Browse > Article

The Cooling Performance Enhancement of a Variable Speed Heat Pump Using Gas Injection Technique  

Jeong, Min-Woo (Department of Mechanical Engineering, Korea University)
Heo, Jae-Hhyeok (Department of Mechanical Engineering, Korea University)
Jung, Hae-Won (Department of Mechanical Engineering, Korea University)
Kim, Yong-Chan (Graduate School of Mechanical Engineering, Korea University)
Publication Information
Korean Journal of Air-Conditioning and Refrigeration Engineering / v.21, no.8, 2009 , pp. 425-432 More about this Journal
Abstract
In this study, the improvement of cooling capacity by applying gas injection technique in a two-stage heat pump using R410A was experimentally investigated. A twin rotary type compressor with gas injection was applied to the heat pump system. The optimum refrigerant charge for the injection and the non-injection cycles was selected to achieve the maximum COP at the cooling standard condition. The injection cycle showed less optimum refrigerant charge than that of the non-injection cycle. The cooling performances of the injection and the non-injection cycles were measured and compared by varying compressor frequency from 40 to 90 Hz. The cooling capacity of the gas injection cycle was 1.6% -11.3% higher than that of the non-injection cycle. The COP of the gas injection cycle was 13.7% to 28.9% higher than that of the non-injection cycle at the same cooling capacity. The heat pump system showed stable operation after 30% of the injection valve opening.
Keywords
Gas injection; Cooling performance; Two-stage cycle; Gas/liquid separator;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 Heo, J. H., Jeong, M. W., Joo, Y. J. and Kim, Y. C., 2008, Effects of gas injecion on the heating performance of a two-stage heat pump with refrigerant charge amount, 9th International IEA Heat Pump Conference
2 Ding, Y. J., Chai, Q. H., G. Y. and Jiang, M. Y., 2004, Experimental study of an improved air source heat pump, Energy Conversion and Management, Vol. 45, No. 15-16, pp. 2393-2403   DOI   ScienceOn
3 Heo, J. H., Jeong, M. W., Jeon, J. U. and Kim, Y. C., 2008, Effect of gas injection on the heating performance of a two-stage heat pump using a twin rotary compressor with refrigerant charge amount, International Journal of Air- Conditioning and Refrigeration, Vol. 16, No. 3, pp. 77-88   ScienceOn
4 Heo. J. H., Jeong, M. W., Kim, B. S., Lee, S. I. and Kim, Y. C., 2008, Effects of various operating conditions of the gas injection cycle on the optimal refrigerant charge, Proceedings of the KSME 2008 Spring Annual Meeting, pp. 70-73
5 Suzuki, T., Ishii, K., Gas-Injection Heat Pump System for Electric Vehicle, 13th International electric vehicle symposium, pp. 245-250
6 KS C 9306, 1999, Air conditioner, Korean Agency for Technology and Standards
7 ASHRAE Guideline 2, 1986, Engineering analysis of experimental data, Atlanta(GA), ASHRAE, USA
8 Lee, H. S., Baek, C. H., Cho, H. H., Kim, Y. C. and Cho, S. W., 2006, Experimental study on the performance improvement of CO2 system with a twin rotary compressor, Proceedings of the SAREK 2006 Winter Annual Conference, pp. 392-397