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Swellam W Sharshi - One of the best experts on this subject based on the ideXlab platform.
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a hybrid desalination system using Humidification deHumidification and solar stills integrated with evacuated solar water heater
Energy Conversion and Management, 2016Co-Authors: Swellam W Sharshi, Guilong Peng, Nuo Yang, Mohamed A Eltawil, Mohamed Kamal Ahmed Ali, A E KabeelAbstract:Abstract This paper offers a hybrid solar desalination system comprising a Humidification-deHumidification and four solar stills. The developed hybrid desalination system reuses the drain warm water from Humidification-deHumidification to feed solar stills to stop the massive warm water loss during desalination. Reusing the drain warm water increases the gain output ratio of the system by 50% and also increased the efficiency of single solar still to about 90%. Furthermore, the production of a single solar still as a part of the hybrid system was more than that of the conventional one by approximately 200%. The daily water production of the conventional one, single solar still, four solar still, Humidification- deHumidification and hybrid system were 3.2, 10.5, 42, 24.3 and 66.3 kg/day, respectively. Furthermore, the cost per unit liter of distillate from conventional one, Humidification- deHumidification and hybrid system were around $0.049, $0.058 and $0.034, respectively.
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mathematical and experimental investigation of a solar Humidification deHumidification desalination unit
Desalination, 2015Co-Authors: Mofreh H Hamed, A E Kabeel, Swellam W Sharshi, Z M OmaraAbstract:Abstract In this paper, performance of a proposed desalination system based on air Humidification–deHumidification (HDH) is investigated theoretically and experimentally. To evaluate the performance and productivity of the proposed solar Humidification–deHumidification desalination unit, a theoretical simulation model is developed in which the energy equations of each component are considered. Productivity of the proposed system at different operating times during the day is calculated in two periods. First one starts at 9 am and ends at 17 pm, while the second starts after preheating before entering the humidifier at 13 pm to 17 pm. The results show that the highest fresh water productivity is found to be in the second period. A comparison between experimental and theoretical results shows a good agreement and gives evidence that the proposed model is valid to be used under different boundary conditions. The results also show that when the system operates 4 h in a day with preheating before it gives higher productivity of about 22 L/day (11 L/day·m 2 of collector) as a result of stored energy in the system since sunrise. The total cost per 1 l for the unit is 0.0578$.
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water desalination using a Humidification deHumidification technique a detailed review
Natural Resources, 2013Co-Authors: A E Kabeel, Mofreh H Hamed, Z M Omara, Swellam W SharshiAbstract:Solar Humidification-deHumidification desalination technology has been reviewed in detail in this paper. This review would also throw light on the scope for further research and recommendations in active distillation system by Humidification and deHumidification (HDH). Also in this article, a review has been done on different types of (HDH) systems. Thermal modeling was done for various types of Humidification and deHumidification(HDH) distillation system. From the present review, it is found that the Humidification-deHumidification desalination process HDH will be a suitable choice for fresh water production when the demand is decentralized. HDH is a low temperature process where total required thermal energy can be obtained from solar energy. Capacity of HDH units is between that produced by conventional methods and solar stills. Moreover, HDH is distinguished by simple operation and maintenance. Also from the present condensed review, it was observed that an increase in evaporator and condenser surface areas significantly improves system productivity. But prior to implementing any techniques in design improvement, it is necessary to optimize the MEH unit by optimizing its component size to understand the effect of feed water and air flow rates. Although a fair amount of simulation studies have been conducted in the past, further design simulation is required to fully understand the complicated effects of air and water flow rates, the optimum size of individual components or modules of the unit and to generate a comprehensive model for the system.
A E Kabeel - One of the best experts on this subject based on the ideXlab platform.
