Habib Ben Bacha - Academia.edu (original) (raw)

Papers by Habib Ben Bacha

The membrane distillation is a process vacuum evaporative using porous membranes such as physical... more The membrane distillation is a process vacuum evaporative using porous membranes such as physical barriers between a liquid and a permeate gas. The vaporization takes place in the liquid / membrane under vacuum. In this process the heat transfer and mass are coupled. The objective here is to determine the operating conditions for a transfer of material importance and low energy consumption in a hollow fiber module applied to water desalination and study modeling the operation mode of the different compartments of the desalination process seawater by the membrane under vacuum and coupling solar energy to describe the behavior of the membrane under vacuum with a numerical simulation to determine the outlet temperature.

This paper present a design of an electricity production system from a mechanical power generatio... more This paper present a design of an electricity production system from a mechanical power generation based on solar heated Rankine cycle operating at low temperature range, developed at the Laboratory of Electromechanical Systems of the National Engineering School of Sfax – Tunisia. The proposed system permits to produce electricity from solar thermal energy and auxiliary heater upon a demand. The dynamic modelling of heat and mass transfer behaviours of the different sections (solar collector, storage tank, evaporator etc.) are presented. The mathematical balance equations are numerically resolved using the finite volume method. The numerical simulation permit to study the behaviour of the system and it would enhance the performance of such installation.

Journal of Energy Storage, 2021

Coatings, 2021

The flow of nanofluids is very important in industrial refrigeration systems. The operation of nu... more The flow of nanofluids is very important in industrial refrigeration systems. The operation of nuclear reactors and the cooling of the entire installation to improve safety and economics are entirely dependent on the application of nanofluids in water. Therefore, a model of Maxwell’s dusty nanofluid with temperature-dependent viscosity, surface suction and variable surface tension under the action of solar radiation is established. The basic equations of momentum and temperature of the dust and liquid phases are solved numerically using the MATLAB bvp4c scheme. In the current evaluation, taking into account variable surface tension and varying viscosity, the effect of dust particles is studied by immersing dust particles in a nanofluid. Qualitative and quantitative discussions are provided to focus on the effect of physical parameters on mass and heat transfer. The propagation results show that this mixing effect can significantly increase the thermal conductivity of nanofluids. Wit...

International Communications in Heat and Mass Transfer, 2021

Journal of Energy Storage, 2020

The potable water shortage is a big problem facing the governments and decision-makers everywhere... more The potable water shortage is a big problem facing the governments and decision-makers everywhere. Solar distiller is one of the techniques that participate in solving this problem. In this work, the impact of internal reflectors on the trays distiller performance was investigated. Besides, the influence of painting the surfaces of the solar still by the mixture of black paint and copper oxide (CuO) nanoparticles was studied. This is to enhance the heat transfer characteristics between the basin surfaces and water. Finally, the impact of using the paraffin wax mixed with CuO nanoparticles as a phase change material (PCM) on the performance of trays distiller was evaluated. Experimental results revealed that the total freshwater yield of the trays distiller was improved by 57, 14, 70.7, and 108% when using reflectors, CuO nanoparticles in paint, reflectors and nano-coating, and the collection of reflectors, nano coating, and PCM with CuO nanoparticles respectively over that of the reference still. Also, the total accumulated freshwater of the conventional and trays solar stills reached 2400 and 5000 mL/ m² a day, respectively. Moreover, the thermal efficiency of the trays distiller with reflectors, nano-paint coating, and PCM-CuO nanoparticles mixture was 51.5%.

