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Exergy As A Decision Tool For The Choice Of Heating And Cooling Emission Systems
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology.
2011 (English)In: Proceedings of the 2nd International Exergy, Life Cycle Assessment, and Sustainability Workshop & Symposium (ELCAS2), 2011Conference paper (Other academic)
Abstract [en]

Buildings have low exergy demand compared to their energy demand. In spite of this,heating and cooling are mostly supplied with high quality energy sources, resulting inhigh thermodynamic losses. Heat pumps give an example how this potential can bebetter exploited, since their energy performance is dependent on the exergy demandof the building. The energy performance of heat pumps is highly dependent onemission temperature in the building and source temperature in the environment.Given certain environmental conditions, the exergy optimization of the emissionsystems has a direct consequence on the performance of the HPs, and hence on theelectricity consumed. In residential buildings, waterborne systems such as floorheating/cooling have large emission surfaces and allow lower input temperatures.However, a certain amount of fresh air has to be supplied for hygienic reasons, whichmight make airborne systems advantageous. In the present paper an exergy analysisof a waterborne and a hollow-core slab emission system is performed to show underwhat conditions each system has the lowest exergy demand. The analysis is based onthe results from SEPE, a specific tool for exergy analysis. It is believed that theresults indicate rational building solutions to the designers

Place, publisher, year, edition, pages
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Building Technologies
URN: urn:nbn:se:kth:diva-65547OAI: diva2:492803
2nd International Exergy, Life Cycle Assessment, and Sustainability Workshop & Symposium (ELCAS2). 19 - 21 June, 2011, NISYROS - GREECE
QC 20120330Available from: 2012-02-08 Created: 2012-01-25 Last updated: 2012-03-30Bibliographically approved

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