carbon dioxide rotary compressor, The 18th International Compressor Engineering Conference at Purdue, C0l4, pp. 1-8.
6 Navarro, E., Urchueguia, J. F., Gonzalvez, J., and Corberan, J. K., 2005, Test result of performance and oil circulation rate of commercial reciprocating compressors of different capacities working with propane(R290) as refrigerant, International Journal of Refrigeration, Vol. 28, pp. 881-888.   DOI   ScienceOn
7 Ogata, T., Hasegawa, H., Okaichi, A., and Nishiwaki, F., 2006, Reduction of oil discharge for rolling piston compressor using $CO_{2}$ refrigerant, The 18th International Compressor Engineering Conference at Purdue, C095, pp. 1-7.
8 Christen, T., Hubacher, B., Bertsch, S. S., and Groll, E., 2006, Experimental performance of prototype carbon dioxide compressors, The 18th International Compressor Engineering Conference at Purdue, C131, pp. 1-10.
9 Lemmon, E. W., McLinden, L. O., and Friend, D. G., in Linstrom, P. J. and Mallad, W. G. (Ed.), 2001, NIST Chemistry WebBook, NIST Standard Refrence Database Number 69, NIST, Gaitherbug, MD, http://webbook.nis.gov.