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Numerical analysis and experimental study on the performance optimization of cold storage heat exchanger integrated with evaporator

  • Daewoong Lee
Article

Abstract

The ISG (Idle Stop and Go) systems are commonly used in modern automobiles because they are economical and environmental friendly technology. However, when a vehicle stops, the air-conditioning system stops, resulting in thermal discomfort to passengers in the cabin. This paper examines a cold storage heat-exchanger (CSH) integrated with an evaporator. The position of the cold storage parts inside a heat exchanger was analyzed through numerical simulations using FLUENT to create an adequate design for a CSH. The CSH performance was then examined with various airflow volumes and optimized experimentally in terms of the refrigerant flow circuit and fin density in the heat exchanger. Next, an experiment on the coldness release performance of the CSH was conducted in the air-conditioning system. The cold storage system with optimized CSH experiment resulted in lower air discharge temperatures (3.5 °C ~ 4.9 °C) than current air-conditioning systems, and delayed the warm-up by approximately 155 seconds to reach 18 °C temperature of air discharge. For this study, the CSH is an effective solution for the ISG-applied vehicles with less investment by transforming current air-conditioners’ structures more effectively.

Key words

Cold storage heat exchanger Cold storage Coldness release Evaporator Fuel economy ISG Latent heat Numerical simulation Phase change material Thermal comfort 

Nomenclature

D

depth (mm)

H

height (mm)

L

length (mm)

air flow volume rate (m3/h)

Pair

air pressure drop (Pa)

Pref

refrigerant pressure drop (kPa)

Qc

cooling capacity (kW)

t

time (s)

T

temperature (°C)

v

velocity (m/s)

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References

  1. Ao, G. Q., Qiang, J. X., Zhong, H., Yang, L. and Zhno, B. (2007). Exploring the fuel economy potential of ISG hybrid electric vehicles through dynamic programming. Int. J. Automotive Technology 8, 6, 781–790.Google Scholar
  2. Cathy, B., Roland, B., Gottfried, D., Guenther, F., Kurt, M., Von, R. G., Wolfgang, S., Brigitte, T. R. and Marcus, W. (2002). Air-conditioning for Automobile. Patent No. JP2002-274165, Behr GMBH.Google Scholar
  3. Craig, T., O’Brien, J., Polisoto, D. and Wolfe, N. (2010). Integrated air-conditioning evaporator with phase change material for thermal storage. SAE Automotive Alternate Refrigerant Systems Symp., 10AARS-022.Google Scholar
  4. Guyonvarch, G., Haller, R. and Lepetit, L. (2003). A comparison between climate control systems providing thermal comfort during vehicle stops. SAE Paper No. 2003-01-1073.Google Scholar
  5. Hans, K. (2002). Heat Exchanger for Air Conditioner for Automobile. Patent No. JP2002-362138, Behr GMBH.Google Scholar
  6. Hwang, J., Heo, H., Bae, S., Lee, D., Choi, H. and Kim, Y. (2010). Numerical evaluation of thermal flow characteristics of louvered fin type heat exchangers. KSAE Annual Conf. Proc., Korean Society of Automotive Engineers, 597–601.Google Scholar
  7. Jeon, Y., Oh, K. and Wang, Y. (2012). Experimental study on cooling performance during ISG mode with cold storage evaporator. KSAE Daejeon and Chungcheong Brench Conf., 12-J0015, 19–25.Google Scholar
  8. Jeon, Y., Oh, K., Jeong, S. and Wang, Y. (2013). Experimental study on cooling effect of cold storage system during ISG mode. KSAE Annual Conf. Proc., Korean Society of Automotive Engineers, 798–804.Google Scholar
  9. Kitamura, K., Shirota, Y. and Takahashi, K. (2004). Vehicle Air-conditioner with Cold Accumulator. Patent No. US 6708512, Denso Corp.Google Scholar
  10. Kline, J. J. and McClintock, F. A. (1953). Describing uncertainties in single-sample experiments. Mechanical Engineering, 75, 3–9.Google Scholar
  11. Kowsky, C., Wolfe, E., Chowdhury, S., Ghosh, D. and Wang, M. (2014). PCM evaporator with thermosiphon. SAE Paper No. 2014-01-0634.Google Scholar
  12. Lee, D. (2015). Experimental study of the effect on cabin thermal comfort for cold storage systems in vehicles. Trans. Korean Society of Automotive Engineers 23, 4, 428–435.CrossRefGoogle Scholar
  13. Lee, D., Keon, D., Chung, S., Jeong, C. and Wang, Y. (2014). Performance investigation of cold storage heatexchanger or vehicle applied ISG. KSAE Annual Conf. Proc., Korean Society of Automotive Engineers, 485–492.Google Scholar
  14. Lee, K. H., Too, M. C. and Baek, N. C. (2013). Thermal storage control for zero-electric demand of low-energy solar house during on-peak period. SAREK Winter Conf., 13-W-075, 1067–1071.Google Scholar
  15. Lee, K. S., Kim, H. J., Baek, C. I., Song, Y. K., Han, C. S. and Kim, D. J. (1996). Numerical analysis on the performance for automobile heat storage system using phase change material. Trans. Korean Society of Automotive Engineers 4, 3, 187–198.Google Scholar
  16. Regine, H., Didier, L., Loic, L. and Christian, P. (2004). Thermal-inertia Heat Exchanger for Automobile Cooling Liquid Circuit. Patent No. JP2004-184071, Valeo Climatisation.Google Scholar
  17. Yamada, A., Nishida, S., Yokoyama, N., Abei, J., Danjo, T., Florida, L., Brodie, B. and Nagano, Y. (2013). Cold storage air conditioning system for idle stop vehicle. SAE Paper No. 2013-01-1287.Google Scholar
  18. Yoon, C. S. and Han, S. (2004). CFD analysis for the flow phenomena of the narrow channels in plate heat exchanger for intercooler. Trans. Korean Society of Automotive Engineers 12, 2, 91–100.Google Scholar
  19. Yoshihiro, I., Yashhiko, N. and Shin, N. (2000). Heat Storage Heat Exchanger Apparatus and Vehicle Air Conditioning Apparatus. Patent No. JP2000-205777, Denso Corp.Google Scholar

Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.R&D DivisionHalla-Visteon Climate Control Corp.DaejeonKorea

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