International Journal of Ventilation, 2019

This paper proposes an original and sustainable design for a Hybrid solar Air Conditioning-Ventil... more This paper proposes an original and sustainable design for a Hybrid solar Air Conditioning-Ventilation-Humidification-Dehumidification (HDH) desalination system. The proposed design permits to produce both thermal comfort and desalinated water for residential buildings. The originality of the system design as well as its operating principle is described in detail. Mathematical models, that govern the heat and mass transfer in the different compartments of the proposed design and within the conditioned space, are elaborated. A numerical investigation is carried out to assess the heat and mass transfer performance of the designed hybrid system, as well as the produced thermal comfort within the conditioned space. All numerical simulations are carried out under the realistic climatic conditions of the region of Gafsa-Tunisia (34.4311 N, 8.7757 E). Results show that the performance of the proposed design and its ability to produce thermal comfort, in the conditioned space, are within the air conditioning standards. Buildings in hot and arid regions can fully benefit from such a sustainable design.

Heat and Mass Transfer, 2018

This work deals with the dimensioning of multi-packed-bed dehumidifiers used in solar airconditio... more This work deals with the dimensioning of multi-packed-bed dehumidifiers used in solar airconditioning systems. An efficient dimensioning methodology is elaborated, explained and visualized by a chart. The proposed methodology permits to ensure an appropriate packed-bed dimensioning based on a compromise between the highest possible amount of heat and mass transfer and the lowest possible level of pressure drop within a packed-bed-dehumidifier. Nomography tool is implemented in order to simplify, speed up and expand the possibilities of dimensioning. The proposed nomographs permit to determine the appropriate values of the diameter, the porosity and the height of the packed-bed. The mathematical construction techniques of all nomographs are presented in detail. Applied examples are carried out in order to show the effectiveness of each nomograph. NomenclatureSymbols C pa Air specific heat, (J.kg −1 .K −1) C ps Deicccant specific heat, (J.kg −1 .K −1) C pv Water vapor specific heat, (J.kg −1 .K −1) C pw Water specific heat, (J.kg −1 .K −1) D Bed diameter, (m) D 0 Water vapor diffusivity, (m 2 .s −1) D e Effective diffusivity, (m 2 .s −1) d p Desiccant particle diameter, (m) E 0 Activation energy, (J.mol −1) H Bed height, (m) N Number of beds constituting the dehumidifier system, (.) q Desiccant moisture content (kg[H 2 O].kg −1 [dry desiccant]) q ∞ Equilibrium desiccant moisture content (kg[H 2 O].kg −1 [dry desiccant]) R Perfect gas constant, (J.mol −1 .K −1) T inlet Inlet air temperature, (°C) V Air velocity, (m/s) VR Ventilation rate, (m 3 /s) Greek symbols ΔH ads Latent heat of evaporation (J.kg −1) ΔP a Maximum allowable pressure drop, (Pa) ε Bed porosity, (.) λ a Air thermal conductivity, (W.m −1 .K −1) λ s Desiccant thermal conductivity, (W.m −1 .K −1) μ a Air dynamic viscosity, (Pa.s) ρ a Air density, (kg.m −3) ρ s Desiccant density, (kg.m −3) Ø Air relative humidity, (%) ω Air humidity ratio, (kg[water vapor].kg −1 [dry air]) δ 1 , δ 3 , μ 1 , μ 3 Functional Moduli (scale factors)

Desalination, 2017

This work presents a modified solar still with pin fins absorber and external condenser. An exper... more This work presents a modified solar still with pin fins absorber and external condenser. An experimental comparative study is carried out between the modified solar still with pin fins absorber and condenser, still with pin fins absorber and conventional still. This experimental study is conducted to evaluate the thermal behavior (evolutions of absorber and glass temperatures) and the water production performance of the modified solar still with pin fins absorber and condenser compared to other designs. All experiments are carried out under the meteorological conditions of the region of Gafsa-Tunisia during the days 01/26/2016, 01/27/2016 and 01/29/ 2016. Experimental results are presented, quantified and discussed to show the utility of the proposed modified solar still.

