International Sustainable Energy Conference

About the Conference Proceedings Series

The ISEC - Proceedings cover the proceedings of the international ISEC conference taking place every second year.

Current Conference Proceedings Volume

Vol. 2 (2026): ISEC 2026 – 4th International Sustainable Energy Conference

Editors

Christian Fink, Conference Chair of ISEC and CEO of AEE – Institute for Sustainable Technologies, Austria

Christoph Brunner, Conference Chair of ISEC and CEO of AEE – Institute for Sustainable Technologies, Austria

Review Process

The papers are accepted for the conference on the basis of their abstract. The full papers do not undergo further review.

Published: 2026-04-17

Conference Dates: April 14 - April 16 2026

Conference Location: Messecongress Graz, Austria

Implementations and Novel Concepts in District Heating & Cooling

Smart Control of Small District Heating: Towards an Actual Implementation

François Lédée, Zinédine Taïeb, Adrien Wulveryck, Nicolas Vasset, Florent Lefrançois, Nicolas Lamaison
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Hydrogen-Fuelled Combined Heat and Power for District Heating

Andreas Patha, Felix Hubmann, Bernhard Thaler, Clement Leroux
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Industrial Circular Economy Solution

Evaluating Circularity in Life Cycle Assessment based on the Case Study Re-Use Ziegelwand

Semjon Popek, Sonja Siegl, Severin Kysela, Hans Hafellner, Alexander Passer
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Innovations in the Use of Renewables and Waste Heat

Waste Heat Utilisation in Automotive Factories From On-Site Heat Coverage to District Heating Contribution

Manuel Berendes, Patrick Dehning, Alexander Schlüter
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Energy From Wastewater as a Renewable Energy Source for Heating and Cooling in Municipalities and Industry. Successful Implementations, Further Potential and Future Outlook

Flora Prenner, Julian Koller, Rainer Wiedemann
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Direct Generation of Compressed Air from Low-Temperature Waste Heat

Torsten Seidel, Olaf Andersen, Michael Lehmann, Cris Kostmann
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Power-to-Methane: Heat Integration and Techno-Economic Analysis

Abdelkrim Benmehel, El Hassan Sebbar, Tarik Kousksou
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Analysis of Marine and Industrial Condensing Steam Engine Performance for Low-Grade Waste Heat Recovery A Practical Solution in an Era of Super Technologies

Matthew Janssen
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Techno-Economic Viability of a Solar Thermal Steam Kitchen for Rural Schools of the Global South

Matthew Janssen, Craig Wikoff
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Industrial Electrification Potential for Decarbonization in Quebec

Soseh Zadoorian, Omar Mostafa, Etienne Bernier, Abdelaziz Hammache
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Policies for Phase-Out Fossil Fuels and Carbon Management

Is Efficient Efficient? Or: How to Define Efficient District Heating in a Renewable World?

Benjamin Köhler, Lena Vorspel, Max Fette, Stefanie Frost, Pia Borgert, Peter Bodden, Christopher Seifried, Bernd Tenberg
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Novel Approaches in Data Usage, Digitisation, Modelling and System Assessment

Occupant Counting and Position Detection via Machine Learning on Multimodal Image Data

Sascha Hammes, Benjamin Haberl, Johannes Weninger, Philipp Zech
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Reference Models for Comparing Simulation Tools to Evaluate Low-Carbon High-Comfort Integrated Lighting

David Geisler-Moroder, Xuran Guo, Sascha Hammes, Christian Knoflach, Martin Hauer, Daniel Rüdisser, Zhen Tian
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The Role of Organizational Learning and Knowledge Management for Successful BIM Integration in Lighting Design

Sascha Hammes, Johannes Weninger, David Geisler-Moroder, Johannes Strohm, Mathias Wambsganß
Improving Supervision of Cooling Towers With Complementary Machine Learning

Lennart Heinen, Nicolas Réhault
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Operational Optimization of PV-Assisted Heat Pump Systems Using Reinforcement Learning

Andreas Heinz, Birgit Hofer, Franz Wotawa
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Estimating Real-Time Occupancy in Multi-Zone Offices A Comparison Between Conventional Techniques and Deep Learning Methods

Pablo Hernandez-Cruz, Moisés Cordeiro-Costas, Raquel Pérez-Orozco, Zaloa Azkorra-Larrinaga, Pablo Eguía-Oller, Aitor Erkoreka-Gonzalez
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Design and Implementation of a Smart Solar Thermal Monitoring and Predictive Control System With Autonomous Fault Mitigation

Gorata Matsapa, Oboetswe S. Motsamai, Kevin N. Nwaigwe
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Optimization of CO₂ Emission Taxation in Switzerland Using Machine Learning

Huy-Duc Nguyen, David Wannier, Dominique Genoud
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Sustainable Fuels and Chemicals

