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Dr. Ramy Mohammed
Zagazig University

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0 HVAC
0 Water - Food - Energy Nexus
0 Desalination and Water Treatments
0 Adsorption and adsorbents
0 Energy Efficiency

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Review article
Published: 08 July 2021 in npj Clean Water
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Removal of heavy metal ions from wastewater is of prime importance for a clean environment and human health. Different reported methods were devoted to heavy metal ions removal from various wastewater sources. These methods could be classified into adsorption-, membrane-, chemical-, electric-, and photocatalytic-based treatments. This paper comprehensively and critically reviews and discusses these methods in terms of used agents/adsorbents, removal efficiency, operating conditions, and the pros and cons of each method. Besides, the key findings of the previous studies reported in the literature are summarized. Generally, it is noticed that most of the recent studies have focused on adsorption techniques. The major obstacles of the adsorption methods are the ability to remove different ion types concurrently, high retention time, and cycling stability of adsorbents. Even though the chemical and membrane methods are practical, the large-volume sludge formation and post-treatment requirements are vital issues that need to be solved for chemical techniques. Fouling and scaling inhibition could lead to further improvement in membrane separation. However, pre-treatment and periodic cleaning of membranes incur additional costs. Electrical-based methods were also reported to be efficient; however, industrial-scale separation is needed in addition to tackling the issue of large-volume sludge formation. Electric- and photocatalytic-based methods are still less mature. More attention should be drawn to using real wastewaters rather than synthetic ones when investigating heavy metals removal. Future research studies should focus on eco-friendly, cost-effective, and sustainable materials and methods.

ACS Style

Naef A. A. Qasem; Ramy H. Mohammed; Dahiru U. Lawal. Removal of heavy metal ions from wastewater: a comprehensive and critical review. npj Clean Water 2021, 4, 1 -15.

AMA Style

Naef A. A. Qasem, Ramy H. Mohammed, Dahiru U. Lawal. Removal of heavy metal ions from wastewater: a comprehensive and critical review. npj Clean Water. 2021; 4 (1):1-15.

Chicago/Turabian Style

Naef A. A. Qasem; Ramy H. Mohammed; Dahiru U. Lawal. 2021. "Removal of heavy metal ions from wastewater: a comprehensive and critical review." npj Clean Water 4, no. 1: 1-15.

Journal article
Published: 30 January 2021 in Sustainability
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Water shortage, human population increase, and lack of food resources have directed societies towards sustainable energy and water resources, especially for agriculture. While open agriculture requires a massive amount of water and energy, the requirements of horticultural systems can be controlled to provide standard conditions for the plants to grow, with significant decrease in water consumption. A greenhouse is a transparent indoor environment used for horticulture, as it allows for reasonable control of the microclimate conditions (e.g., temperature, air velocity, rate of ventilation, and humidity). While such systems create a controlled environment for the plants, the greenhouses need ventilation to provide fresh air. In order to have a sustainable venting mechanism, a novel solution has been proposed in this study providing a naturally ventilating system required for the plants, while at the same time reducing the energy requirements for cooling or other forced ventilation techniques. Computational fluid dynamics (CFD) was used to analyse the ventilation requirements for different vent opening scenarios, showing the importance of inlet locations for the proposed sustainable greenhouse system.

ACS Style

Mohammad Akrami; Can Mutlum; Akbar Javadi; Alaa Salah; Hassan Fath; Mahdieh Dibaj; Raziyeh Farmani; Ramy Mohammed; Abdelazim Negm. Analysis of Inlet Configurations on the Microclimate Conditions of a Novel Standalone Agricultural Greenhouse for Egypt Using Computational Fluid Dynamics. Sustainability 2021, 13, 1446 .

AMA Style

Mohammad Akrami, Can Mutlum, Akbar Javadi, Alaa Salah, Hassan Fath, Mahdieh Dibaj, Raziyeh Farmani, Ramy Mohammed, Abdelazim Negm. Analysis of Inlet Configurations on the Microclimate Conditions of a Novel Standalone Agricultural Greenhouse for Egypt Using Computational Fluid Dynamics. Sustainability. 2021; 13 (3):1446.

Chicago/Turabian Style

Mohammad Akrami; Can Mutlum; Akbar Javadi; Alaa Salah; Hassan Fath; Mahdieh Dibaj; Raziyeh Farmani; Ramy Mohammed; Abdelazim Negm. 2021. "Analysis of Inlet Configurations on the Microclimate Conditions of a Novel Standalone Agricultural Greenhouse for Egypt Using Computational Fluid Dynamics." Sustainability 13, no. 3: 1446.

