Single temperature sensor superheat control using a novel maximum slope-seeking method / K. Vinther in International journal of refrigeration, Vol. 36 N° 3 (Mai 2013)  

Public ISBD [article]  inInternational journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1118–1129 Titre : Single temperature sensor superheat control using a novel maximum slope-seeking method Titre original : Régulation de la surchauffe à l'aide d'un capteur de température unique et une méthode innovante de recherche de la pente maximale de la courbe Type de document : texte imprimé Auteurs : K. Vinther, Auteur ; H. Rasmussen, Auteur ; R. Izadi-Zamanabadi, Auteur Année de publication : 2013 Article en page(s) : pp. 1118–1129 Note générale : Refrigeration Langues : Anglais (eng) Mots-clés : Refrigeration systems  Evaporator  Superheat  Maximum slope-seeking  Harmonics  Control Résumé : Superheating of refrigerant in the evaporator is an important aspect of safe operation of refrigeration systems. The level of superheat is typically controlled by adjusting the flow of refrigerant using an electronic expansion valve, where the superheat is calculated using measurements from a pressure and a temperature sensor. In this paper we show, through extensive testing, that the superheat or filling of the evaporator can actually be controlled using only a single temperature sensor. This can either reduce commissioning costs by lowering the necessary amount of sensors or add fault tolerance in existing systems if a sensor fails (e.g. pressure sensor). The solution is based on a novel maximum slope-seeking control method, where a perturbation signal is added to the valve opening degree, which gives additional information about the system for control purposes. Furthermore, the method does not require a model of the system and can be tuned automatically. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071200326X [article] Single temperature sensor superheat control using a novel maximum slope-seeking method = Régulation de la surchauffe à l'aide d'un capteur de température unique et une méthode innovante de recherche de la pente maximale de la courbe [texte imprimé] / K. Vinther, Auteur ; H. Rasmussen, Auteur ; R. Izadi-Zamanabadi, Auteur . - 2013 . - pp. 1118–1129. Refrigeration Langues : Anglais (eng) in International journal of refrigeration > Vol. 36 N° 3 (Mai 2013) . - pp. 1118–1129 Mots-clés : Refrigeration systems  Evaporator  Superheat  Maximum slope-seeking  Harmonics  Control Résumé : Superheating of refrigerant in the evaporator is an important aspect of safe operation of refrigeration systems. The level of superheat is typically controlled by adjusting the flow of refrigerant using an electronic expansion valve, where the superheat is calculated using measurements from a pressure and a temperature sensor. In this paper we show, through extensive testing, that the superheat or filling of the evaporator can actually be controlled using only a single temperature sensor. This can either reduce commissioning costs by lowering the necessary amount of sensors or add fault tolerance in existing systems if a sensor fails (e.g. pressure sensor). The solution is based on a novel maximum slope-seeking control method, where a perturbation signal is added to the valve opening degree, which gives additional information about the system for control purposes. Furthermore, the method does not require a model of the system and can be tuned automatically. En ligne : http://www.sciencedirect.com/science/article/pii/S014070071200326X

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