Excess heat recovery potentials in Swiss industrial systems

Panel: 2. Sustainable production towards a circular economy

Authors:
M. Jibran S. Zuberi, University of Geneva, Switzerland
Martin K. Patel, University of Geneva, Department F.-A. Forel for Environmental and Aquatic Sciences, Group Energy Efficiency, Switzerland

Abstract

The share of energy demand for process heat is typically 70% of the total final energy demand in industry. A significant amount of heat leaves process heating systems through the walls of heat generation and transfer devices and via exhausts and effluents, all termed excess heat. There is a large potential for excess heat recovery in industry worldwide that could be used to substitute part of the process heat demand but there is limited understanding of the size of this potential heat source and on the recovery potential. This study aims to identify excess heat recovery potentials in Swiss industrial process heating systems through exergy and energy analyses. The overall mean energy and exergy efficiencies of the Swiss industrial sector were estimated at 61% and 28% respectively. The gap between the high quality energy input and the comparatively low temperature process heat requirement explains the destruction of exergy. The total amount of excess heat that can potentially be recovered is estimated at 15 PJ p.a. This amount corresponds to 12% and 24%, respectively, of the total final energy and total process heat demand of Swiss industry in 2015. This study also aims to provide an overview of the spatial distribution of the process heat demand by energy carrier and the excess heat recovery potential by temperature level in Swiss industry. These maps highlight different areas of the country with high levels of excess heat and can serve as basis for analyzing potential district heating networks.

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