Sirine Saidi - Academia.edu (original) (raw)
Papers by Sirine Saidi
DESALINATION AND WATER TREATMENT
This work represents an experimental study of a desalination system based on humidification-dehum... more This work represents an experimental study of a desalination system based on humidification-dehumidification (HDH) using solar energy in the meteorological conditions of Bizerte, Tunisia. This system is essentially composed of a humidifier integrated into a solar collector (solar evaporator) and an underground condenser. The latter, in which moist air produced by the solar evaporator passed, was buried at a depth of 1.25 m. The vapor in the air was transformed into water while reaching the cold walls of the condenser pipe. Subsequently, water was collected at the ends of the pipe. The desalination system was equipped with a measurement system in order to conduct the experimental study. The thermal performance of the HDH desalination unit and the fresh water production were evaluated by measuring soil temperatures, liquid film in the evaporator, humidity and air velocity. Measurements were taken in forced convection. The evolutions of the liquid film temperature along the humidifier plate, the evaporated and the condensate mass flow rates were measured in this work. The influence of air velocity on the freshwater production by the desalination unit was also examined this study. It is shown that, at a velocity of 4.79 m/s, the maximum production capacity was equal to 9.38 kg/d and the maximum GOR of the desalination unit was 74%.
2019 International Conference of Computer Science and Renewable Energies (ICCSRE), 2019
A numerical study of a solar desalination system based on the humidification-dehumidification the... more A numerical study of a solar desalination system based on the humidification-dehumidification thermal process was carried out. Air humidification is carried out in the evaporator by evaporating saline water. Air dehumidification takes place in a condenser where the distilled water is recovered by cooling the moist air coming from the humidifier. To achieve proper dehumidification the countercurrent configuration is considered. Energy needed to evaporate water is provided by solar energy. This study was conducted using a one-dimensional mathematical model to simulate heat and mass transfers that occur in the evaporator and the condenser. The proposed model is based on energy and mass balances of moist air, cooling water and saline water film. The resulting differential equations of ordinary derivatives are solved using the finite difference method in an iterative scheme. The mathematical model is validated against experimental and numerical results. The effect of feed saline water and air temperature at the solar evaporator entrances as well as its insulation thickness on the distillated water production of the desalination unit is studied.
DESALINATION AND WATER TREATMENT, 2017
The present work deals with an experimental study of a solar desalination unit using the humidifi... more The present work deals with an experimental study of a solar desalination unit using the humidification-dehumidification (HDH) process. A bench-scale desalination unit was designed and tested in Bizerte, Tunisia. Humidification is achieved through a humidifier with saline water falling on its absorber plate, and dehumidification is realized by means of a tubular heat-exchanger condenser. The desalination unit operates with open-water and open-air cycles. Thermal performances as well as fresh water production of the HDH desalination unit were evaluated via measurements of air and water temperatures and flow rates. Measurements were conducted in free and forced convection. Special attention was focused on the influence of air velocity on the fresh water production of the desalination unit. The optimal air velocity, corresponding to the maximum of fresh water production, was found to be 3.34 m/s.
Desalination and Water Treatment, 2014
ABSTRACT The present study investigated the experimentation of an inclined solar film evaporator ... more ABSTRACT The present study investigated the experimentation of an inclined solar film evaporator in the meteorological conditions of the town of Bizerte, in Tunisia. The experimental device used in this study has a parallelepiped form. It is primarily constituted by an inclined metal plane plate. A water film falls on the external face of this plate through a porous tissue. A glass cover, placed on a wooden frame put on the plate, is exposed to the solar radiation acting as a solar panel. An ascending air flow enters in the evaporator where it is in direct contact with the falling water film. This experimental device is designed and supplemented by a protocol of measurements to conduct this study. The thermocouples installed along the metal plate were connected to an automatic acquisition making it possible to read and store the measured temperatures values. The evaporated flow is measured by an electronic balance and a stopwatch. The humidity and the air velocities are measured using a digital multifunction device. The series of measurement are carried out in natural and forced convections. The profile of the liquid film temperature and the variation of the evaporated flow are measured for the two convection modes. To quantify the effectiveness of the solar evaporator, the thermal and mass yields are calculated. The results show that the evaporated flow is more significant in forced convection and that the thermal and mass yields of the solar evaporator are higher than 80%.
