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Dynamic Exergy Analysis for the Thermal Storage Optimization of the Building Envelope

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  • Valentina Bonetti

    (Energy Systems Research Unit (ESRU), University of Strathclyde, Glasgow G1 1XJ, UK)

  • Georgios Kokogiannakis

    (Sustainable Buildings Research Centre (SBRC), University of Wollongong, Wollongong, NSW 2500, Australia)

Abstract

As a measure of energy “quality”, exergy is meaningful for comparing the potential for thermal storage. Systems containing the same amount of energy could have considerably different capabilities in matching a demand profile, and exergy measures this difference. Exergy stored in the envelope of buildings is central in sustainability because the environment could be an unlimited source of energy if its interaction with the envelope is optimised for maintaining the indoor conditions within comfort ranges. Since the occurring phenomena are highly fluctuating, a dynamic exergy analysis is required; however, dynamic exergy modelling is complex and has not hitherto been implemented in building simulation tools. Simplified energy and exergy assessments are presented for a case study in which thermal storage determines the performance of seven different wall types for utilising nocturnal ventilation as a passive cooling strategy. Hourly temperatures within the walls are obtained with the ESP-r software in free-floating operation and are used to assess the envelope exergy storage capacity. The results for the most suitable wall types were different between the exergy analysis and the more traditional energy performance indicators. The exergy method is an effective technique for selecting the construction type that results in the most favourable free-floating conditions through the analysed passive strategy.

Suggested Citation

  • Valentina Bonetti & Georgios Kokogiannakis, 2017. "Dynamic Exergy Analysis for the Thermal Storage Optimization of the Building Envelope," Energies, MDPI, vol. 10(1), pages 1-19, January.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:1:p:95-:d:87763
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    References listed on IDEAS

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    1. Ma, Peizheng & Wang, Lin-Shu & Guo, Nianhua, 2015. "Energy storage and heat extraction – From thermally activated building systems (TABS) to thermally homeostatic buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 45(C), pages 677-685.
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    Cited by:

    1. Brenner, Lorenz & Tillenkamp, Frank & Krütli, Markus & Ghiaus, Christian, 2020. "Optimization potential index (OPI): An evaluation method for performance assessment and optimization potential of chillers in HVAC plants," Applied Energy, Elsevier, vol. 259(C).
    2. Kotarela, Faidra & Kyritsis, Anastasios & Agathokleous, Rafaela & Papanikolaou, Nick, 2023. "On the exploitation of dynamic simulations for the design of buildings energy systems," Energy, Elsevier, vol. 271(C).
    3. Carlos Fernández Bandera & Ana Fei Muñoz Mardones & Hu Du & Juan Echevarría Trueba & Germán Ramos Ruiz, 2018. "Exergy As a Measure of Sustainable Retrofitting of Buildings," Energies, MDPI, vol. 11(11), pages 1-19, November.
    4. Reini, Mauro & Casisi, Melchiorre, 2020. "The Gouy-Stodola Theorem and the derivation of exergy revised," Energy, Elsevier, vol. 210(C).
    5. George M. Stavrakakis & Dimitris Al. Katsaprakakis & Markos Damasiotis, 2021. "Basic Principles, Most Common Computational Tools, and Capabilities for Building Energy and Urban Microclimate Simulations," Energies, MDPI, vol. 14(20), pages 1-41, October.
    6. Michel Pons, 2019. "Exergy Analysis and Process Optimization with Variable Environment Temperature," Energies, MDPI, vol. 12(24), pages 1-19, December.

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