The thermal performances of a PCM copolymer composite wallboard has been experimentally investiga... more The thermal performances of a PCM copolymer composite wallboard has been experimentally investigated in a full scale test room. The test cell is totally controlled so that a typical day can be repeated (temperature and solar radiative flux). Effects of the PCM are investigated comparing the results obtained with and without composite wallboards for three cases: a summer day, a winter day and a mid-season day. The results show that: (1) for all the cases tested, the decrement factor varies between 0.73 and 0.78 which is quite interesting for use in buildings and particularly for renovation; (2) the air temperature in the room with PCM lowers up to 4.2 • C, the comfort enhancement is more important if the surface temperatures are also considered; (3) the PCM wallboards enhance the natural convection in the room and then there is no thermal stratification contrary to the room without composite; (4) the numerical experiments are fully described and can then be used to evaluate PCM numerical modeling.
A numerical model has been developed in order to accurately simulate the transient thermal behavi... more A numerical model has been developed in order to accurately simulate the transient thermal behavior of a building (a single room). This model has already been described in (Rodler et al., 2013): the energy balance equations consider irradiation, convection, air enthalpy and three‐dimensional heat conduction. The particularity of the program is that it projects the sun patch on the inner walls. The operative and mean radiant temperature are important parameters for the evaluation of comfort indices. Their calculations require the air temperature values and the surfaces temperatures field which vary in the sunspace as a function of position and disposition of the person. We show the importance of the knowledge of the operative temperature distribution and its consequences on the thermal comfort. The refined 3D model is compared to the one obtained by the classical distribution of the solar radiation with a 1D conduction approach and by assuming all incoming radiation touches the floor. The sun patch impact and its three dimension effect are finally discussed for the comfort evaluation of a low inertia cell.
The renovation of a building in terms of thermal insulation will improve the level of energy cons... more The renovation of a building in terms of thermal insulation will improve the level of energy consumption in winter. To improve the summer comfort, we have simulated the introduction of a phase-change material (PCM) in both situations: removed or not removed building. The dynamic building simulation software CoDyBa has been adapted to consider these materials in the calculations. The parametric study is, once the surface material laid down considering the morphology of the premises, about the adjustment of certain characteristics of the material, such as thickness or melting temperature value.
1 Ingénieur FreeLance (JNLOG) -15 place Carnot 69002 Lyon 2 CETHIL-ETB -INSA de Lyon -Bât. Freyss... more 1 Ingénieur FreeLance (JNLOG) -15 place Carnot 69002 Lyon 2 CETHIL-ETB -INSA de Lyon -Bât. Freyssinet -40 av. des Arts 69100 Villeurbanne RESUME. Présentation du logiciel CoDyBa de simulation thermique d'un bâtiment en dynamique, et des développements scientifiques qui s'y rapportent. Perspectives à court et moyen terme. MOTS-CLÉS : simulation, thermique, dynamique.
The presented work addresses the topic of energy savings in existing public buildings, when no si... more The presented work addresses the topic of energy savings in existing public buildings, when no significant retrofits on building envelope or plants can be done and savings can be achieved by designing intelligent ICT-based service to monitor and control environmental conditions, energy loads and plants operation. At the end of 2010 the European Commission, within the Seventh Framework Program, has founded a project entitled ''Smart Energy Efficient Middleware for Public Spaces'' (SEEMPubS). To achieve this goal the project will implement, in a set of demonstrator buildings, an interoperable web-based software and hardware solution for real-time monitoring and control of lighting, heating, ventilation and air conditioning services, through both wired and wireless sensor networks. In this paper the first phase of the project, concerning the selection of the environments to be used as demonstrator and the definition of the control and monitoring strategies to reduce energy consumptions for lighting and air conditioning, are presented.
The thermal performances of a PCM copolymer composite wallboard has been experimentally investiga... more The thermal performances of a PCM copolymer composite wallboard has been experimentally investigated in a full scale test room. The test cell is totally controlled so that a typical day can be repeated (temperature and solar radiative flux). Effects of the PCM are investigated comparing the results obtained with and without composite wallboards for three cases: a summer day, a winter day and a mid-season day. The results show that: (1) for all the cases tested, the decrement factor varies between 0.73 and 0.78 which is quite interesting for use in buildings and particularly for renovation; (2) the air temperature in the room with PCM lowers up to 4.2 • C, the comfort enhancement is more important if the surface temperatures are also considered; (3) the PCM wallboards enhance the natural convection in the room and then there is no thermal stratification contrary to the room without composite; (4) the numerical experiments are fully described and can then be used to evaluate PCM numerical modeling.
A numerical model has been developed in order to accurately simulate the transient thermal behavi... more A numerical model has been developed in order to accurately simulate the transient thermal behavior of a building (a single room). This model has already been described in (Rodler et al., 2013): the energy balance equations consider irradiation, convection, air enthalpy and three‐dimensional heat conduction. The particularity of the program is that it projects the sun patch on the inner walls. The operative and mean radiant temperature are important parameters for the evaluation of comfort indices. Their calculations require the air temperature values and the surfaces temperatures field which vary in the sunspace as a function of position and disposition of the person. We show the importance of the knowledge of the operative temperature distribution and its consequences on the thermal comfort. The refined 3D model is compared to the one obtained by the classical distribution of the solar radiation with a 1D conduction approach and by assuming all incoming radiation touches the floor. The sun patch impact and its three dimension effect are finally discussed for the comfort evaluation of a low inertia cell.
The renovation of a building in terms of thermal insulation will improve the level of energy cons... more The renovation of a building in terms of thermal insulation will improve the level of energy consumption in winter. To improve the summer comfort, we have simulated the introduction of a phase-change material (PCM) in both situations: removed or not removed building. The dynamic building simulation software CoDyBa has been adapted to consider these materials in the calculations. The parametric study is, once the surface material laid down considering the morphology of the premises, about the adjustment of certain characteristics of the material, such as thickness or melting temperature value.
1 Ingénieur FreeLance (JNLOG) -15 place Carnot 69002 Lyon 2 CETHIL-ETB -INSA de Lyon -Bât. Freyss... more 1 Ingénieur FreeLance (JNLOG) -15 place Carnot 69002 Lyon 2 CETHIL-ETB -INSA de Lyon -Bât. Freyssinet -40 av. des Arts 69100 Villeurbanne RESUME. Présentation du logiciel CoDyBa de simulation thermique d'un bâtiment en dynamique, et des développements scientifiques qui s'y rapportent. Perspectives à court et moyen terme. MOTS-CLÉS : simulation, thermique, dynamique.
The presented work addresses the topic of energy savings in existing public buildings, when no si... more The presented work addresses the topic of energy savings in existing public buildings, when no significant retrofits on building envelope or plants can be done and savings can be achieved by designing intelligent ICT-based service to monitor and control environmental conditions, energy loads and plants operation. At the end of 2010 the European Commission, within the Seventh Framework Program, has founded a project entitled ''Smart Energy Efficient Middleware for Public Spaces'' (SEEMPubS). To achieve this goal the project will implement, in a set of demonstrator buildings, an interoperable web-based software and hardware solution for real-time monitoring and control of lighting, heating, ventilation and air conditioning services, through both wired and wireless sensor networks. In this paper the first phase of the project, concerning the selection of the environments to be used as demonstrator and the definition of the control and monitoring strategies to reduce energy consumptions for lighting and air conditioning, are presented.
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