Journal of Mechanical Science and Technology, 2016

This paper tackles an optimization approach in order to boost the fresh water production of a new... more This paper tackles an optimization approach in order to boost the fresh water production of a new design of a solar still which is located at Sfax engineering national school in Tunisia. This optimization approach is based upon the above mentioned design's improvement by coupling the conventional solar still into at a condenser, solar air and water collector and humidifier. This new concept of a distiller solar still using humidification-dehumidification processes (HD) is exploited for the desalination purpose. As a result of this work, the humidification-dehumidification processes have an essential effect in improving the solar still performance. Performance has been predicted theoretically in terms of water and inner glass cover temperatures, the inlet temperature of air and water of the new concept of distiller on water condensation rate and fresh water production. A general model based on heat and mass transfers in each component of the unit has been developed in steady dynamic regime. The developed model is used, simulating the HD system, to investigate the influence of the meteorological and operating parameters on the system productivity. The obtained set of ordinary differential equations has been converted to a set of algebraic system of equations by the functional approximation method of orthogonal collocation. The developed model is used to simulate the HD system in order to investigate the steady state behavior of each component of the unit and the entire system exposed to a variation of the entrance parameters and meteorological conditions. The obtained results were compared with those of other studies and the comparison gives a good validity of the present results.

RELIABILITY: THEORY & …, 2007

M. Elleuch, B. Ben, F. Masmoudi Improvement of manufacturing cells with unreliable machines-RTA# ... more M. Elleuch, B. Ben, F. Masmoudi Improvement of manufacturing cells with unreliable machines-RTA# 3-4, 2007, December-Special Issue -54-1. Introduction Group technology (GT) is a manufacturing philosophy that has attracted a lot of attention because of its ...

The International Journal of Advanced Manufacturing Technology, 2016

Résumé. Ce papier présente les différentes étapes réalisées pour la conception et le développemen... more Résumé. Ce papier présente les différentes étapes réalisées pour la conception et le développement d'un système expert pour la maintenance des machines. Le système développé est un outil spécifique dédié au diagnostic des pannes et des dysfonctionnements. La modélisation de la base de connaissance est réalisée en utilisant la méthode AMDEC. Cet outil s'est trouvé bien adapté à l'exploitation de l'intelligence artificielle dans le domaine de la maintenance. La validation du bon fonctionnement du logiciel a été assurée à l'aide d'un exemple pratique d'une machine de surfaçage des verres optiques. Abstract.The different steps to construct the expert systems for maintenance are presented in this paper. The developed system is a specific tool for break-down diagnosis and malfunctioning. The basic knowledge is modeled by the FMECA (Failure Modes and Effects and Criticality Analysis) method. This tool allows to using artificial intelligence in maintenance. The v...

... Search result page. Title: AUTONOMOUS SYSTEM OF ELECTRICITY PRODUCTION FROM A MECHANICAL POWE... more ... Search result page. Title: AUTONOMOUS SYSTEM OF ELECTRICITY PRODUCTION FROM A MECHANICAL POWER GENERATION BASED ON SOLAR-HEATED HFC-134A RANKINE CYCLE. Author: Faouzi Nasri, Chaouki Ali & Habib Ben Bacha. Abstract: ...

Problems related to the decrease of fossil energy, especially in its liquid form (oil) or gas (na... more Problems related to the decrease of fossil energy, especially in its liquid form (oil) or gas (natural gas) and the stocks of uranium available for nuclear energy are now decrease. The burning of fossil resources causes the release of carbon dioxide (CO2) that accumulates in the atmosphere a greenhouse gas (GHG) which would change the balance of global climate. So that many research are interested for renewable energy in their different forms: wind, solar thermal, photovoltaic, hydro, biomass and geothermal, which now represent only 7.5% total world energy. The solar rays are an inexhaustible source of energy throughout the world. It is used in various applications as a source of clean and renewable energy. Indeed it is used in Desalination, air conditioning, cooking. Among this solar thermal applications include electricity generation. This paper reviews the electricity generation from solar thermal energy based specially on solar heated Rrankine cycle. Examples of solar thermal po...

International Review of Mechanical Engineering

This paper presents a new conception of air conditioning prototype powered by solar energy. The i... more This paper presents a new conception of air conditioning prototype powered by solar energy. The installation, composed of four compartments, consists of three functioning modes according to the season of the year and the climatic conditions. The summer-mode with precooling of air is studied. Mathematical models based on heat and mass transfer behaviors in the solar collector, storage tank, humidifier and desiccant wheel have been developed. The system of equations is numerically resolved using a finite volume method to study the behavior of the prototype.

