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An experimental study of the correlation for predicting the frost height in applying the photoelectric technology / J. Xiao in International journal of refrigeration, Vol. 33 N° 5 (Août 2010) 

Public ISBD [article]  in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 1006-1014 Titre : An experimental study of the correlation for predicting the frost height in applying the photoelectric technology Titre original : Etude expérimentale sur la corrélation de la prévision de l'accumulation de givre dans l'application de la technologie photoélectrique Type de document : texte imprimé Auteurs : J. Xiao, Auteur ; Wang, W., Auteur ; Q.C. Guo, Auteur Année de publication : 2010 Article en page(s) : pp. 1006-1014 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Refrigeration  system  Heat  exchanger  Finned  tube  Experiment  Measurement  Frost  formation  Sensor-infrared Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : It is found that the photoelectric technology is suitable for the accurate measurement of the frost height. The objectives of this paper are to experimentally investigate the correspondence between the output signal of the photoelectric sensor and the frost height, and then develop a generalized correlation to predict the frost height directly and accurately. The experiments are conducted in a wide range of operating conditions for air temperature 17.7 °C–27.2 °C, relative humidity 21.6% RH to 64.9% RH, air velocity 0.5 m/s to 4.5 m/s and cold surface temperature −10.5 °C to −6.5 °C. Based on 21 groups of experiments with total 600 data, a linear correlation with a relative deviation of ±10% is setup. Further validation of this correlation is conducted by comparing the predicted results with 4 additional experiments, and approximately 95% of the predicted frost heights are consistent with the measured data within a relative deviation of ±10%. These results indicate that the photoelectric technology can predict the frost height directly. The application of the proposed correlation to provide defrost control strategy is also discussed in this paper. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000484 [article] An experimental study of the correlation for predicting the frost height in applying the photoelectric technology = Etude expérimentale sur la corrélation de la prévision de l'accumulation de givre dans l'application de la technologie photoélectrique [texte imprimé] / J. Xiao, Auteur ; Wang, W., Auteur ; Q.C. Guo, Auteur . - 2010 . - pp. 1006-1014. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 33 N° 5 (Août 2010) . - pp. 1006-1014 Mots-clés : Refrigeration  system  Heat  exchanger  Finned  tube  Experiment  Measurement  Frost  formation  Sensor-infrared Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : It is found that the photoelectric technology is suitable for the accurate measurement of the frost height. The objectives of this paper are to experimentally investigate the correspondence between the output signal of the photoelectric sensor and the frost height, and then develop a generalized correlation to predict the frost height directly and accurately. The experiments are conducted in a wide range of operating conditions for air temperature 17.7 °C–27.2 °C, relative humidity 21.6% RH to 64.9% RH, air velocity 0.5 m/s to 4.5 m/s and cold surface temperature −10.5 °C to −6.5 °C. Based on 21 groups of experiments with total 600 data, a linear correlation with a relative deviation of ±10% is setup. Further validation of this correlation is conducted by comparing the predicted results with 4 additional experiments, and approximately 95% of the predicted frost heights are consistent with the measured data within a relative deviation of ±10%. These results indicate that the photoelectric technology can predict the frost height directly. The application of the proposed correlation to provide defrost control strategy is also discussed in this paper. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710000484