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A Development of the Correlation for Predicting the Frost Height in Applying Photoelectric Sensors

광센서를 이용한 서리높이 예측 상관식 개발

  • Jeon, Chang-Duk (Dept. of Mechanical Engineering, Korea National University of Transportation)
  • 전창덕 (한국교통대학교 기계공학과)
  • Received : 2015.07.17
  • Accepted : 2015.10.08
  • Published : 2015.10.31

Abstract

In this study, experiments were conducted to investigate the correspondence between the output voltage of the photoelectric sensor and the frost height under heating and defrosting capacity test condition (dry bulb temperature $2^{\circ}C$, wet bulb temperature $1^{\circ}C$) described at KS C 9306, where a real heat exchanger was used as a test rig instead of a large-scale model. A digital microscope and a photoelectric sensor unit consisting of an emitter and a transistor (receiver) were installed in the front of it. A linear correlation is proposed to predict the frost height based on 150 experimental data, approximately 54% of the measured data are consistent with the predicted frost heights within a relative deviation of ${\pm}10%$, it yields good agreement with 90% of the measured data when the frost height larger than 0.3mm with in a relative deviation of ${\pm}10%$. Compared with Xiao's correlation, the slope namely, the change of frost height in accordance with the change of output voltage is consistent within the error of 2.3%. But vertical intercept shows big difference with Xiao's correlation, because it was developed with a large scale model instead of a real heat exchanger.

References

  1. W. Wang, Y. C. Feng, J. H. Zhu, L. T. Li, Q. C. Guo, W. P. Lu, "Performances of air source heat pump system for a kind of mal-defrost phenomenon appearing in moderate climate conditions", Applied Energy, Vol. 112, pp. 1138-1145, 2013. DOI: http://dx.doi.org/10.1016/j.apenergy.2012.12.054 https://doi.org/10.1016/j.apenergy.2012.12.054
  2. J. S. Byun, C. D. Jeon, J. H. Jung, J. Lee, "The application of photo-coupler for frost detecting in an air-source heat pump", Int. Journal of Refrigeration, Vol. 29, pp. 191-198, 2006. DOI: http://dx.doi.org/10.1016/j.ijrefrig.2005.06.008 https://doi.org/10.1016/j.ijrefrig.2005.06.008
  3. R. W. Besant, K. S. Rezkallah, Y. Mao, J. Falk, "Measurement of frost thickness using a laser beam and light meter", ASHRAE Trans. Vol. 96 (1), pp. 519-522, 1990.
  4. Y. Mao, R. W. Besant, H. Chen, "Frost characteristics and heat transfer on a flat plate under freezer operating conditions", ASHRAE Trans. Vol. 99 (1), pp. 231-251, 1999.
  5. Z. L. Liu, H. Y. Wang, X. H. Zhang, S. Meng, C. F. Ma, "An experimental study on minimizing frost deposition on a cold surface under natural convection conditions by use of a novel anti-frosting paint. Part I. Anti-frosting performance and comparison with the uncoated metallic surface", Int. Journal of Refrigeration Vol. 29, pp. 229-236, 2006. DOI: http://dx.doi.org/10.1016/j.ijrefrig.2005.05.018 https://doi.org/10.1016/j.ijrefrig.2005.05.018
  6. J. T. Kwon, H. J. Lim, Y. C. Kwon, S. Koyama, D. H. Kim, C. Kondou, "An experimental study on frosting of laminar air flow on a cold surface with local cooling", Int. Journal of Refrigeration Vol. 29, pp. 754-760, 2006. DOI: http://dx.doi.org/10.1016/j.ijrefrig.2005.12.009 https://doi.org/10.1016/j.ijrefrig.2005.12.009
  7. B. Na, R. L. Webb, "New model for frost growth rate", Int. Journal of Heat Mass Transfer Vol 47, pp. 925-936, 2004. DOI: http://dx.doi.org/10.1016/j.ijheatmasstransfer.2003.09.001 https://doi.org/10.1016/j.ijheatmasstransfer.2003.09.001
  8. J. Xiao, W. Wang, Y. H. Zhao, F. R. Zhang, "An analysis of the feasibility and characteristics of photoelectric technique applied in defrost control", Int Journal of Refrigerations, Vol. 32, pp. 1350-1357, 2009. DOI: http://dx.doi.org/10.1016/j.ijrefrig.2009.02.014 https://doi.org/10.1016/j.ijrefrig.2009.02.014
  9. W. Wang, J. Xiao, Q. C. Guo, W. P. Lu, Y. C. Feng, "Field test investigation of the characteristics for the air source heat pump under two typical mal-defrost phenomena", Applied Energy, Vol. 88, pp. 4470-4480, 2011. DOI: http://dx.doi.org/10.1016/j.apenergy.2011.05.047 https://doi.org/10.1016/j.apenergy.2011.05.047
  10. C. D. Jeon, D.S. Kim, S. J. Lee, "Feasibility study on a defrost control method by using a photoelectric sensors", Journal of the Korea Academia-Industrial cooperation Society Vol. 15, No. 6 pp. 3389-3395, 2014. DOI: http://dx.doi.org/10.5762/KAIS.2014.15.6.3389 https://doi.org/10.5762/KAIS.2014.15.6.3389
  11. C. D. Jeon, K. S. Jung "Frost sensing device and method", Korean Intellectual Property Office, Patent No. 10-1085691
  12. KS C 9306, Air conditioner, 2002.
  13. KS B 6275, Reciprocating water-chillers, 2002.
  14. K. S. Lee, "Frosting and defrosting characteristics of a fin-tube heat exchanger", Vol. 41, No. 10, pp. 36-43, 2012
  15. J. Xiao, W. Wang, Q. C. Guo, Y. H. Zhao, "An experimental study of the correlation for predicting the frost height in applying the photoelectric technology", Int. Journal of Refrigeration, Vol. 33, pp. 1006-1014, 2010. DOI: http://dx.doi.org/10.1016/j.ijrefrig.2010.03.002 https://doi.org/10.1016/j.ijrefrig.2010.03.002