International Journal of Air-Conditioning and Refrigeration

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Development of the Dynamic Simulation Program of a Multi-Inverter Heat Pump under Frosting Conditions

  • Park Byung-Duck (School of Mechanical Engineering, Sangju National University) ;
  • Lee Joo-Dong (Samsung Electronics Co. Ltd, Air Conditioning R&D Team) ;
  • Chung Baik-Young (LG Electronics Inc., Digital Appliance Research Laboratory)
  • Published : 2004.09.01
Download PDF
⟨ Previous Next ⟩

Abstract

In case of heat exchangers operating under frosting condition, the thermal resistance and the air-side pressure loss increase with a growth of frost layer. In this paper, a transient characteristic prediction model of the heat transfer for a multi-inverter heat pump with frosting on its surface was presented by taking into account the change of the fin efficiency due to the growth of the frost layer. This dynamic simulation program was developed for a basic air conditioning system composed of an evaporator, a condenser, a compressor, a linear electronic expansion valve, and a bypass circuit. The theoretical model was derived from measured heat transfer and mass transfer coefficients. We also considered that the heat transfer performance was only affected by the decrease of wind flow area. The calculated results were compared with the experimental results for frosting conditions.

Keywords

References

  1. Park, B. D., Chung, B. Y, Ha, D. Y and Im, K S., 1998, Development of simulation program for multi-airconditioner, Summer Conference of SRAEK, pp. 1370-1375.
  2. Park, B. D., Lee, J. D., Koyama, Sh., Hwang, I.N., Chang, S. D. and Chung, B. Y, 2001, Development of the dynamic simulation program for the multi-inverter heat pump airconditioner, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol.13, No. 11, pp. 1079-1088.
  3. Aoki, K, 1986, Frost formation and defrosting for heat pump systems, Trans. of the JAR, Vol. 3, No.2, pp. 1-9
  4. Aoki, K. and Hattori, M., 1990, Heat exchanger operating with frosting, Japanese Journal of Refrigeration, Vol. 65, No. 758, pp.42-47
  5. Aoki, K, 1989, Characteristic on heat pump system due to frosting, Japanese Journal of Refrigeration, Vol. 64, No. 742, pp.917-923
  6. Kim, C. H., Shin, J. M. and Ha, S. C., 2002, A study of frost formation on different hydrophilic surface, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No.6, pp.519-524.
  7. Choi, B.J. and Shin, J. M., 2002, The frost and defrost performance of fin-and-tube exchangers with different surface characteristics, Korean Journal of Air-Conditioning and Refrigeration Engineering, Vol. 14, No.6, pp. 525-530
  8. Aoki, K, Hattori, M. and Akiyoshi, K., 1990, Characteristics of heat pump cycle with frosting, Proceeding of the 24th JAR, pp.57-60
  9. Okawa, K., Tanaka, N. and Yoshino, Y. 1988, Analysis of heat and mass transfer of air cooling heat exchanger with frosting, Proceeding of the 22th JAR, pp. 49-52
  10. Ishihara, I., 1978, A study on heat transfer under frosting conditions, Ph.D. thesis, Kansai University, Osaka, Japan
  11. KSI, 1999, KSC9306, air conditioner, p.44