Exergy analysis of district energy systems and comparison of their exergetic, energetic and environmental performance

Ahmadian, Ehsan and Schmidt, Ralf-Roman (2020) Exergy analysis of district energy systems and comparison of their exergetic, energetic and environmental performance. International Journal of Exergy, 32 (2). ISSN 1742-8297

Full content URL: https://doi.org/10.1504/IJEX.2020.108169

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Exergy analysis of district energy systems and comparison of their exergetic, energetic and environmental performance
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Abstract

This paper investigates the advantages of performing exergy analysis for thermodynamic systems consisting of a district heating network (DHN) by comparing the exergy performance with energetic and environmental performance of three case studies in Austria. Furthermore, the effect of influential parameters such as energy source type, conversion technology, supply/return temperature and reference temperature on exergy performance of the system was investigated. An initial literature review and analysis of the case studies showed that the most influential factor on exergy performance of a system was the type of energy source and its conversion technology. Although lowering the supply temperature of DHN can increase the exergy efficiency of the system, changing reference temperature did not show a clear relationship with exergy efficiency. Finally, no clear relationship between energy and exergy efficiencies of the system was discovered; nevertheless, the higher the exergy efficiency of a system the lower the direct CO2 emissions from it.

Keywords:exergy analysis, thermodynamic systems, exergy indicators, district heating network, energy efficiency, CO2 emissions
Subjects:H Engineering > H300 Mechanical Engineering
H Engineering > H220 Environmental Engineering
H Engineering > H221 Energy Resources
J Technologies > J910 Energy Technologies
H Engineering > H311 Thermodynamics
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ID Code:39278
Deposited On:20 Dec 2019 10:58

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