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Development of a micro thermal sensor for real-time monitoring of lubricating oil concentration / Jonggan Hong in International journal of refrigeration, Vol. 34 N° 1 (Janvier 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 374-382 Titre : Development of a micro thermal sensor for real-time monitoring of lubricating oil concentration Titre original : Développement d'un capteur microthermique pour le suivi en temps réel de la concentration en huile lubrifiante Type de document : texte imprimé Auteurs : Jonggan Hong, Auteur ; Young Soo Chang, Auteur ; Dongsik Kim, Auteur Année de publication : 2011 Article en page(s) : pp. 374-382 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Analysis  Development  Sensor  Measurement-concentration  Concentration  Oil  Refrigerant-concentration Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : We report development of a micro thermal sensor and sensing techniques for monitoring the oil concentration in a refrigeration system. The sensor acquires the thermal response of the mixture to ac heating and then the concentration can be determined using one of the two different methods. In the first method, the thermal conductivity of the mixture is obtained using the three-omega method and the concentration is determined using the correlation between the mixture concentration and thermal conductivity. In the alternative fast-detection method, the concentration is determined by directly calibrating the sensor output signal to the mixture concentration. The performance of the sensor was tested using the R410A/polyvinyl ether (PVE) oil mixture. The uncertainty of the oil concentration measurement was estimated to be 5.8–7.3 wt.%, depending on the sensing scheme. Especially, the simple structure of the sensor makes the technique cost effective and adequate for miniaturization, i.e., for installation in a limited space. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001556 [article] Development of a micro thermal sensor for real-time monitoring of lubricating oil concentration = Développement d'un capteur microthermique pour le suivi en temps réel de la concentration en huile lubrifiante [texte imprimé] / Jonggan Hong, Auteur ; Young Soo Chang, Auteur ; Dongsik Kim, Auteur . - 2011 . - pp. 374-382. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 1 (Janvier 2011) . - pp. 374-382 Mots-clés : Analysis  Development  Sensor  Measurement-concentration  Concentration  Oil  Refrigerant-concentration Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : We report development of a micro thermal sensor and sensing techniques for monitoring the oil concentration in a refrigeration system. The sensor acquires the thermal response of the mixture to ac heating and then the concentration can be determined using one of the two different methods. In the first method, the thermal conductivity of the mixture is obtained using the three-omega method and the concentration is determined using the correlation between the mixture concentration and thermal conductivity. In the alternative fast-detection method, the concentration is determined by directly calibrating the sensor output signal to the mixture concentration. The performance of the sensor was tested using the R410A/polyvinyl ether (PVE) oil mixture. The uncertainty of the oil concentration measurement was estimated to be 5.8–7.3 wt.%, depending on the sensing scheme. Especially, the simple structure of the sensor makes the technique cost effective and adequate for miniaturization, i.e., for installation in a limited space. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700710001556