Thermodynamic study of the effects of ambient air conditions on the thermal performance characteristics of a closed wet cooling tower

Papaefthimiou, VD; Rogdakis, ED; Koronaki, IP; Zannis, TC

dc.contributor.author	Papaefthimiou, VD	en
dc.contributor.author	Rogdakis, ED	en
dc.contributor.author	Koronaki, IP	en
dc.contributor.author	Zannis, TC	en
dc.date.accessioned	2014-03-01T01:37:36Z
dc.date.available	2014-03-01T01:37:36Z
dc.date.issued	2012	en
dc.identifier.issn	1359-4311	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/21573
dc.subject	Ambient conditions	en
dc.subject	Closed wet cooling tower	en
dc.subject	Serpentine water	en
dc.subject	Sprayed water	en
dc.subject	Thermal performance	en
dc.subject.classification	Thermodynamics	en
dc.subject.classification	Energy & Fuels	en
dc.subject.classification	Engineering, Mechanical	en
dc.subject.classification	Mechanics	en
dc.subject.other	Ambient air conditions	en
dc.subject.other	Ambient conditions	en
dc.subject.other	Conventional air-conditioning systems	en
dc.subject.other	Degree of saturations	en
dc.subject.other	Dry bulb temperature	en
dc.subject.other	Energy performance	en
dc.subject.other	Experimental data	en
dc.subject.other	High temperature	en
dc.subject.other	Inlet air	en
dc.subject.other	Inlet air condition	en
dc.subject.other	Liquid desiccant	en
dc.subject.other	Liquid solution	en
dc.subject.other	Operational costs	en
dc.subject.other	Sprayed water	en
dc.subject.other	Temperature reduction	en
dc.subject.other	Theoretical investigations	en
dc.subject.other	Thermal behaviours	en
dc.subject.other	Thermal effectiveness	en
dc.subject.other	Thermal Performance	en
dc.subject.other	Thermodynamic model	en
dc.subject.other	Thermodynamic studies	en
dc.subject.other	Water loss	en
dc.subject.other	Water temperatures	en
dc.subject.other	Wet bulb temperature	en
dc.subject.other	Wet cooling tower	en
dc.subject.other	Cooling	en
dc.subject.other	Cooling towers	en
dc.subject.other	Driers (materials)	en
dc.subject.other	Liquids	en
dc.subject.other	Mixed convection	en
dc.subject.other	Serpentine	en
dc.subject.other	Sorption	en
dc.subject.other	Temperature	en
dc.subject.other	Thermal evaporation	en
dc.subject.other	Thermodynamics	en
dc.subject.other	Towers	en
dc.subject.other	Cooling systems	en
dc.title	Thermodynamic study of the effects of ambient air conditions on the thermal performance characteristics of a closed wet cooling tower	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/j.applthermaleng.2011.09.035	en
heal.identifier.secondary	http://dx.doi.org/10.1016/j.applthermaleng.2011.09.035	en
heal.language	English	en
heal.publicationDate	2012	en
heal.abstract	A thermodynamic model was developed and used to assess the sensitivity of thermal performance characteristics of a closed wet cooling tower to inlet air conditions. In the present study, three cases of different ambient conditions are considered: In the first case, the average mid-winter and mid-summer conditions as well as the extreme case of high temperature and relative humidity, in Athens (Greece) during summer are considered according to the Greek Regulation for Buildings Energy Performance. In the second case, the varied inlet air relative humidity while the inlet air dry bulb temperature remains constant were taken into account. In the last case, the effects on cooling tower thermal behaviour when the inlet air wet bulb temperature remains constant were examined. The proposed model is capable of predicting the variation of air thermodynamic properties, sprayed water and serpentine water temperature inside the closed wet cooling tower along its height. The reliability of simulations was tested against experimental data, which were obtained from literature. Thus, the proposed model could be used for the design of industrial and domestic applications of conventional air-conditioning systems as well as for sorption cooling systems with solid and liquid desiccants where closed wet cooling towers are used for precooling the liquid solutions. The most important result of this theoretical investigation is that the highest fall of serpentine water temperature and losses of sprayed water are observed for the lowest value of inlet wet bulb temperature. Hence, the thermal effectiveness, which is associated with the temperature reduction of serpentine water as well as the operational cost, which is related to the sprayed water loss due to evaporation, of a closed wet cooling tower depend predominantly on the degree of saturation of inlet air. (C) 2011 Elsevier Ltd. All rights reserved.	en
heal.publisher	PERGAMON-ELSEVIER SCIENCE LTD	en
heal.journalName	Applied Thermal Engineering	en
dc.identifier.doi	10.1016/j.applthermaleng.2011.09.035	en
dc.identifier.isi	ISI:000297436400023	en
dc.identifier.volume	33-34	en
dc.identifier.issue	1	en
dc.identifier.spage	199	en
dc.identifier.epage	207	en