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1

Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany

2

ILK Dresden, Institute of Air Handling and Refrigeration, Bertolt-Brecht-Allee 20, 01309 Dresden, Germany

3

Centre of Applied Research Sustainable Energy Technology – zafh.net, Stuttgart University of Applied Sciences, Schellingstr. 24, 70174 Stuttgart, Germany



These authors contributed equally to this work.





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Author to whom correspondence should be addressed.



Academic Editor: Jean-Michel Nunzi

Abstract On the basis of the Number of Transfer Units NTU method a functional relation between electric power for fans-pumps and effectiveness in dry coolers and wet cooling towers is developed. Based on this relation, a graphical presentation method of monitoring and simulation data of heat rejection units is introduced. The functional relation allows evaluating the thermodynamic performance of differently sized heat rejection units and comparing performance among them. The method is used to evaluate monitoring data of dry coolers of different solar cooling field projects. The novelty of this approach is that performance rating is not limited by a design point or standardized operating conditions of the heat exchanger, but is realizable under flexible conditions. View Full-Text

Keywords: performance evaluation; cooling tower; dry cooler; solar cooling; heat exchanger performance evaluation; cooling tower; dry cooler; solar cooling; heat exchanger





Autor: Hannes Fugmann 1,* , Björn Nienborg 1,†, Gregor Trommler 2,†, Antoine Dalibard 3,† and Lena Schnabel 1

Fuente: http://mdpi.com/



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