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Rational Exergy Management Model for Sustainable Buildings to Reduce CO2 Emissions
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
2009 (English)In: Proceedings of the 40th Congress on HVAC&R, Belgrade: KGH , 2009, , 22 p.391-412 p.Conference paper, Published paper (Refereed)
Abstract [en]

Aiming to respond to ever-urgent needs for strategies to curb buildings’ CO2 emissions at large, a new model, namely the Rational Exergy Management Model (REMM), was developed. REMM provides a new analytical perspective on the energy usage and emissions of buildings with an intra-systems scope. It links the initial mismatch in the supply and demand of exergy to broader impacts in the energy system. Particularly, based on a cross-cutting parameter, it formulates the compound CO2 emissions factor, which includes a direct and avoidable CO2 emissions footprint according to the level of exergy mismatch. Presently, base-case buildings have sub-optimal values due to structural exergy overshoots. This paper thus exemplifies an array of strategies developed for exergy-green paradigm shifts. These include supply, demand-driven, and hybrid approaches, and net-zero exergy building targets, which integrate into multi-fold CO2 mitigation strategies for buildings. A new, exergy-mapping technique furthers the demand-driven approach for bundles of renewable energy. Furthermore, an analysis tool based on exergy-centric scenarios formulates the CO2 savings relative to the base-case to expand the horizon of existing CO2 wedges. The paper concludes that REMM identifies key opportunities for sustainable buildings to capture their vast CO2 reduction potential and increase their lead in CO2 mitigation.

Place, publisher, year, edition, pages
Belgrade: KGH , 2009. , 22 p.391-412 p.
Keyword [en]
energy, sustainable buildings, exergy, CO2 emissions, net-zero buildings, carbon mitigation
National Category
Building Technologies
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-42461ISBN: 978-86-81505-50-2 (print)OAI: oai:DiVA.org:kth-42461DiVA: diva2:447126
Conference
The 40th Congress on HVAC&R, Belgrade 2009
Funder
StandUp
Note

QC 20111014

Available from: 2011-10-10 Created: 2011-10-10 Last updated: 2014-05-23Bibliographically 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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Output format
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