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a hybrid desalination system using Humidification deHumidification and solar stills integrated with evacuated solar water heater
Energy Conversion and Management, 2016Co-Authors: Swellam W Sharshi, Guilong Peng, Nuo Yang, Mohamed A Eltawil, Mohamed Kamal Ahmed Ali, A E KabeelAbstract:Abstract This paper offers a hybrid solar desalination system comprising a Humidification-deHumidification and four solar stills. The developed hybrid desalination system reuses the drain warm water from Humidification-deHumidification to feed solar stills to stop the massive warm water loss during desalination. Reusing the drain warm water increases the gain output ratio of the system by 50% and also increased the efficiency of single solar still to about 90%. Furthermore, the production of a single solar still as a part of the hybrid system was more than that of the conventional one by approximately 200%. The daily water production of the conventional one, single solar still, four solar still, Humidification- deHumidification and hybrid system were 3.2, 10.5, 42, 24.3 and 66.3 kg/day, respectively. Furthermore, the cost per unit liter of distillate from conventional one, Humidification- deHumidification and hybrid system were around $0.049, $0.058 and $0.034, respectively.
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mathematical and experimental investigation of a solar Humidification deHumidification desalination unit
Desalination, 2015Co-Authors: Mofreh H Hamed, A E Kabeel, Swellam W Sharshi, Z M OmaraAbstract:Abstract In this paper, performance of a proposed desalination system based on air Humidification–deHumidification (HDH) is investigated theoretically and experimentally. To evaluate the performance and productivity of the proposed solar Humidification–deHumidification desalination unit, a theoretical simulation model is developed in which the energy equations of each component are considered. Productivity of the proposed system at different operating times during the day is calculated in two periods. First one starts at 9 am and ends at 17 pm, while the second starts after preheating before entering the humidifier at 13 pm to 17 pm. The results show that the highest fresh water productivity is found to be in the second period. A comparison between experimental and theoretical results shows a good agreement and gives evidence that the proposed model is valid to be used under different boundary conditions. The results also show that when the system operates 4 h in a day with preheating before it gives higher productivity of about 22 L/day (11 L/day·m 2 of collector) as a result of stored energy in the system since sunrise. The total cost per 1 l for the unit is 0.0578$.
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a hybrid solar desalination system of air Humidification deHumidification and water flashing evaporation part i a numerical investigation
Desalination, 2014Co-Authors: A E Kabeel, Emad M S ElsaidAbstract:Abstract This paper presents a hybrid solar desalination system consisting of a Humidification–deHumidification unit and single stage flashing evaporation unit. The hybrid solar desalination system was studied numerically. The heat and mass transfer and flow field are modeled theoretically in two dimensions using the finite difference scheme. For different operating and weather conditions, the fresh water productivity and salinity are computed. The model is developed to investigate the steady-state behavior of each component of the system. Six main parameters that have influence on the system productivity are studied; feed water mass flow rate of SSF unit, feed water mass flow rate of HDH unit, cooling water mass flow rate of SSF unit, cooling water mass flow rate of HDH unit, air mass flow rate and inlet cooling water temperature. The results show that, the studied hybrid desalination system gives a significant operational compatibility between the air Humidification–deHumidification method and flash evaporation desalination with daily water production up to 11.14 kg/m2/day. The efficiency of the system is measured by the gained output ratio (GOR) with day time. The gained output ratio (GOR) of the system reaches 4.5. The effect of the water and the air solar heaters collecting areas on the system productivity is measured. The trend of air solar heater collecting area variation showed a pronounced increase in the fresh water productivity than that of the water solar heater collecting area variation.