International Review of Mechanical Engineering

HVAC&R RESEARCH

This work deals with the mass and heat transfer of water/silica gel in both adsorption and desorp... more This work deals with the mass and heat transfer of water/silica gel in both adsorption and desorption modes. An original dehumidifier system, based on a circular repetition of several silica gel beds, is proposed as a feasible alternative to the classical dehumidifier systems. Thanks to an appropriate working order ensuring an optimal synchronization between different beds, the proposed design permits regularization of the air humidity ratio and air temperature in the outlet of the dehumidifier system. The simulation of adsorption and desorption modes are carried out for one typical bed. Combined mass and energy differential equations are numerically implemented using the finite-volume method in order to simulate the effect of operating conditions on the temporal behavior of both silica gel moisture content, adsorbent temperature, and air humidity ratio. The obtained results are then presented and interpreted. The rise of humid air temperature (in adsorption mode) and its drop (in d...

International Review of Mechanical Engineering

Plusieurs recherches ce sont focalisées sur un environnement de collaboration télé-partagé pour l... more Plusieurs recherches ce sont focalisées sur un environnement de collaboration télé-partagé pour la conception collaborative. Notamment sur les interfaces utilisateur, les moyens de communication, et les formats d'échange de connaissances qui sont compatibles avec les divers environnements et besoins des acteurs que l'on pourrait trouver dans une équipe de conception multi cites et interdisciplinaire. Dans cet article, nous proposons une approche technologique qui permet aux concepteurs, travaillant sur un même processus de conception, de coexister avec des conflits et des modifications de paramètres, par l'acte de versionnement de connaissance en vue de partager et réutiliser les ressources actives des concepts. En outre nous proposons un mécanisme par lequel des versions existantes de conception peuvent être représentées, combinées et éditées pour fournir de nouvelles conceptions.

The membrane distillation is a process vacuum evaporative using porous membranes such as physical... more The membrane distillation is a process vacuum evaporative using porous membranes such as physical barriers between a liquid and a permeate gas. The vaporization takes place in the liquid / membrane under vacuum. In this process the heat transfer and mass are coupled. The objective here is to determine the operating conditions for a transfer of material importance and low energy consumption in a hollow fiber module applied to water desalination and study modeling the operation mode of the different compartments of the desalination process seawater by the membrane under vacuum and coupling solar energy to describe the behavior of the membrane under vacuum with a numerical simulation to determine the outlet temperature.

This paper present a design of an electricity production system from a mechanical power generatio... more This paper present a design of an electricity production system from a mechanical power generation based on solar heated Rankine cycle operating at low temperature range, developed at the Laboratory of Electromechanical Systems of the National Engineering School of Sfax – Tunisia. The proposed system permits to produce electricity from solar thermal energy and auxiliary heater upon a demand. The dynamic modelling of heat and mass transfer behaviours of the different sections (solar collector, storage tank, evaporator etc.) are presented. The mathematical balance equations are numerically resolved using the finite volume method. The numerical simulation permit to study the behaviour of the system and it would enhance the performance of such installation.

Journal of Energy Storage, 2021

Coatings, 2021

The flow of nanofluids is very important in industrial refrigeration systems. The operation of nu... more The flow of nanofluids is very important in industrial refrigeration systems. The operation of nuclear reactors and the cooling of the entire installation to improve safety and economics are entirely dependent on the application of nanofluids in water. Therefore, a model of Maxwell’s dusty nanofluid with temperature-dependent viscosity, surface suction and variable surface tension under the action of solar radiation is established. The basic equations of momentum and temperature of the dust and liquid phases are solved numerically using the MATLAB bvp4c scheme. In the current evaluation, taking into account variable surface tension and varying viscosity, the effect of dust particles is studied by immersing dust particles in a nanofluid. Qualitative and quantitative discussions are provided to focus on the effect of physical parameters on mass and heat transfer. The propagation results show that this mixing effect can significantly increase the thermal conductivity of nanofluids. Wit...

