Influence of a Refurbishing on an Old Residential Building’s Wall in Paris in Summer: Mass and Heat Transfer Approach - new
K. Azos-Diaz, B. Tremeac, F. Simon, D. Corgier, C. Marvillet
Laboratoire de Chimie Moléculaire, Génie des Procédés Chimique et Energétique, Paris, France
MANASLU Ing., Savoie Technolac, Le Bourget du Lac, France
The implementation of thermal insulation in old residential building walls could compromise the hygrothermal behavior of the construction, especially in summer time when it is placed inside. A bad installation of insulation could have consequences on the quality of indoor air conditions and on the health of the wall mostly during hot periods. Thus, the evaluation of heat and mass transfer ...
J. M. Dedulle , D. Nguyen 
 SIMTEC, Grenoble, France
 BRGM, Montpellier, France
The Solargeotherm project is assessing the possibility of using vertical geothermal probes drilled into a rock mass (bedrock) for storing the thermal energy produced by solar panels and later releasing it. The research project relies on the installation of an experimental system and the use of heat transfer models. The underground device, set up entirely in Paleozoic schist (greenish grey banded ...
K. O. Lund , S. M. Lord ,
 Kurt Lund Consulting (COMSOL Certified Consultant), Del Mar, CA, USA
 SML Associates, Encinitas, CA, USA
A frequently occurring geometry for heat exchangers is that of a long tube wound into a helix or spiral around a core volume. There is to be heat exchange between the tube and the gases (or solids) in the core. However, the length scales of these two parts of the geometry are very different, thus complicating the interface between the tube and the core processes. Usually, the tube is too ...
WeiDong Fu , DongYou Wang , ZhiJun Qiu 
 Contemporary Amperex Technology Co., Limited, Ningde, China
The thermal behavior of lithium ion batteries could be investigated by efficient simulation method [1,2]. Here, we developed an electrochemical-lumped thermal analytical model to analyze the thermal response and heat breakdown of a pouch LiNi1/3Co1/3Mn1/3O2 battery (3Ah) under fast-discharging conditions at 7C(environment temperature:20℃). The key parameters of the proposed model (such as ...
Numerical Modeling of Resistance Welding Process in Joining of Thermoplastic Composite Materials Using COMSOL Multiphysics®
R. Carbone and A. Langella
Material and Production Engineering Department, Università degli Studi di Napoli Federico II, Napoli, Italy
This paper deals of a technology involved in the joining of thermoplastic composites, the resistance welding technology. This process takes advantage in the repeatable melting process for the thermoplastic resins. The process was numerically modeled to study the effect of the two main process parameters, the electric power density applied to the heating elements and the exposure time at the ...
Modeling and Analysis of a Direct Expansion Geothermal Heat Pump (DX): Part I-Modeling of Ground Heat Exchanger
C. Rousseau, J. Fannou, L. Lamarche, M. Ouzzane
École de Technologie Supérieure, Montréal, Québec, Canada
CanmetENERGY, Varennes, Québec, Canada
Geothermal heat pump technology is actually one of the most interesting processes to provide heat and cold to a building. In this study, a model of the ground exchanger of a direct expansion geothermal heat pump (DX) is going to be presented in 1 dimension. The model represents the phase change of the refrigerant, here Chlorodifluoromethane R22, with governing continuity, momentum and energy ...
E. Firat, G. Bandlamudi, M. Crisogianni, P. Beckhaus, A. Heinzel
Centre for Fuel Cell Technology (ZBT), Duisburg,NRW, Germany
Heat management is crucial for the satisfactory operation of HT-PEM (High temperature polymer-electrolyte-membrane) fuel cells. Current work investigates the use of heat pipes in a HT PEMFC stack consisting of 24 cells, each with an active area of 300 cm^2. Heat pipes are known to be thermal superconductors operating on the principles of high convective heat transfer and phase transition. ...
Y. Wang, D. Uwe Sauer
Electrochemical Energy Conversion and Storage Systems, Institute for Power Electronics and Electrical Drives (ISEA), RWTH Aachen University, Aachen, Germany
HTPEM fuel cells are considered to be the next generation fuel cells. The electrochemical kinetics for electrode reactions are enhanced by using PBI membrane at an operation temperature between 160-180 °C comparing to LTPEM fuel cells. But starting HTPEM fuel cells from room temperature to an operation temperature is a challenge. In this work, using preheated air to heat up the fuel cells ...
F. Eppner , P. Pasquier , P. Baudron ,
 École Polytechnique de Montréal, Montréal, QC, Canada
Standing column wells (SCW) are open-loop geoexchange systems used to provide space heating and cooling to buildings. As they use groundwater as heat carrier fluid and modify its thermo-chemical conditions along the year, they may favor calcite dissolution and precipitation, thus increasing maintenance costs. In order to predict the thermo-hydro-chemical (THC) processes occurring in a SCW and ...
S. Francois, and P. Namy
Nexans Research Center, Lyon cedex, France
SIMTEC, Grenoble, France
Power over Ethernet (PoE/PoE+) is a technology allowing to transmit data and power over the same data cable. The major concern for this technology is the degradation of data transmission performances due to the temperature increase in the cable. To have a better quantitative and qualitative knowledge of the temperature field in the cables, Nexans has developed a 2D finite element thermal model ...