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water desalination using a Humidification deHumidification technique a detailed review
Natural Resources, 2013Co-Authors: A E Kabeel, Mofreh H Hamed, Z M Omara, Swellam W SharshiAbstract:Solar Humidification-deHumidification desalination technology has been reviewed in detail in this paper. This review would also throw light on the scope for further research and recommendations in active distillation system by Humidification and deHumidification (HDH). Also in this article, a review has been done on different types of (HDH) systems. Thermal modeling was done for various types of Humidification and deHumidification(HDH) distillation system. From the present review, it is found that the Humidification-deHumidification desalination process HDH will be a suitable choice for fresh water production when the demand is decentralized. HDH is a low temperature process where total required thermal energy can be obtained from solar energy. Capacity of HDH units is between that produced by conventional methods and solar stills. Moreover, HDH is distinguished by simple operation and maintenance. Also from the present condensed review, it was observed that an increase in evaporator and condenser surface areas significantly improves system productivity. But prior to implementing any techniques in design improvement, it is necessary to optimize the MEH unit by optimizing its component size to understand the effect of feed water and air flow rates. Although a fair amount of simulation studies have been conducted in the past, further design simulation is required to fully understand the complicated effects of air and water flow rates, the optimum size of individual components or modules of the unit and to generate a comprehensive model for the system.
Anke Hagen - One of the best experts on this subject based on the ideXlab platform.
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effect of cathode gas Humidification on performance and durability of solid oxide fuel cells
Solid State Ionics, 2010Co-Authors: Jimmi Nielsen, Anke HagenAbstract:The effect of cathode inlet gas Humidification was studied on single anode supported Solid Oxide Fuel Cells (SOFC's). The studied cells were Riso 2 G and 2.5 G. The former consists of a LSM:YSZ composite cathode, while the latter consists of a LSCF:CGO composite cathode on a CGO protection layer respectively. A clear effect of Humidification was observed for 2 G cells with a fast transient upon Humidification followed by an ongoing long term passivation/degradation during Humidification. Removal of Humidification resulted in a partial regain of the cell voltage prior to Humidification. The Humidification effect was found to be dependent on both the degree of Humidification and the cathode polarization. No significant effect of Humidification was found at OCV which rules out the possibility of a traditional poisoning effect with a blocking of active sites. Post-mortem high resolution FEG-SEM analysis showed clear changes at and around the cathode/electrolyte contact area. In contrast to Riso 2 G cells, a very high tolerance towards Humidification of cathode gas air was observed for Riso 2.5 G cells with no detectable effect of Humidification even when the Humidification was as high as 12.8 mol%.
Mohammed A Anta - One of the best experts on this subject based on the ideXlab platform.
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Humidification deHumidification desalination system operated by a heat pump
Energy Conversion and Management, 2018Co-Authors: Dahiru U Lawal, Syed M Zubai, Atia E Khalifa, Mohammed A Anta, Fahad A AlsulaimaAbstract:Abstract Humidification-deHumidification is a carrier gas based thermal technique that is ideal for small-scale water desalination applications. One advantage of Humidification-deHumidification systems is the ability to utilize low grade and renewable energies as heat source to drive the system. This work presents theoretical investigation of Humidification-deHumidification desalination system operated by a heat pump. The model is based on the first law of thermodynamics, describing heat and mass transfer in the combined Humidification-deHumidification-heat pump cycle. The model predicts the performance of closed-air open-water water-heated, and modified air-heated cycle coupled with a heat pump. To improve the Gain output ratio and energy recovery of the system, a heat pump is used as the source of heating and cooling for the Humidification-deHumidification desalination system. Energy rejected in the condenser is used as a source of heat in the humidifier whereas the cooling effect of the evaporator is used to cool incoming seawater for effective condensation of humid air in the dehumidifier. A parametric study is conducted to investigate the influence of system operating parameters, including water and air flowrate, seawater temperature, and refrigerant flow rate on the system performance. Results indicate a maximum Gain output ratio of 8.88 and 7.63 obtained at 80% components effectiveness and mass flow rate ratio of 0.63 and 1.3 for modified air heated and water heated cycle, respectively. A maximum gain output ratio greater than 10 can be achieved for humidifier and dehumidifier effectiveness of 100% leading to more energy efficient systems. The cost of desalinated water production is calculated and the effect of major parameters on its variation is also presented.