International Communications in Heat and Mass Transfer, 2021

Journal of Energy Storage, 2020

The potable water shortage is a big problem facing the governments and decision-makers everywhere... more The potable water shortage is a big problem facing the governments and decision-makers everywhere. Solar distiller is one of the techniques that participate in solving this problem. In this work, the impact of internal reflectors on the trays distiller performance was investigated. Besides, the influence of painting the surfaces of the solar still by the mixture of black paint and copper oxide (CuO) nanoparticles was studied. This is to enhance the heat transfer characteristics between the basin surfaces and water. Finally, the impact of using the paraffin wax mixed with CuO nanoparticles as a phase change material (PCM) on the performance of trays distiller was evaluated. Experimental results revealed that the total freshwater yield of the trays distiller was improved by 57, 14, 70.7, and 108% when using reflectors, CuO nanoparticles in paint, reflectors and nano-coating, and the collection of reflectors, nano coating, and PCM with CuO nanoparticles respectively over that of the reference still. Also, the total accumulated freshwater of the conventional and trays solar stills reached 2400 and 5000 mL/ m² a day, respectively. Moreover, the thermal efficiency of the trays distiller with reflectors, nano-paint coating, and PCM-CuO nanoparticles mixture was 51.5%.

International Journal of Ventilation, 2019

This paper proposes an original and sustainable design for a Hybrid solar Air Conditioning-Ventil... more This paper proposes an original and sustainable design for a Hybrid solar Air Conditioning-Ventilation-Humidification-Dehumidification (HDH) desalination system. The proposed design permits to produce both thermal comfort and desalinated water for residential buildings. The originality of the system design as well as its operating principle is described in detail. Mathematical models, that govern the heat and mass transfer in the different compartments of the proposed design and within the conditioned space, are elaborated. A numerical investigation is carried out to assess the heat and mass transfer performance of the designed hybrid system, as well as the produced thermal comfort within the conditioned space. All numerical simulations are carried out under the realistic climatic conditions of the region of Gafsa-Tunisia (34.4311 N, 8.7757 E). Results show that the performance of the proposed design and its ability to produce thermal comfort, in the conditioned space, are within the air conditioning standards. Buildings in hot and arid regions can fully benefit from such a sustainable design.

Heat and Mass Transfer, 2018

This work deals with the dimensioning of multi-packed-bed dehumidifiers used in solar airconditio... more This work deals with the dimensioning of multi-packed-bed dehumidifiers used in solar airconditioning systems. An efficient dimensioning methodology is elaborated, explained and visualized by a chart. The proposed methodology permits to ensure an appropriate packed-bed dimensioning based on a compromise between the highest possible amount of heat and mass transfer and the lowest possible level of pressure drop within a packed-bed-dehumidifier. Nomography tool is implemented in order to simplify, speed up and expand the possibilities of dimensioning. The proposed nomographs permit to determine the appropriate values of the diameter, the porosity and the height of the packed-bed. The mathematical construction techniques of all nomographs are presented in detail. Applied examples are carried out in order to show the effectiveness of each nomograph. NomenclatureSymbols C pa Air specific heat, (J.kg −1 .K −1) C ps Deicccant specific heat, (J.kg −1 .K −1) C pv Water vapor specific heat, (J.kg −1 .K −1) C pw Water specific heat, (J.kg −1 .K −1) D Bed diameter, (m) D 0 Water vapor diffusivity, (m 2 .s −1) D e Effective diffusivity, (m 2 .s −1) d p Desiccant particle diameter, (m) E 0 Activation energy, (J.mol −1) H Bed height, (m) N Number of beds constituting the dehumidifier system, (.) q Desiccant moisture content (kg[H 2 O].kg −1 [dry desiccant]) q ∞ Equilibrium desiccant moisture content (kg[H 2 O].kg −1 [dry desiccant]) R Perfect gas constant, (J.mol −1 .K −1) T inlet Inlet air temperature, (°C) V Air velocity, (m/s) VR Ventilation rate, (m 3 /s) Greek symbols ΔH ads Latent heat of evaporation (J.kg −1) ΔP a Maximum allowable pressure drop, (Pa) ε Bed porosity, (.) λ a Air thermal conductivity, (W.m −1 .K −1) λ s Desiccant thermal conductivity, (W.m −1 .K −1) μ a Air dynamic viscosity, (Pa.s) ρ a Air density, (kg.m −3) ρ s Desiccant density, (kg.m −3) Ø Air relative humidity, (%) ω Air humidity ratio, (kg[water vapor].kg −1 [dry air]) δ 1 , δ 3 , μ 1 , μ 3 Functional Moduli (scale factors)

