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Net-Zero Energy or Net-Zero Exergy Buildings for a Sustainable Built Environment?
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
2010 (English)In: Proceedings of the 10th REHVA World Congress CLIMA 2010, Antalya, 2010Conference paper, Published paper (Refereed)
Abstract [en]

This paper puts forth a new metric that identifies a net-zero exergy building (ZEXB) target and distinguishes the parameters that affect the results of obtaining a “net-zero” status based on the trade of exergy with the grid and/or thermal energy loop. Key strategies that guide buildings to meet and exceed ZEXB targets are underlined. These include strategies based on the re-linkage of energy resources based on higher exergy matches while reducing any CO2 emission impacts. The means of bringing buildings that deploy on-site, micro production of electricity, heat, and/or cold from renewable energy resources to ZEXB targets are discussed. A net-zero exergy community (ZEXC) target is then provided to set pace for the diversified trade of exergy in the locally more interconnected energy systems of the future. The results expand net-zero targets with exergy based strategies for a sustainable built environment.

Place, publisher, year, edition, pages
Antalya, 2010.
National Category
Building Technologies
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-42467ISBN: 978-975-6907-14-6 (print)OAI: oai:DiVA.org:kth-42467DiVA: diva2:447132
Conference
10th REHVA World Congress CLIMA 2010
Funder
StandUp
Note
QC 20111014Available from: 2011-10-10 Created: 2011-10-10 Last updated: 2011-10-14Bibliographically approved
In thesis
1. A Rational Exergy Management Model to Curb CO2 Emissions in the Exergy-Aware Built Environments of the Future
Open this publication in new window or tab >>A Rational Exergy Management Model to Curb CO2 Emissions in the Exergy-Aware Built Environments of the Future
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis puts forth the means of a strategic approach to address a persistent problem in the energy system and in this way, to transition the built environment to a future state that is more exergy-aware to curb CO2 emissions. Such a vision is made possible by the six-fold contributions of the research work: I) An analytical model is developed, which for the first time, formulates the CO2 emissions that are compounded in the energy system as a function of the systematic failures to match the supply and demand of exergy. This model is namely the Rational Exergy Management Model or REMM. II) REMM is then applied to analyze the pathways in which it is possible to lead the built environment into addressing structural overshoots in its exergy supply to curb CO2 emissions. The cases that embody these pathways are also analyzed over a base case, including cases for sustainable heating and cooling. III) New tools are designed to augment decision-making and exemplify a paradigm shift in the more rational usage of exergy to curb CO2 emissions. These include a scenario-based analysis tool, new options for CO2 wedges, and a multi-fold solution space for CO2 mitigation strategies based on REMM. IV) The concept of a net-zero exergy building (NZEXB) is developed and related to REMM strategies as the building block of an exergy-aware energy system. The target of a NZEXB is further supported by key design principles, which address shortcomings in state-of-the-art net-zero design. V) A premier building that deployed the key design principles to integrate building technology in an innovative, exergy-aware design and received LEED Platinum is analyzed on the basis of the NZEXB target. The results validate that this building boosts net self-sufficiency and curbs compound CO2 emissions, which are then presented in a proposed scheme to benchmark and/or label future NZEXBs. VI) Based on the scalability of the best-practices of the NZEXB ready building, the means to realize a smarter energy system that has exergy-aware relations in each aspect of the value chain to curb CO2 emissions are discussed. This includes a target for such a network at the community level, namely a net-zero exergy community (NZEXC). As a whole, the results of the thesis indicate that the strategic approach as provided by REMM and the NZEXB target of the research work has the potential to steer the speed and direction of societal action to curb CO2 emissions. The thesis concludes with a roadmap that represents a cyclical series of actions that may be scaled-up at various levels of the built environment in a transition to be in better balance with the Planet.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. x, 74 p.
Series
Meddelande. Institutionen för byggvetenskap, ISSN 1651-5563 ; 204
Keyword
Exergy, CO2 emissions, built environment, buildings, energy system, scenario-based analysis, mitigation strategies, net-zero, LEED, energy transition, transition management
National Category
Building Technologies
Research subject
SRA - Energy
Identifiers
urn:nbn:se:kth:diva-42469 (URN)978-91-7501-129-5 (ISBN)
Public defence
2011-11-09, sal F3, Lindstedtsvägen 26, KTH, Stockholm, 15:00 (English)
Opponent
Supervisors
Funder
StandUp
Note
QC 20111014Available from: 2011-10-14 Created: 2011-10-10 Last updated: 2011-10-14Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
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  • modern-language-association-8th-edition
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