Journal article
Published: 23 January 2021 in Energy Conversion and Management
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Efficient utilization of waste heat to run a power and desalination systems is a key technology to mitigate the energy-water crisis. Organic Rankine Cycle (ORC) is one of the promising systems that can exploit low-grade waste heat. So, this paper introduces a novel ORC-based poly-generation system driven by waste heat to produce electrical, cooling, and heating power. The poly-generation system is integrated with multi-effect desalination (MED) system for freshwater production as well. Energy, exergy, and exergo-economic (3E) investigations are made to assess the feasibility of integration of the proposed novel ORC to MED cycle. The new ORC has an adjustable three-way valve to control the seasonal requirement of electrical, heating, and cooling power. Performance of the suggested multi-generation ORC/MED is evaluated by calculating the plant electrical efficiency (ηelec), energy utilization factor (EUF), overall exergy efficiency (ηex), total product unit cost (cp,tot), electricity cost Celec, total water price (TWP), and exergo-economic factor fk. It is found that the base case of the proposed multi-generation ORC/MED plant could produce electrical power of 8.055 MW at a cost of 1.035 ¢/kWh, cooling power of 5.239 MW, heating power of 7.579 MW, and freshwater of 66.55 m3/h for 0.4136 $/m3. While the ηelec,EUF,ηex,andcp,tot are 13.38%, 53.27%, 37.22%, and 2.877 $/GJ, respectively. The parametric study indicates that adjusting the ratio of electric power generation to cooling power production has a significant impact on the thermo-economic efficiency of the ORC/MED plant and does not have any effect on the freshwater production. The multi-objective optimization analyses show that the electrical power, cooling power and EUF of the optimized case improve by 16%, 306.6% and 50%, respectively, and the cp,tot and Celec decrease by 16% and 9.5%, respectively.

ACS Style

Ramy H. Mohammed; Mostafa M. Ibrahim; Ahmad Abu-Heiba. Exergoeconomic and multi-objective optimization analyses of an organic Rankine cycle integrated with multi-effect desalination for electricity, cooling, heating power, and freshwater production. Energy Conversion and Management 2021, 231, 113826 .

AMA Style

Ramy H. Mohammed, Mostafa M. Ibrahim, Ahmad Abu-Heiba. Exergoeconomic and multi-objective optimization analyses of an organic Rankine cycle integrated with multi-effect desalination for electricity, cooling, heating power, and freshwater production. Energy Conversion and Management. 2021; 231 ():113826.

Chicago/Turabian Style

Ramy H. Mohammed; Mostafa M. Ibrahim; Ahmad Abu-Heiba. 2021. "Exergoeconomic and multi-objective optimization analyses of an organic Rankine cycle integrated with multi-effect desalination for electricity, cooling, heating power, and freshwater production." Energy Conversion and Management 231, no. : 113826.

Journal article
Published: 02 October 2020 in Journal of Cleaner Production
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Adsorption desalination system (ADS) is being considered to mitigate the gap between water demand and availability. This research work proposes a new integration between ADS and a liquid-vapor ejector to increase the freshwater productivity by many folds. Two different schemes are proposed. The first scheme is adopted for cooling applications (ACEJ), while the second one is mainly used for desalination applications (ADEJ). Besides, internal heat recovery is applied between the condenser and evaporator in the ADEJ cycle for further enhancement in the overall system performance. A numerical model is built to investigate the effectiveness of the two proposed configurations at various operating conditions. The present results are compared with those of the standalone adsorption cooling system (ACS) and ADS. ADEJ with heat recovery produce a specific daily freshwater of 52.67 m3/ton of silica gel using 95 oC desorption temperature. This value is higher than the one produced by the ADS by a factor of 5.0. Integrating an ejector to silica gel/water ADS achieves a COP of 1.47, which is higher than that of ADS by a factor of 2.7.

ACS Style

Ehab S. Ali; Ramy H. Mohammed; Ahmed Askalany. A daily freshwater production of 50 m3/ton of silica gel using an adsorption-ejector combination powered by low-grade heat. Journal of Cleaner Production 2020, 282, 124494 .

AMA Style

Ehab S. Ali, Ramy H. Mohammed, Ahmed Askalany. A daily freshwater production of 50 m3/ton of silica gel using an adsorption-ejector combination powered by low-grade heat. Journal of Cleaner Production. 2020; 282 ():124494.

Chicago/Turabian Style

Ehab S. Ali; Ramy H. Mohammed; Ahmed Askalany. 2020. "A daily freshwater production of 50 m3/ton of silica gel using an adsorption-ejector combination powered by low-grade heat." Journal of Cleaner Production 282, no. : 124494.

