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See detailEvaluation of thermal comfort in an office building in the humid tropical climate of Benin
Kiki, Gratien Jesugo Dieudonné ULiege; Kouchade, Clément; Houngan, Aristide Comlan et al

in Building and Environment (2020), 185

Benin, like most West African countries, is confronted with the lack of indoor thermal comfort standards adapted to the realities of the region. This situation leads to the adoption of Western comfort ... [more ▼]

Benin, like most West African countries, is confronted with the lack of indoor thermal comfort standards adapted to the realities of the region. This situation leads to the adoption of Western comfort standards, the consequences of which can be seen in the discomfort of building occupants and above all in significant energy losses. This justifies the need to identify, among the many comfort models developed in the literature, those that are better adapted to the evaluation of thermal comfort in buildings in Benin. Thus, after a literature review on the subject, two comfort models were found to be relevant for the assessment of thermal comfort in air-conditioned buildings in hot and humid regions. These are the adaptive models of L´opez-P´erez and al. and Indraganti and al. The application of these two models on an air-conditioned office building located in the city of Cotonou in southern Benin, resulted in comfort temperatures of 26.1◦Cand 26◦Crespectively. These values, very close to the average neutral temperature of the occupants (26.1◦C), reveal the effectiveness of these adaptive models in assessing thermal comfort in the said building. Moreover, the application of Fanger’s static model (PMV) and hybrid models (aPMV and PMVnew) has shown that the PMVand aPMVof Yao and al. underestimate the adaptability of the occupants to relatively high comfort temperatures while the PMVnewof Olissan and al. overestimates this adaptability. [less ▲]

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See detailAmélioration du confort thermique des bâtiments par utilisation de l’inertie thermique des composites argile-paille de chiendent
Kiki, Gratien Jesugo Dieudonné ULiege; Houngan, Aristide Comlan; Kouchade, Clément et al

in CONGRÈS ANNUEL DE LA SOCIÉTÉ FRANÇAISE DE THERMIQUE (2020, June)

The high energy consumption of buildings is justified by the use of HVAC systems to ensure the thermal comfort of the occupants. A passive measure to improve energy efficiency in this sector is the use of ... [more ▼]

The high energy consumption of buildings is justified by the use of HVAC systems to ensure the thermal comfort of the occupants. A passive measure to improve energy efficiency in this sector is the use of composite material clay-quackgrass in the building envelope. Incorporating 4% quackgrass straw into compressed clay bricks reduces their thermal conductivity by 30% and their effusivity by 11%. Through simulations on a building in a tropical region, the thermal inertia of this composite allows a phase shift of more than 6 ℎ𝑜𝑢𝑟𝑠 of heat flow and an improvement of about 2°𝐶 in the interior temperature. [less ▲]

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See detailInfluence de l'inertie thermique et hydrique des éco-matériaux dans l'amélioration de l'efficacité énergétique des bâtiments
Kiki, Gratien Jesugo Dieudonné ULiege; Hougan, Aristide; Andre, Philippe ULiege et al

Conference (2019, December 03)

Building sector consumes about 40% of the world's energy and emits 40 to 50% of greenhouse gases (GHG). It thus becomes the main actor of the global warming of the planet. According to a study conducted ... [more ▼]

Building sector consumes about 40% of the world's energy and emits 40 to 50% of greenhouse gases (GHG). It thus becomes the main actor of the global warming of the planet. According to a study conducted by the International Energy Agency in 2013, global energy demand in the building sector is expected to increase by 50% by 2050, further accentuating global warming. Several studies showed that the use of eco-materials in the building envelope improves the hygrothermal comfort of the premises and therefore contributes to reducing the energy consumption of buildings. In Benin, almost all the studies carried out in this field are limited to the characterization of these materials. Thus, apart from the hygro-thermo-mechanical characterization of selected eco-materials, our study is also interested in the evaluation of energy gains that can be made. Through simulations under TRNSYS and Wufi software, the envelope of an existing office building is made with selected eco-materials to study the influence of the thermal and hydric inertia of the latter on energy consumption. of the building and the comfort of these occupants. Through this communication, we present results obtained from a thermal comfort survey conducted among occupants and a campaign to monitor the energy consumption of conditioning equipment (air conditioners and fans) in our building study. As selected eco-materials, we have: Compressed Earth Bricks (BTC) whose matrix is cement stabilized clay and reinforced by biosourced materials such as quackgrass, oil palm fibers and chips of wood. Their thermal parameters (thermal conductivity, diffusivity and effusivity) are presented. [less ▲]

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See detailMéthodes de caractérisation thermo-mecanique des éco-matériaux et modèles d’évaluation du confort et de la performance énergétique des bâtiments
Kiki, Gratien Jesugo Dieudonné ULiege; Hougan, Aristide; Andre, Philippe ULiege et al

Conference (2019, September 16)

Heating, ventilation and air-conditioning systems are the main source of the significant energy consumption of buildings. Their use is justified by the need to ensure the hygrothermal comfort of the ... [more ▼]

Heating, ventilation and air-conditioning systems are the main source of the significant energy consumption of buildings. Their use is justified by the need to ensure the hygrothermal comfort of the occupants. However, the use of eco-materials in the building envelope represents a passive means of improving indoor thermal comfort. They therefore contribute to reducing the energy consumption of buildings. Thus, in order to carry out our research work on the influence of the thermal and hydric inertia of eco-materials on the energy efficiency of buildings, a bibliographical study was carried out on eco-materials and the concepts of thermal comfort and energy efficiency in buildings. At the end of this study, the clay - quackgrass straw composite was chosen for the continuation of our work. Methods such as hot tape, gravimetric method and mechanical compression and bending tests were respectively chosen to carry out the thermal (thermal conductivity and thermal effusivity), hydric (sorption isotherms) and mechanical characterizations of the composite. These data will then feed the simulations under TRNSYS and Wufi in order to compare the energy and thermal comfort performances of this composite with those of a building built with conventional materials. The ‘〖PMV〗_new’ and the 'Evidence-based model calibration for energy services' are the methods chosen to assess the thermal comfort level in the test building and its energy consumption profile respectively. [less ▲]

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