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A study on an optimal approach temperature control strategy of condensing water temperature for energy saving / Chia-Wei Liu in International journal of refrigeration, Vol. 34 N° 3 (Mai 2011) 

Public ISBD [article]  in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 816-823 Titre : A study on an optimal approach temperature control strategy of condensing water temperature for energy saving Titre original : Etude sur une approche optimale de la stratégie de régulation de la température de l'eau de condensation permettant d'économiser de l'énergie Type de document : texte imprimé Auteurs : Chia-Wei Liu, Auteur ; Yew-Khoy Chuah, Auteur Année de publication : 2011 Article en page(s) : pp. 816-823 Note générale : Génie Mécanique Langues : Anglais (eng) Mots-clés : Cooling  tower  Energy  saving  Temperature  Wet  bulb Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An optimal approach temperature (OAT) control strategy is proposed for resetting the condensing water temperature hourly, so to maximize the performance of the combined water chiller and cooling tower system. A system performance factor is introduced for evaluation of the system performance. A regression function is presented for the calculation of an optimal condensing water temperature at each hour of air-conditioning operation. The parameters in the regression function include the ambient wet bulb temperature, the chiller load ratio at the hour, and a dimensionless relative efficiency of chiller and cooling tower. The regression function has an R2 close to 1 compared to the computed results. When applied to two cities in Taiwan, the OAT control strategy has a potential to save energy more than 4% on an annual basis. The OAT control strategy is most advantageous when applied to regions with large seasonal variation of wet bulb temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000028 [article] A study on an optimal approach temperature control strategy of condensing water temperature for energy saving = Etude sur une approche optimale de la stratégie de régulation de la température de l'eau de condensation permettant d'économiser de l'énergie [texte imprimé] / Chia-Wei Liu, Auteur ; Yew-Khoy Chuah, Auteur . - 2011 . - pp. 816-823. Génie Mécanique Langues : Anglais (eng) in International journal of refrigeration > Vol. 34 N° 3 (Mai 2011) . - pp. 816-823 Mots-clés : Cooling  tower  Energy  saving  Temperature  Wet  bulb Index. décimale : 621.5 Energie pneumatique. Machinerie et outils. Réfrigération Résumé : An optimal approach temperature (OAT) control strategy is proposed for resetting the condensing water temperature hourly, so to maximize the performance of the combined water chiller and cooling tower system. A system performance factor is introduced for evaluation of the system performance. A regression function is presented for the calculation of an optimal condensing water temperature at each hour of air-conditioning operation. The parameters in the regression function include the ambient wet bulb temperature, the chiller load ratio at the hour, and a dimensionless relative efficiency of chiller and cooling tower. The regression function has an R2 close to 1 compared to the computed results. When applied to two cities in Taiwan, the OAT control strategy has a potential to save energy more than 4% on an annual basis. The OAT control strategy is most advantageous when applied to regions with large seasonal variation of wet bulb temperature. DEWEY : 621.5 ISSN : 0140-7007 En ligne : http://www.sciencedirect.com/science/article/pii/S0140700711000028