Publications related to Hydronics

Towards multifunctional building elements: thermal activation of a composite interior GFRP slab

Thomas Keller, Dolaana Khovalyg, Madeline Pugin

Modular multifunctional building elements can overcome major disadvantages of the traditional sequential design and become prospective design solutions for sustainable construction. Thus, this work explores lightweight glass fiber-reinforced polymer (GFRP) ...

IOP Science2021

Street grids for efficient district cooling systems in high-density cities

Shanshan Hsieh, Arno Schlueter

The feasibility of district cooling systems is linked to their efficiency, which is associated with their capital and operational costs. For reasons of ownership and maintenance, the piping network commonly follows the city's street layout. This paper exam ...

ELSEVIER2020

Thermomechanical behavior of underground energy infrastructures

Jacopo Zannin

The employment of geostructures as structural supports and as heat exchangers represent an effective, renewable and sustainable way to satisfy thermal needs of the built environment. The structural support of conventional geotechnical structures is coupled ...

EPFL2020

Endogenous energy efficiency improvements in large-scale retrofits to Swiss residential building stock

Sergey Arzoyan

In standard analyses of Swiss energy and climate policies, the speed and extent of energy efficiency improvements (EEI) are usually assumed to be unaffected, even by policies designed to foster innovation. This project introduces endogenous EEI and barrier ...

IOP Science2019

Self-Heating Effects on the Thermal Noise of Deep Sub-Micron FD-SOI MOSFETs

Yusuf Leblebici

Self-heating effects became more prominent with the introduction of the modern devices like FD-SOI and low thermal conductivity materials such as SiO2. Consequently, the temperature rise of a device due to its self-heating is pronounced more as the gate le ...

2017

Spatial clustering for district heating integration in urban energy systems: application to geothermal energy

François Maréchal, Stéphane Joost, Stefano Moret, Jérémy Michel Pierre Unternährer

Given the challenges related to climate change and dependency from fossil fuels, modification of the energy systems infrastructure to increase the share of renewable energy is a priority in urban energy planning. The high heating density in cities makes it ...

2017

Heating rate effect on particle stimulated nucleation and grains structure during non-isothermal annealing of multi-directionally forged solution treated AA2024

Roland Logé, Saeed Khani Moghanaki

Particle stimulated nucleation (PSN) is one of the importantmechanisms of recrystallizationwhich is investigated in this research during non-isothermal annealing of multi-directionally forged solution treated aluminum alloy 2024. Non-isothermal annealing i ...

Elsevier Science Inc2017

Effect of concurrent precipitation on the texture evolution during continuous heating of multi directionally forged solution treated Al-Cu-Mg alloy

Roland Logé, Saeed Khani Moghanaki

Concurrent precipitation in an age hardenable aluminum alloy determines recrystallization behavior especially grains structure and recrystallization texture during continuous heating. In this study, to investigate the effect of concurrent precipitation on ...

Elsevier Science Inc2017

Experimental evaluation of the thermal performances of a thermosyphon cooling system rejecting heat by natural and forced convection

John Richard Thome, Filippo Cataldo

In the present paper, a closed-loop thermosyphon cooling system for power electronics has been developed and tested. The evaporator is a multi-microchannel heat sink designed for high heat fluxes. The power electronics module is emulated by four independen ...

Pergamon-Elsevier Science Ltd2017

Scanning thermal probe microscope method for the determination of thermal diffusivity of nanocomposite thin films

Jürgen Brugger, Khushboo Agarwal

A commercial scanning thermal microscope has been upgraded to facilitate its use in estimating the radial thermal diffusivity of thin films close to room temperature. The modified setup includes a microcontroller driven microhotplate coupled with a Bluetoo ...

2016

Demand Side Management for Enhanced Integration of Photovoltaics into Grid

Christophe Ballif, Yannick Samuel Riesen, Raffael Fabian Tschui, Christophe Germain Boillat

Demand side management could be a very effective way to shift electric consumption of households to the maximum production hours of photovoltaic (PV) systems. A field study on more than 100 households were performed to evaluate the share of electric consum ...