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Humidification deHumidification desalination system using parabolic trough solar air collector
Applied Thermal Engineering, 2015Co-Authors: Fahad A Alsulaima, Ifras M Zubai, Salem A Aldini, Maimoo Atif, P Gandhidasa, Mohammed A AntaAbstract:This paper deals with a detailed thermodynamic analysis to assess the performance of an HDH system with an integrated parabolic trough solar collector (PTSC). The HDH system considered is an open air, open water, air heated system that uses a PTSC as an air heater. Two different configurations were considered of the HDH system. In the first configuration, the solar air heater was placed before the humidifier whereas in the second configuration the solar air heater was placed between the humidifier and the dehumidifier. The current study revealed that PTSCs are well suited for air heated HDH systems for high radiation location, such as Dhahran, Saudi Arabia. The comparison between the two HDH configurations demonstrates that the gained output ratio (GOR) of the first configuration is, on average, about 1.5 whereas for the second configuration the GOR increases up to an average value of 4.7. The study demonstrates that the HDH configuration with the air heater placed between the humidifier and the dehumidifier has a better performance and a higher productivity.
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optimum thermal design of Humidification deHumidification desalination systems
Desalination, 2014Co-Authors: Mostafa H Sharqawy, Syed M Zubai, Mohammed A Anta, Abubake M ElbashiAbstract:Abstract Humidification deHumidification (HDH) process is used for producing fresh water from saline water at sub-boiling temperature. This process uses a low-temperature source such as solar energy or waste heat source. Although these heat sources are available with minimal operating cost, an optimum thermal design is required to maximize the water production rate for a given heat input. In this paper, the main design and performance parameters are investigated for two HDH cycles namely, water-heated and air-heated cycles. First-law based thermal analyses are provided and performance charts are presented by considering assumptions. The design details of both the humidifier and dehumidifier are presented to determine their sizes under different design conditions. It has been demonstrated that optimum mass flow rate ratios exist for each cycle such that the gained-output ratio (GOR) is maximized. In addition, it is demonstrated that higher GOR can be obtained by using large-size humidifiers and dehumidifiers due to increasing their effectiveness. Moreover, increasing the temperature of water entering the humidifier reduces GOR for the water-heated cycle whereas it increases for the air-heated cycle. A comparison is also carried out between the two cycles to provide guidelines for designers in terms of, power requirements and components size.
Said Alhallaj - One of the best experts on this subject based on the ideXlab platform.
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solar desalination with Humidification deHumidification cycle review of economics
Desalination, 2006Co-Authors: Said Alhallaj, Mohammed M Farid, Sandeep Parekh, J R SelmaAbstract:Abstract Major desalination processes consume a large amount of energy derived from oil and natural gas as heat and electricity, while emitting harmful CO 2 . Solar desalination has emerged as a promising renewable energy-powered technology for producing fresh water. Combining the principle of Humidification-deHumidification with solar desalination results in an increase in the overall efficiency of the desalination plant, and therefore appears to be the best method of water desalination with solar energy. A detailed study of the mechanism of this process is presented in this report, along with an economical evaluation of the process. Comparison of the costs of currently available solar desalination processes presented in this report leads to the conclusion that a better understanding of this method of solar desalination is highly desirable. Simulation verification and design optimisation by varying the three major components (humidifier, condenser and collector surface areas) of the unit is perhaps a critical step in the commercialization of a solar desalination process based on the Humidification–deHumidification principle.
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solar desalination with a Humidification deHumidification cycle mathematical modeling of the unit
Desalination, 2003Co-Authors: Mohammed M Farid, Sandeep Parekh, J R Selma, Said AlhallajAbstract:Abstract Solar desalination is gradually emerging as a successful renewable energy source of producing fresh water. Solar Multi-Effect Humidification (MEH) units based on the Humidification-deHumidification principle are considered as the most viable among solar desalination units. A simulation study of these units leads to a better understanding of the performance of such type of desalination units. This study therefore focuses on studying and analysing the effects and performance of various components involved in the process along with the study of the effect of water feed flow rate on the desalination production. To our knowledge, there is no such comprehensive model available in the literature. This study could lead a step further in the commercialisation of solar desalination units based on the Humidification-deHumidification principle.