MATEC Web of Conferences
The present work represents a numerical study of a solar desalination system that operates on the... more The present work represents a numerical study of a solar desalination system that operates on the humidification-dehumidification (HDH) principle. This system consists essentially of a humidifier integrated into a solar collector and a tubular condenser. A mathematical model governing evaporation and condensation in the desalination unit has been elaborated. This model is based on energy and mass balances at the humidifier and the condenser. The work consists essentially of a parametric study to improve the desalination unit production installed at the faculty of sciences of Bizerte, Tunisia.
ABSTRACT Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé re... more ABSTRACT Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé reproduisant le naturel cycle de l'eau, peut être facilement combiné avec l'énergie solaire. L'unité de dessalement installée au laboratoire LETTM a été soumise à une exploitation sur site réel, en concentrant nos mesures sur le film liquide s'écoulant dans l'évaporateur pour bien comprendre le processus d'évaporation, ainsi que le débit d'eau évaporée et distillée est mesuré aussi. Les résultats obtenus montrent que l'évaporation est accélérée lorsqu'on diminue le débit d'alimentation. On a remarqué aussi que l'aspiration de l'air (convection forcée) au niveau du condenseur améliore le rendement de condensation et par conséquent celui de l'unité de dessalement.
Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé reproduisan... more Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé reproduisant le naturel cycle de l'eau, peut être facilement combiné avec l'énergie solaire. L'unité de dessalement installée au laboratoire LETTM a été soumise à une exploitation sur site réel, en concentrant nos mesures sur le film liquide s'écoulant dans l'évaporateur pour bien comprendre le processus d'évaporation, ainsi que le débit d'eau évaporée et distillée est mesuré aussi. Les résultats obtenus montrent que l'évaporation est accélérée lorsqu'on diminue le débit d'alimentation. On a remarqué aussi que l'aspiration de l'air (convection forcée) au niveau du condenseur améliore le rendement de condensation et par conséquent celui de l'unité de dessalement.
DESALINATION AND WATER TREATMENT
This work represents an experimental study of a desalination system based on humidification-dehum... more This work represents an experimental study of a desalination system based on humidification-dehumidification (HDH) using solar energy in the meteorological conditions of Bizerte, Tunisia. This system is essentially composed of a humidifier integrated into a solar collector (solar evaporator) and an underground condenser. The latter, in which moist air produced by the solar evaporator passed, was buried at a depth of 1.25 m. The vapor in the air was transformed into water while reaching the cold walls of the condenser pipe. Subsequently, water was collected at the ends of the pipe. The desalination system was equipped with a measurement system in order to conduct the experimental study. The thermal performance of the HDH desalination unit and the fresh water production were evaluated by measuring soil temperatures, liquid film in the evaporator, humidity and air velocity. Measurements were taken in forced convection. The evolutions of the liquid film temperature along the humidifier plate, the evaporated and the condensate mass flow rates were measured in this work. The influence of air velocity on the freshwater production by the desalination unit was also examined this study. It is shown that, at a velocity of 4.79 m/s, the maximum production capacity was equal to 9.38 kg/d and the maximum GOR of the desalination unit was 74%.
2019 International Conference of Computer Science and Renewable Energies (ICCSRE), 2019
A numerical study of a solar desalination system based on the humidification-dehumidification the... more A numerical study of a solar desalination system based on the humidification-dehumidification thermal process was carried out. Air humidification is carried out in the evaporator by evaporating saline water. Air dehumidification takes place in a condenser where the distilled water is recovered by cooling the moist air coming from the humidifier. To achieve proper dehumidification the countercurrent configuration is considered. Energy needed to evaporate water is provided by solar energy. This study was conducted using a one-dimensional mathematical model to simulate heat and mass transfers that occur in the evaporator and the condenser. The proposed model is based on energy and mass balances of moist air, cooling water and saline water film. The resulting differential equations of ordinary derivatives are solved using the finite difference method in an iterative scheme. The mathematical model is validated against experimental and numerical results. The effect of feed saline water and air temperature at the solar evaporator entrances as well as its insulation thickness on the distillated water production of the desalination unit is studied.