WIP Wirtschaft und Infrastruktur GmbH & Co Planungs KG2015

The effect of heating rate on the softening behaviour of a deformed Al–Mn alloy with strong and weak concurrent precipitation

Ke Huang

The interaction between recrystallization and concurrent precipitation is strongly dependent on the heating rate during annealing. In this study, the effects of heating rate on the grain structure, recrystallization texture and resulting mechanical propert ...

Elsevier Science Inc2015

Strategic energy planning for large-scale energy systems: A modelling framework to aid decision-making

Daniel Favrat, François Maréchal, Stefano Moret, Victor Codina Gironès

Concerns related to climate change and security of energy supply are pushing various countries to make strategic energy planning decisions. This requires the development of energy models to aid decision- making. Large scale energy models are often very com ...

2015

Plasmonic heating with near infrared resonance nanodot arrays for multiplexing optofluidic applications

Rachel Grange

In this work, we show local laser-induced heating in fluids with gold nanodot arrays prepared by electron-beam lithography that cover resonances in the near infrared spectral range from 750 nm to 880 nm. We utilize two approaches to demonstrate thermal eff ...

Royal Soc Chemistry2014

Critical Heat Flux of R134a and R245fa Inside Small-Diameter Tubes

John Richard Thome, Sylwia Szczukiewicz, Cristiano Bigonha Tibiriça

This article presents new experimental critical heat flux results under saturated flow boiling conditions for a macro/microscale tube. The data were obtained in a horizontal 2.20-mm inside diameter stainless-steel tube with heating lengths of 361 and 154 m ...

Taylor & Francis2013

Borophosphonate Cages: Easily Accessible and Constitutionally Dynamic Heterocubane Scaffolds

Rosario Scopelliti, Kay Severin, Laure Menin, Konstantin Zhurov, Justus Tönnemann

A versatile and experimentally facile procedure for the synthesis of borophosphonate cages of the general formula [tBuPO3BR′]4 is described. The method involves heating of tert-butylphosphonic acid with a boronic acid in toluene to give borophosphonates in ...

Wiley-V C H Verlag Gmbh2012

Fire performance of water-cooled GFRP columns. Part I: Fire endurance investigation

Thomas Keller, Yu Bai, Christian Ludwig

Structural fire endurance experiments were conducted on full-scale cellular glass fiber-reinforced (GFRP) columns under axial compression and subjected to ISO834 fire exposure from one side. Unprotected columns can resist fire for more than 30 min, which i ...

American Society of Civil Engineers2011

Fire performance of water-cooled cellular GFRP columns

Thomas Keller, Yu Bai

Structural fire endurance experiments were conducted on full-scale cellular glass fiber reinforced (GFRP) columns under axial compression and subjected to ISO 834 fire exposure from one side. Unprotected columns could resist fire for more than 30 min, whic ...

Springer-Verlag New York, Ms Ingrid Cunningham, 175 Fifth Ave, New York, Ny 10010 Usa2011

Investigation of End-Wall Film Cooling Configuration Performances in a Linear Cascade

Peter Ott, Magnus Jonsson

An end-wall cooling geometry with both fan-shaped and cylindrical holes is tested. The test case is composed by a linear cascade with cylindrical blades, the cooling holes disposed over eight rows. Each row is disposed along iso-Mach lines to ensure same b ...

2010

Falling Films on Arrays of Horizontal Tubes with R-134a, Part I: Boiling Heat Transfer Results for Four Types of Tubes

John Richard Thome, Jean-François Roques

A new falling film heat transfer test facility has been built for the measurement of local heat transfer coefficients on a vertical array of horizontal tubes, including flow visualization capabilities, for use with refrigerants. Presently, the facility has ...

2007