An experimental study of an innovative low-energy and low-cost cooling system for buildings is pr... more An experimental study of an innovative low-energy and low-cost cooling system for buildings is presented. To achieve low-energy use, this cooling system simultaneously makes use of three available heat sinks: the ground, evaporation of water and radiation to the sky. This simple, inexpensive and energy-saving system was installed on a single-family 100-m² house in Bordeaux (South-West of France) and tested during summer 2015. On the test sequence presented (10-25 August), this system dissipated an average of 8.5 kWh/day of heat from the building, with a maximum of 19.3 kWh. This energy was dissipated mainly into the ground and crawl space (4.5 kWh/day) and by evaporation and radiative cooling (4.7 kWh/day). The system COP over the period was 19 and it maintained an inside air temperature under 27°C even during warm summer days, with approximately 42 L/day water consumption.
The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be... more The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be evaluated by zonal models. While not as fine-grained as CFD simulation, they do give useful information about temperature and moisture distributions that is not available from lumped-parameter models. Therefore, we have developed a tool, called SimSPARK, to automatically build dynamic zonal simulations of a building zone. Its model library includes different models to describe heat and moisture transfers across the building zone envelope, with two of them taking into account moisture adsorption/desorption by building materials. In this work, we describe in details the SimSPARK architecture and, the current zonal model library. To illustrate the applicability of this tool, we compare two zonal models including adsorption and desorption processes with one that ignores these phenomena, in a ventilated room composed of 27 zones. The results indicate that adsorption/desorption by building ma...
RÉSUMÉ. Le projet FOURMINERGIE s'intéresse à l'amélioration thermique des maisons du quar... more RÉSUMÉ. Le projet FOURMINERGIE s'intéresse à l'amélioration thermique des maisons du quartier de Malartic à Gradignan (proche de Bordeaux) et vise notamment à développer une méthode d'aide à la décision pour le choix de solutions de rénovation. L'approche retenue dans le projet consiste à passer par deux étapes successives. La première étape consiste à aider le propriétaire à choisir les bouquets de travaux répondant au mieux à ses attentes. La seconde étape consiste à spécifier les travaux retenus ; cela consiste par exemple à définir le type d'isolant (laine de verre, laine de mouton, etc.). Ces deux étapes sont basées sur une même méthode décisionnelle : ELECTRE III stochastique. L'évaluation des solutions sur les différents critères est réalisée selon des modèles, des valeurs expertes ou des règles fixés par les experts du projet. L'un des enjeux majeurs de l'outil d'aide à la décision est de servir de support permettant de confronter et faire...
Uncertainty analysis, based on Differential Sensitivity Analysis and Monte Carlo Analysis, has be... more Uncertainty analysis, based on Differential Sensitivity Analysis and Monte Carlo Analysis, has been used in several research projects in order to estimate reliability of results, especially in empirical validation-based projects where both measured and predicted uncertainty bands need to be evaluated. However, such analyses have been time-consuming, involving either repetitive manual changing of the input parameters followed by a simulation run, or involving the writing of speci®c programs to automate the process. Their use has, in consequence, been restricted. This paper reviews the sources of uncertainty in the predictions from thermal simulation programs. It then describes how uncertainty analysis has been incorporated into the thermal simulation program ESP-r. An example of its application is given. #
The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be... more The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be evaluated by zonal models. While not as fine- grained as CFD simulation, they do give useful information about temperature and moisture distributions that is not available from lumped- parameter models. Therefore, we have developed a tool, called SimSPARK, to automatically build dynamic zonal
... National Laboratory rrrrrrr ивааэвшэ ¿ Peer Reviewed Title: Comparing zonal and CFD models of... more ... National Laboratory rrrrrrr ивааэвшэ ¿ Peer Reviewed Title: Comparing zonal and CFD models of air flows in large indoor spaces to experimental data Author: Mora. ... jo ;uara -dopAap aq; pa;Bi;rai [9] z;m^ рив [f] втод aor^oBjd uouiuioq fg s^apoui IBU02 g Suqqmq aji;ua aq; joj ...