DESALINATION AND WATER TREATMENT, 2017
The present work deals with an experimental study of a solar desalination unit using the humidifi... more The present work deals with an experimental study of a solar desalination unit using the humidification-dehumidification (HDH) process. A bench-scale desalination unit was designed and tested in Bizerte, Tunisia. Humidification is achieved through a humidifier with saline water falling on its absorber plate, and dehumidification is realized by means of a tubular heat-exchanger condenser. The desalination unit operates with open-water and open-air cycles. Thermal performances as well as fresh water production of the HDH desalination unit were evaluated via measurements of air and water temperatures and flow rates. Measurements were conducted in free and forced convection. Special attention was focused on the influence of air velocity on the fresh water production of the desalination unit. The optimal air velocity, corresponding to the maximum of fresh water production, was found to be 3.34 m/s.
Desalination and Water Treatment, 2014
ABSTRACT The present study investigated the experimentation of an inclined solar film evaporator ... more ABSTRACT The present study investigated the experimentation of an inclined solar film evaporator in the meteorological conditions of the town of Bizerte, in Tunisia. The experimental device used in this study has a parallelepiped form. It is primarily constituted by an inclined metal plane plate. A water film falls on the external face of this plate through a porous tissue. A glass cover, placed on a wooden frame put on the plate, is exposed to the solar radiation acting as a solar panel. An ascending air flow enters in the evaporator where it is in direct contact with the falling water film. This experimental device is designed and supplemented by a protocol of measurements to conduct this study. The thermocouples installed along the metal plate were connected to an automatic acquisition making it possible to read and store the measured temperatures values. The evaporated flow is measured by an electronic balance and a stopwatch. The humidity and the air velocities are measured using a digital multifunction device. The series of measurement are carried out in natural and forced convections. The profile of the liquid film temperature and the variation of the evaporated flow are measured for the two convection modes. To quantify the effectiveness of the solar evaporator, the thermal and mass yields are calculated. The results show that the evaporated flow is more significant in forced convection and that the thermal and mass yields of the solar evaporator are higher than 80%.
MATEC Web of Conferences
The present work represents a numerical study of a solar desalination system that operates on the... more The present work represents a numerical study of a solar desalination system that operates on the humidification-dehumidification (HDH) principle. This system consists essentially of a humidifier integrated into a solar collector and a tubular condenser. A mathematical model governing evaporation and condensation in the desalination unit has been elaborated. This model is based on energy and mass balances at the humidifier and the condenser. The work consists essentially of a parametric study to improve the desalination unit production installed at the faculty of sciences of Bizerte, Tunisia.
ABSTRACT Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé re... more ABSTRACT Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé reproduisant le naturel cycle de l'eau, peut être facilement combiné avec l'énergie solaire. L'unité de dessalement installée au laboratoire LETTM a été soumise à une exploitation sur site réel, en concentrant nos mesures sur le film liquide s'écoulant dans l'évaporateur pour bien comprendre le processus d'évaporation, ainsi que le débit d'eau évaporée et distillée est mesuré aussi. Les résultats obtenus montrent que l'évaporation est accélérée lorsqu'on diminue le débit d'alimentation. On a remarqué aussi que l'aspiration de l'air (convection forcée) au niveau du condenseur améliore le rendement de condensation et par conséquent celui de l'unité de dessalement.
Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé reproduisan... more Le dessalement par évapo-condensation est un procédé simple et économique. Ce procédé reproduisant le naturel cycle de l'eau, peut être facilement combiné avec l'énergie solaire. L'unité de dessalement installée au laboratoire LETTM a été soumise à une exploitation sur site réel, en concentrant nos mesures sur le film liquide s'écoulant dans l'évaporateur pour bien comprendre le processus d'évaporation, ainsi que le débit d'eau évaporée et distillée est mesuré aussi. Les résultats obtenus montrent que l'évaporation est accélérée lorsqu'on diminue le débit d'alimentation. On a remarqué aussi que l'aspiration de l'air (convection forcée) au niveau du condenseur améliore le rendement de condensation et par conséquent celui de l'unité de dessalement.