From Biogas to Grid: Co-Electrolysis and Methanation for High-Yield Biomethane

Stefan Beringer, Julian Gruber, Stefan Sturm, Klara Treusch, Marie-Gabrielle Macherhammer, Vanja Subotić, Alexander Trattner
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Transformation in Buildings, Districts and Cities

Towards Positive Energy Districts Heat Pump System Topology Design Guidelines

Fabian Ochs, Elisa Venturi, Samuel Breuss, Franziska Bockelmann, Carsten Wemhoener
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An Approach for a Discursive Transformation of Energy Systems Using Aggregated Building Models

Stefanie Lott, Dr. Harald Drück, Prof. Dr.-Ing. Konstantinos Stergiaropoulos
Energy Consumption in Lodges and Guesthouses in Lesotho: Insights from Audits and Solar Water Heating

Reabetsoe Sehobai, Moruti Kao, Palesa Nkaile, Sebota Mokeke, Leboli Zak Thamae
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Thermal Active Surfaces as Drivers of Passive Cooling Strategies A Study of Public Office Buildings in Mexico City

Ivett Flores Núñez
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The Five-Stage Transformation of the Austrian Housing Stock towards Net Zero and beyond

Gerlinde Gutheil-Knopp-Kirchwald
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Impact of Hygrothermal Properties of Materials on the Energy Efficiency of Ventilation Units

Laurin Blum, David Sengl, Benedikt Göhmann, Maximilian Gruber
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Optimizing Energy in Single-Family Homes From Biomass Boilers to Heat Pumps

Astrid Leitner, Bernd Riederer, Andreas Moser, Daniel Muschick, Valentin Kaisermayer, Jakob Fuchsberger, Christopher Zemann, Markus Gölles
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From Heat Demand to Engagement: Mapping Socio-Technical Conditions for Urban Energy Planning An Exploratory, Multi-Scale Statistical Assessment of Heating System Age and Heat Demand Across Socio-Cultural Milieus

Timmy Schwarz
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Non-Technical Enablers Driving the Energy Transition

FLEXcheck A Guideline for Estimating Industrial Flexibility Potential

Bernd Riederer, Kerstin Pfleger-Schopf, Julia Schönfelder, Sebastian Dietze, Cyrus Alexander Emami, Martin Puster, Sandra Staudt, Valentin Kaisermayer, Daniel Muschick, Thomas Kienberger, Markus Gölles
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Energy Booster A Qualification and Information Offensive for Innovative Building Technology and Renewable Energies

Bram Entrop
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Regulation’s Role Shaping Prefabrication for Energy Retrofit

Laura Orfali Soria, Chiara Piccardo, Jan Wurm, Carlos Ernesto Ochoa Morales
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Promising Heat & Cold Storage Technologies

Innovative Thermal Storage for High Temperature Industry Decarbonisation - HEATERNAL EU Project

Sylvie Douard, Laura Teodorescu, Franck Pra, Julie Van Zele, Wim Beyne, Michel De Paepe, Jera Van Nieuwenhuyse, Grégory Largiller
Exploration of Kgalagadi Sand as a High-Temperature Heat Storage Material for the Growing Renewable Energy Market in Botswana

Kago Rabasoma, Kevin N. Nwaigwe, Edward Dintwa
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Spatial Energy Planning

Impact of Building Design Variables on Demand Response Capability Considering Local Grid Profiles

Simon Hinterseer, Maximilian Neusser, Andreas Sarkany, Florian Schnabel, Sabine Sint, Thomas Bednar
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Symbiosis Through Coupling Energy Sectors and Customer Groups

PVT Readiness of Heat Pumps – Definition and Market Overview

Bärbel Epp, Harald Drück, Korbinian S. Kramer, Federico Giovannetti, Peter Pärisch
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Technologies and Measures for the Rapid Renovation of the Building Stock

Effects of Heat Saving Measures on Thermal Comfort in an Office Building in Germany Evaluating Measurement Data From an Office Building in Operation

Raffaela Goldschmidt, Matthias Leger, Jens Ullmann, Peter Lierhammer, Pascal Häbig, Harald Drück, Ludger Eltrop, Kai Hufendiek, Konstantinos Stergiaropoulos
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Energy and Greenhouse Gas Emission Savings Through Serial Renovations by Applying the RENVELOPE System in Austria

Alexis Mundt, Wolfgang Amann, Florine Leighton
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A Pareto-Based Multi-Criteria Framework for Evaluating Refurbishment Packages for Energy Flexibility

David Sengl, Edit Paráda
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From Technical Innovation to Market Uptake Pop-Up Factories and Integrated ESCO–Crowdfunding Frameworks for Scalable Deep Renovation

María Ibáñez-Puy , Sara Dorregaray-Oyaregui , Dagmar Jähnig, Niccolò Sovico , Julia Semeniuk, Bianca Andaloro , Markus Meissner, Marco Cucuzza , Chiara Stanghini , Eren Cavusoglu
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