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Poor temperature uniformities and high pumping powers due to large pressure drops are the major drawbacks of the conventional microchannel cooling solutions. In this work, a liquid cooling device based on a matrix of microfluidic cells is presented. The coolant flow rate in each microfluidic cell is individually tailored, through thermally activated microvalves, to the local heat extraction needs...
Starting in June 2006, the European Union supports a PhD-network on ‘ Advanced solar heating and cooling for buildings ’ (Solnet). The network consists of nine university research groups from seven different European countries and several commercial enterprises, working in the fields of civil, mechanical, and environmental engineering, as well as architecture. The program is coordinated by Kassel...
This project has been oriented to the development of an energy system unit for powering tramways during shorts periods of time. The aim of this work is to present the results obtained for a high frequency DC-DC converter which is included in the energy unit. The energy unit will consist on two type of energy storage devices: a battery stack and a supercapacitor stack. A comparison of the simulated...
A CFD model is developed in order to complete the experimental study of a new hybrid jet impingement / microchannel cooling scheme by enlarging the spectrum of the parametric study. The most influential parameters of the heat exchange are identified and the capacity of the new design to achieve temperature profiles of the cooled object adapted to the specific needs of a wide range of applications...
In residential environments, a home gateway platform can offer services that are configurable by a user depending on current needs or preferences. Gateway devices are very often managed by a service provider or an access provider to enhance performance or guarantee QoS. Assuming a multi-provider and/or multi-user scenario, a secure framework has to maintain security and privacy between different gateway...
The residential gateway (RGW) is a key infrastructure component in home networks. Nowadays, the Open Service Gateway Initiative (OSGi) seems to be the only platform alternative supporting hot-plug of services and an easy way to deploy new ones which are capable to integrate heterogeneous devices into a common platform. But this platform can be managed by only one manager in a secure way, and this...
A residential gateway can offer services that are configurable by a user depending on current needs or preferences. A set of these preferences can be grouped to form a user profile. One user may own several profiles depending on the environment (home or office) or time (working time or weekend). This article proposes smart cards for storing profiles and maintaining profiles in a secure and portable...
The ePerSpace project intends to demonstrate the achievements of its R&D activities, including both the technical evaluation of the platform and the user acceptance assessment of the services delivered. In order to achieve this goal, two trial phases were planned: the first one, February-April 2005 (trial 1), which consisted of 5 separate sub-trials, and the final trials in the last months of...
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