Desalination, 2017

This work presents a modified solar still with pin fins absorber and external condenser. An exper... more This work presents a modified solar still with pin fins absorber and external condenser. An experimental comparative study is carried out between the modified solar still with pin fins absorber and condenser, still with pin fins absorber and conventional still. This experimental study is conducted to evaluate the thermal behavior (evolutions of absorber and glass temperatures) and the water production performance of the modified solar still with pin fins absorber and condenser compared to other designs. All experiments are carried out under the meteorological conditions of the region of Gafsa-Tunisia during the days 01/26/2016, 01/27/2016 and 01/29/ 2016. Experimental results are presented, quantified and discussed to show the utility of the proposed modified solar still.

Journal of Mechanical Science and Technology, 2016

This paper tackles an optimization approach in order to boost the fresh water production of a new... more This paper tackles an optimization approach in order to boost the fresh water production of a new design of a solar still which is located at Sfax engineering national school in Tunisia. This optimization approach is based upon the above mentioned design's improvement by coupling the conventional solar still into at a condenser, solar air and water collector and humidifier. This new concept of a distiller solar still using humidification-dehumidification processes (HD) is exploited for the desalination purpose. As a result of this work, the humidification-dehumidification processes have an essential effect in improving the solar still performance. Performance has been predicted theoretically in terms of water and inner glass cover temperatures, the inlet temperature of air and water of the new concept of distiller on water condensation rate and fresh water production. A general model based on heat and mass transfers in each component of the unit has been developed in steady dynamic regime. The developed model is used, simulating the HD system, to investigate the influence of the meteorological and operating parameters on the system productivity. The obtained set of ordinary differential equations has been converted to a set of algebraic system of equations by the functional approximation method of orthogonal collocation. The developed model is used to simulate the HD system in order to investigate the steady state behavior of each component of the unit and the entire system exposed to a variation of the entrance parameters and meteorological conditions. The obtained results were compared with those of other studies and the comparison gives a good validity of the present results.

RELIABILITY: THEORY & …, 2007

M. Elleuch, B. Ben, F. Masmoudi Improvement of manufacturing cells with unreliable machines-RTA# ... more M. Elleuch, B. Ben, F. Masmoudi Improvement of manufacturing cells with unreliable machines-RTA# 3-4, 2007, December-Special Issue -54-1. Introduction Group technology (GT) is a manufacturing philosophy that has attracted a lot of attention because of its ...

The International Journal of Advanced Manufacturing Technology, 2016

Résumé. Ce papier présente les différentes étapes réalisées pour la conception et le développemen... more Résumé. Ce papier présente les différentes étapes réalisées pour la conception et le développement d'un système expert pour la maintenance des machines. Le système développé est un outil spécifique dédié au diagnostic des pannes et des dysfonctionnements. La modélisation de la base de connaissance est réalisée en utilisant la méthode AMDEC. Cet outil s'est trouvé bien adapté à l'exploitation de l'intelligence artificielle dans le domaine de la maintenance. La validation du bon fonctionnement du logiciel a été assurée à l'aide d'un exemple pratique d'une machine de surfaçage des verres optiques. Abstract.The different steps to construct the expert systems for maintenance are presented in this paper. The developed system is a specific tool for break-down diagnosis and malfunctioning. The basic knowledge is modeled by the FMECA (Failure Modes and Effects and Criticality Analysis) method. This tool allows to using artificial intelligence in maintenance. The v...

