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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: Exergy performance and optimization potential of refrigeration plants in free cooling operation
Authors: Brenner, Lorenz
Tillenkamp, Frank
Ghiaus, Christian
et. al: No
DOI: 10.1016/
Published in: Energy
Volume(Issue): 209
Issue: 118464
Issue Date: 1-Aug-2020
Publisher / Ed. Institution: Elsevier
ISSN: 0360-5442
Language: English
Subjects: Optimization potential assessment method; Exergy analysis; Refrigeration plants; Free cooling; Optimization potential index; OPI
Subject (DDC): 621.04: Energy engineering
Abstract: Exergy analysis has been widely used to assess refrigeration systems by evaluating exergy losses or exergy efficiency. The latter is mostly used as an indicator to determine the system performance, which requires the comparison of the actual system with its idealized reversible version, but not the practical achievable efficiency. Therefore, a practice-oriented evaluation method for refrigeration plants in free cooling operation is proposed, based on exergy analysis and technical standards as baseline. By considering the exergy input of auxiliary devices, the overall design of hydraulic circuits can be assessed on subsystem level. The achievable optimization potential compared to the state of the art in technology and the performance is revealed with the introduced optimization potential index (OPI). The application is demonstrated on a case study, where the analysis reveals an adequate operation of the field plant in general. Most cooling locations show potential for improvement, which is indicated by an OPI superior to zero. Moreover, the auxiliary electrical exergy input shows the same magnitude as the thermal exergy input, which emphasizes the importance of reducing the electrical energy usage of auxiliary devices in refrigeration plants to increase the performance.
Fulltext version: Published version
License (according to publishing contract): CC BY 4.0: Attribution 4.0 International
Departement: School of Engineering
Organisational Unit: Institute of Energy Systems and Fluid Engineering (IEFE)
Appears in collections:Publikationen School of Engineering

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