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Publications associées (34)

Working Space – An innovative modular timber construction system for the sustainable vertical extension of office buildings

Urban densification issues are one of the key challenges for most European cities. In this context, the vertical extension of existing buildings provides a solution to create usable spaces without wasting additional land. Little attention has been given to ...

2017

Iterative simulation and optimization approach for energy performance evaluation of ground source heat pump systems

Sarah Bourgarel

The energy transition in Switzerland specifies reduction of the country’s primary energy consumption and greenhouse gas emissions. In the building sector, one way to achieve this is through adoption of efficient and sustainable technologies. With this aim, ...

2017

Integration of CO2 networks and Power to Gas for emerging energy autonomous cities in Europe

François Maréchal, Luc Girardin, Raluca-Ancuta Suciu

CO2 is used more and more as a refrigerant in the commercial and food retail industries and a majority of experts believe that its share in the field of residential heating, commercial refrigeration and mobile air conditioning across Europe will be higher ...

2017

Multi-objective optimization of utility systems and heat exchanger networks: method and application to the solar assisted hydrothermal gasification case

François Maréchal, Adriano Viana Ensinas, Alberto Mian, Emanuele Martelli

This work presents a novel framework for the multi-objective synthesis of utility systems and Heat Exchanger Networks (HEN) under single or multi-period operations. In order to solve the resulting Mixed Integer Non Linear (MINLP) programming problem, a bi- ...

Elsevier Science Bv2017

Physical effects of thermal pollution in lakes

Alfred Johny Wüest, Damien Bouffard

Anthropogenic heat emissions into inland waters influence water temperature and affect stratification, heat and nutrient fluxes, deep water renewal, and biota. Given the increased thermal stress on these systems by growing cooling demands of riparian/coast ...

American Geophysical Union2017

Potential of refrigerant based district heating and cooling networks

Samuel Henchoz

Urban areas represent an ever increasing challenge in terms of energy use and environmental impact associated with it. Projections from the United Nation expect this number to reach 66% by 2050. In Europe 40% of the final energy consumption and 36% of the ...

EPFL2016

Key Energy and Technological Aspects of Three Innovative Concepts of District Energy Networks

François Maréchal, Daniel Favrat, Samuel Henchoz, Patrick Chatelan

Energy needs in urban areas are heterogeneous by their nature, spatial distribution and temperature level required. Three concepts of district energy networks that could provide the energy services efficiently to a city centre are compared. The focus is on ...

2016

Towards energy-autonomous cities using CO2 networks and Power to Gas storage

François Maréchal, Paul Michael Stadler, Araz Ashouri, Raluca-Ancuta Suciu

Under Energy Strategy 2050, the federal government of Switzerland plans to greatly reduce per capita energy consumption, decrease the share of fossil fuels, and replace the nuclear electricity generation by gains in efficiency and use of renewable energy s ...

2016

Analysis of a Combined Absorption Cycle for Power and Cooling Production Using a Novel Oil-Free Co-Rotating Scroll Expander

Jürg Alexander Schiffmann, Luis Carlos Mendoza Toledo

This paper presents the integration of a novel scroll expander into a combined power and cooling cyclethat can be driven by low grade heat sources such as solar and waste heat. The scroll device used here is based on a co-rotating technology which allows t ...

2016

Key energy and technological aspects of three innovative concepts of District energy networks

François Maréchal, Daniel Favrat, Samuel Henchoz

In urban areas, the use of thermal energy services is intensive and relatively heterogeneous by their nature, spatial distribution and temperature level required. In this study three concepts of district energy networks that could provide these services ve ...

2015

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