... Search result page. Title: AUTONOMOUS SYSTEM OF ELECTRICITY PRODUCTION FROM A MECHANICAL POWE... more ... Search result page. Title: AUTONOMOUS SYSTEM OF ELECTRICITY PRODUCTION FROM A MECHANICAL POWER GENERATION BASED ON SOLAR-HEATED HFC-134A RANKINE CYCLE. Author: Faouzi Nasri, Chaouki Ali & Habib Ben Bacha. Abstract: ...

Problems related to the decrease of fossil energy, especially in its liquid form (oil) or gas (na... more Problems related to the decrease of fossil energy, especially in its liquid form (oil) or gas (natural gas) and the stocks of uranium available for nuclear energy are now decrease. The burning of fossil resources causes the release of carbon dioxide (CO2) that accumulates in the atmosphere a greenhouse gas (GHG) which would change the balance of global climate. So that many research are interested for renewable energy in their different forms: wind, solar thermal, photovoltaic, hydro, biomass and geothermal, which now represent only 7.5% total world energy. The solar rays are an inexhaustible source of energy throughout the world. It is used in various applications as a source of clean and renewable energy. Indeed it is used in Desalination, air conditioning, cooking. Among this solar thermal applications include electricity generation. This paper reviews the electricity generation from solar thermal energy based specially on solar heated Rrankine cycle. Examples of solar thermal po...

International Review of Mechanical Engineering

This paper presents a new conception of air conditioning prototype powered by solar energy. The i... more This paper presents a new conception of air conditioning prototype powered by solar energy. The installation, composed of four compartments, consists of three functioning modes according to the season of the year and the climatic conditions. The summer-mode with precooling of air is studied. Mathematical models based on heat and mass transfer behaviors in the solar collector, storage tank, humidifier and desiccant wheel have been developed. The system of equations is numerically resolved using a finite volume method to study the behavior of the prototype.

International Review of Mechanical Engineering

HVAC&R RESEARCH

This work deals with the mass and heat transfer of water/silica gel in both adsorption and desorp... more This work deals with the mass and heat transfer of water/silica gel in both adsorption and desorption modes. An original dehumidifier system, based on a circular repetition of several silica gel beds, is proposed as a feasible alternative to the classical dehumidifier systems. Thanks to an appropriate working order ensuring an optimal synchronization between different beds, the proposed design permits regularization of the air humidity ratio and air temperature in the outlet of the dehumidifier system. The simulation of adsorption and desorption modes are carried out for one typical bed. Combined mass and energy differential equations are numerically implemented using the finite-volume method in order to simulate the effect of operating conditions on the temporal behavior of both silica gel moisture content, adsorbent temperature, and air humidity ratio. The obtained results are then presented and interpreted. The rise of humid air temperature (in adsorption mode) and its drop (in d...

International Review of Mechanical Engineering

Plusieurs recherches ce sont focalisées sur un environnement de collaboration télé-partagé pour l... more Plusieurs recherches ce sont focalisées sur un environnement de collaboration télé-partagé pour la conception collaborative. Notamment sur les interfaces utilisateur, les moyens de communication, et les formats d'échange de connaissances qui sont compatibles avec les divers environnements et besoins des acteurs que l'on pourrait trouver dans une équipe de conception multi cites et interdisciplinaire. Dans cet article, nous proposons une approche technologique qui permet aux concepteurs, travaillant sur un même processus de conception, de coexister avec des conflits et des modifications de paramètres, par l'acte de versionnement de connaissance en vue de partager et réutiliser les ressources actives des concepts. En outre nous proposons un mécanisme par lequel des versions existantes de conception peuvent être représentées, combinées et éditées pour fournir de nouvelles conceptions.