Publications de Samuel Henchoz

District heating and cooling energy network using CO2 as a heat and mass transfer fluid

Daniel Favrat, Luc Girardin, François Maréchal, Samuel Henchoz

The 5th generation compact district heating and cooling networks in a temperature range of 10 to 16 °C have a great potential for energy savings by providing a heat source for decentralized heating heat pumps, a cold source for air-conditioning and a heat ...

2018

Novel district heating and cooling energy network using CO2 as a heat and mass transfer fluid

Daniel Favrat, Luc Girardin, François Maréchal, Samuel Henchoz

Compact district energy networks in a temperature range of 10 to 16°C have a great potential for energy savings by providing a heat source for decentralized heating heat pumps, a cold source for air-conditioning and a heat sink for refrigeration or cogener ...

2017

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

Safety issues of a CO2-based System in NEST

Luc Girardin, François Maréchal, Samuel Henchoz

This study addresses the safety issue for the realization of a CO2 heat distribution system in the NEST research and innovation building. It is based on consideration around the concept of CO2 network developed at LENI/IPESE-EPFL and takes advantage from t ...

IPSE-EPFL Valais-Wallis2016

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

Daniel Favrat, François Maréchal, 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

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

Daniel Favrat, François Maréchal, Samuel Henchoz, Patrick Chatelan

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

Dynamic Modeling and Simulation of Two-stage Compression Heat Pumps with Flash Economizer

Daniel Favrat, Samuel Henchoz, Simon Gailledrat, Jean-Baptiste Carré

Multistage heat pumps are one of the most efficient technologies for delivering heat at temperatures below 100°C, Thanks to their fairly high exergy efficiency. In the recent years the development of radial compressors mounted on gas bearings have unlock t ...

2013

Dynamic Modeling and Simulation of Two-phase Evaporators and Condensers in the context of a CO2 Based District Energy Network

Daniel Favrat, François Maréchal, Samuel Henchoz

A new type of district energy network has recently been proposed that is based on the use of CO2 as a heat transfer fluid. It uses the latent heat of vaporization, instead of sensible heat, to store and transfer heat. Previous studies have focused on demon ...

2013

Prototype of a thermally driven heat pump based on integrated Organic Rankine Cycles (ORC)

Daniel Favrat, Jonathan Demierre, Samuel Henchoz

The concept studied in this work is a low power ORC-ORC heat pump system (providing about 20 kW heat at the condenser) and that is composed of an ORC power cycle driving a reversed ORC heat pump cycle, both cycles using the same fluid. The centrifugal comp ...

2012

Performance and Profitability Perspectives of a CO2 based District Energy Network in Geneva’s City Center

Daniel Favrat, Céline Weber, Samuel Henchoz

A new type of district energy network capable of providing simultaneously heating and cooling is being investigated. It is based on the use of CO2 as a heat transfer fluid by taking advantage of the latent heat of vaporization, to store and transfer heat a ...

2012

Prototype of a thermally driven heat pump based on integrated organic Rankine cycles (ORC)

Daniel Favrat, Jonathan Demierre, Samuel Henchoz

The concept studied in this work is a low power ORC-ORC system (about 20 kW heat at the condenser) which is composed of an ORC engine cycle driving a reversed ORC heat pump cycle, both using the same fluid. The radial compressor and turbine are directly co ...

2012

Thermoeconomic Analysis of a Solar Enhanced Energy Storage Concept Based on Thermodynamic Cycles

Samuel Henchoz

Large scale energy storage may play an increasingly important role in the power generation and distribution sector, especially when large shares of renewable energies will have to be integrated into the electrical grid. Up to now pumped-hydro is the only t ...

Pergamon-Elsevier Science Ltd2011

On a Multi-service, CO2 Based, District Energy System for a Better Energy Efficiency of Urban Areas

Samuel Henchoz

District energy systems can potentially decrease the CO2 emissions linked to energy services, thanks to the implementation of polygeneration energy conversion technologies, connected to buildings over a network. To transfer the energy from centralized tech ...

2011