The present work is part of a research effort aimed at integrating a detailed model of airflow in... more The present work is part of a research effort aimed at integrating a detailed model of airflow in large spaces with an algebraic multizone infiltration model to describe pollutant transport and coupled air flows within and between complex buildings and large spaces. In the past 15 years, zonal models were developed with the goal to obtain an approximate prediction of
An experimental study of an innovative low-energy and low-cost cooling system for buildings is pr... more An experimental study of an innovative low-energy and low-cost cooling system for buildings is presented. To achieve low-energy use, this cooling system simultaneously makes use of three available heat sinks: the ground, evaporation of water and radiation to the sky. This simple, inexpensive and energy-saving system was installed on a single-family 100-m² house in Bordeaux (South-West of France) and tested during summer 2015. On the test sequence presented (10-25 August), this system dissipated an average of 8.5 kWh/day of heat from the building, with a maximum of 19.3 kWh. This energy was dissipated mainly into the ground and crawl space (4.5 kWh/day) and by evaporation and radiative cooling (4.7 kWh/day). The system COP over the period was 19 and it maintained an inside air temperature under 27°C even during warm summer days, with approximately 42 L/day water consumption.
The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be... more The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be evaluated by zonal models. While not as fine-grained as CFD simulation, they do give useful information about temperature and moisture distributions that is not available from lumped-parameter models. Therefore, we have developed a tool, called SimSPARK, to automatically build dynamic zonal simulations of a building zone. Its model library includes different models to describe heat and moisture transfers across the building zone envelope, with two of them taking into account moisture adsorption/desorption by building materials. In this work, we describe in details the SimSPARK architecture and, the current zonal model library. To illustrate the applicability of this tool, we compare two zonal models including adsorption and desorption processes with one that ignores these phenomena, in a ventilated room composed of 27 zones. The results indicate that adsorption/desorption by building ma...
RÉSUMÉ. Le projet FOURMINERGIE s'intéresse à l'amélioration thermique des maisons du quar... more RÉSUMÉ. Le projet FOURMINERGIE s'intéresse à l'amélioration thermique des maisons du quartier de Malartic à Gradignan (proche de Bordeaux) et vise notamment à développer une méthode d'aide à la décision pour le choix de solutions de rénovation. L'approche retenue dans le projet consiste à passer par deux étapes successives. La première étape consiste à aider le propriétaire à choisir les bouquets de travaux répondant au mieux à ses attentes. La seconde étape consiste à spécifier les travaux retenus ; cela consiste par exemple à définir le type d'isolant (laine de verre, laine de mouton, etc.). Ces deux étapes sont basées sur une même méthode décisionnelle : ELECTRE III stochastique. L'évaluation des solutions sur les différents critères est réalisée selon des modèles, des valeurs expertes ou des règles fixés par les experts du projet. L'un des enjeux majeurs de l'outil d'aide à la décision est de servir de support permettant de confronter et faire...
Uncertainty analysis, based on Differential Sensitivity Analysis and Monte Carlo Analysis, has be... more Uncertainty analysis, based on Differential Sensitivity Analysis and Monte Carlo Analysis, has been used in several research projects in order to estimate reliability of results, especially in empirical validation-based projects where both measured and predicted uncertainty bands need to be evaluated. However, such analyses have been time-consuming, involving either repetitive manual changing of the input parameters followed by a simulation run, or involving the writing of speci®c programs to automate the process. Their use has, in consequence, been restricted. This paper reviews the sources of uncertainty in the predictions from thermal simulation programs. It then describes how uncertainty analysis has been incorporated into the thermal simulation program ESP-r. An example of its application is given. #
The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be... more The non-uniform behavior of the air inside a room, which is important in comfort analysis, can be evaluated by zonal models. While not as fine- grained as CFD simulation, they do give useful information about temperature and moisture distributions that is not available from lumped- parameter models. Therefore, we have developed a tool, called SimSPARK, to automatically build dynamic zonal
... National Laboratory rrrrrrr ивааэвшэ ¿ Peer Reviewed Title: Comparing zonal and CFD models of... more ... National Laboratory rrrrrrr ивааэвшэ ¿ Peer Reviewed Title: Comparing zonal and CFD models of air flows in large indoor spaces to experimental data Author: Mora. ... jo ;uara -dopAap aq; pa;Bi;rai [9] z;m^ рив [f] втод aor^oBjd uouiuioq fg s^apoui IBU02 g Suqqmq aji;ua aq; joj ...
The present work is part of a research effort aimed at integrating a detailed model of airflow in... more The present work is part of a research effort aimed at integrating a detailed model of airflow in large spaces with an algebraic multizone infiltration model to describe pollutant transport and coupled air flows within and between complex buildings and large spaces. In the past 15 years, zonal models were developed with the goal to obtain an approximate prediction of
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