论文信息 - Analytical Study on the Heating Performance Improvement of a CO 2 Heat Pump Using Vapor Injection

Analytical Study on the Heating Performance Improvement of a CO 2 Heat Pump Using Vapor Injection

ABSTRACT: In this study, a simulation model for a CO 2 heat pump using vapor injection was developed and validated. It was used to predict the improvement of the heating performance of the CO 2 heat pump at various operating conditions. The simulation results showed consistent results with the measured data. The heating performances of the vapor injection and non-injection heat pumps were compared by varying the outdoor temperature and compressor frequency. The heating capacity of the vapor injection heat pump was 40% higher than that of the non-injection heat pump at the outdoor temperature of -8℃. The performance of the vapor injection heat pump was consistently higher than that of the non-injection heat pump even when the compressor frequency was reduced to 35 Hz at the outdoor temperature of -3℃.Keywords: CO 2 heat pump(이산화탄소 열펌프), Vapor injection(가스인젝션), Simulation(시뮬레이션) †Corresponding author Tel.: +82-2-3290-3366; fax: +82-2-921-5439 E-mail address: yongckim@korea.ac.kr 기 호 설 명

[1] Chi-Chuan Wang,et al. A generalized heat transfer correlation for Iouver fin geometry , 1997 .

[2] J. Thome,et al. New prediction methods for CO2 evaporation inside tubes: Part I – A two-phase flow pattern map and a flow pattern based phenomenological model for two-phase flow frictional pressure drops , 2008 .

[3] Chi-Chuan Wang,et al. A generalized friction correlation for louver fin geometry , 2000 .

[4] Jahar Sarkar,et al. Optimization of two-stage transcritical carbon dioxide heat pump cycles , 2007 .

[5] J. Thome,et al. New Prediction Methods for CO2 Evaporation Inside Tubes: Part II - An Updated General Flow Boiling Heat Transfer Model Based on Flow Patterns , 2008 .

[6] Eckhard A. Groll,et al. New correlation to predict the heat transfer coefficient during in-tube cooling of turbulent supercritical CO2 , 2002 .

[7] R. Winterton,et al. Technical notes: where did the Dittus and Boelter equation come from , 1998 .

[8] Kim Yongchan,et al. Simulation Study on the Performance Improvement of a $CO_2$ System Applying a Two-stage Phase-separate Cycle , 2006 .

[9] Marco Corradi,et al. Two-stage transcritical carbon dioxide cycle optimisation: A theoretical and experimental analysis , 2005 .

[10] J. Thome,et al. Condensation in horizontal tubes, part 2: new heat transfer model based on flow regimes , 2003 .

[11] L. Friedel. Improved Friction Pressure Drop Correlation for Horizontal and Vertical Two-Phase Pipe Flow , 1979 .