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Energies 2015, 8(2), 714-741;

Performance Evaluation of Air-Based Heat Rejection Systems

Fraunhofer ISE, Fraunhofer Institute for Solar Energy Systems, Heidenhofstr. 2, 79110 Freiburg, Germany
ILK Dresden, Institute of Air Handling and Refrigeration, Bertolt-Brecht-Allee 20, 01309 Dresden, Germany
Centre of Applied Research Sustainable Energy Technology –, Stuttgart University of Applied Sciences, Schellingstr. 24, 70174 Stuttgart, Germany
These authors contributed equally to this work.
Author to whom correspondence should be addressed.
Academic Editor: Jean-Michel Nunzi
Received: 2 December 2014 / Accepted: 6 January 2015 / Published: 23 January 2015
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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

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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MDPI and ACS Style

Fugmann, H.; Nienborg, B.; Trommler, G.; Dalibard, A.; Schnabel, L. Performance Evaluation of Air-Based Heat Rejection Systems. Energies 2015, 8, 714-741.

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