Journal article
Published: 06 September 2020 in Energy Conversion and Management
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Supercritical CO2 cycle has an optimal performance when the cycle minimum temperature is around the critical temperature (31 °C), which is impossible at hot climatic conditions. To solve this problem, this work hybridizes a supercritical CO2 cycle with an ejector refrigeration cycle (ERC) to cool the minimum temperature of the cycle to be about 31 °C and hence achieving the highest possible performance. Comprehensive energy, exergy, and economic analyses are carried out to explore the mechanisms of performance improvement of the novel combined plant. Sensitivity analysis is performed to recognize the most influencing parameters on the performance of the combined plant. Based on the sensitivity analysis, the effect of different operating and design parameters on the system performance is investigated. Furthermore, a multi-objective optimization study is performed to find the trade-off between exergy efficiency and cost-saving. Among the different the five refrigerants used for ERC, the results illustrate that R717 is the most efficient one for the present hybridization. The exergy destruction in the precooler reduces from 15.5% to 0.7% when ERC is combined with the sCO2 cycle. Thus, the energy efficiency (ηth) and exergy efficiency (ηex) increase by 9.5%, while the levelized cost of energy (LCOE) declines by 10.7%. Compared with the standalone sCO2 cycle, the produced power, ηth, ηex, and LCOE of the optimized plant improve by 94.3%, 36.2%, 28.6%, and 18.3%, respectively.

ACS Style

Ramy H. Mohammed; Naef A.A. Qasem; Syed M. Zubair. Enhancing the thermal and economic performance of supercritical CO2 plant by waste heat recovery using an ejector refrigeration cycle. Energy Conversion and Management 2020, 224, 113340 .

AMA Style

Ramy H. Mohammed, Naef A.A. Qasem, Syed M. Zubair. Enhancing the thermal and economic performance of supercritical CO2 plant by waste heat recovery using an ejector refrigeration cycle. Energy Conversion and Management. 2020; 224 ():113340.

Chicago/Turabian Style

Ramy H. Mohammed; Naef A.A. Qasem; Syed M. Zubair. 2020. "Enhancing the thermal and economic performance of supercritical CO2 plant by waste heat recovery using an ejector refrigeration cycle." Energy Conversion and Management 224, no. : 113340.

Journal article
Published: 11 August 2020 in Energy Conversion and Management
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Adsorption desalination (AD) and humidification-dehumidification desalination (HDH) technologies are attractive since they can be powered by low-grade energy sources and can be constructed on a small scale. This paper adopts a novel hybrid AD-(water-heated) HDH system to produce freshwater and cooling power, simultaneously. The system is mainly powered by a low-grade energy source (natural gas), while photovoltaic (PV) panels are used to run the auxiliary components such as pumps, and blowers. A detailed thermoeconomic model is developed to explore the effect of different parameters on the system performance and products’ cost. This analysis reveals that the system can deliver, at its optimal operating conditions, 21.75 kg of freshwater per hour for 1.15 ȼ/liter with a gained output ratio (GOR) of 2.50. The coefficient of performance (COP) and the cooling capacity of the proposed system are recorded at 0.46 and 2.53 kW, respectively. Besides, a comparison between the proposed hybrid system and a traditional standalone water-heated HDH unit is performed. This comparison shows that the GOR value of the hybrid system is always higher than that of the standalone HDH (about 350% increase). This trend indicates that the proposed system significantly improves overall performance. Considerable saving in the freshwater cost (from 30 to 40%) is also attained.

ACS Style

Muhammad H. Elbassoussi; Ramy H. Mohammed; Syed M. Zubair. Thermoeconomic assessment of an adsorption cooling/desalination cycle coupled with a water-heated humidification-dehumidification desalination unit. Energy Conversion and Management 2020, 223, 113270 .

AMA Style

Muhammad H. Elbassoussi, Ramy H. Mohammed, Syed M. Zubair. Thermoeconomic assessment of an adsorption cooling/desalination cycle coupled with a water-heated humidification-dehumidification desalination unit. Energy Conversion and Management. 2020; 223 ():113270.

Chicago/Turabian Style

Muhammad H. Elbassoussi; Ramy H. Mohammed; Syed M. Zubair. 2020. "Thermoeconomic assessment of an adsorption cooling/desalination cycle coupled with a water-heated humidification-dehumidification desalination unit." Energy Conversion and Management 223, no. : 113270.

Journal article
Published: 05 November 2019 in Applied Thermal Engineering
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Performance of two types of desiccant silica gel aluminum foam heat exchangers - desiccant coated heat exchanger (DCHE) and desiccant packed heat exchanger (DPHE) are evaluated experimentally and numerically. The DCHE is fabricated by coating silica gel over the ligaments of an aluminum foam, while the DPHE is built by packing an aluminum foam with silica particles. Equilibrium isotherms of the two heat exchangers are measured using the gravimetric approach. An open flow loop test rig is designed and built to measure the dry bulb temperature and humidity ratio of air upstream and downstream of the desiccant heat exchangers during the humidification and dehumidification process. In addition, a mathematical model is developed to investigate the heat and mass transfer process in the two desiccant heat exchangers. The experimental data obtained are used to validate the numerical results, and good agreement is established. The effects of heat exchanger length and inlet operating conditions on the performance of DPHE and DCHE are investigated. Experimental and numerical results indicate that the DPHE outperforms the DCHE in terms of cooling capacity and moisture removal capacity. It is observed that the performance of the DPHE is close to that of the DCHE in handling sensible heat loads but exceeds the latter in removing latent heat loads. The DPHE can provide dehumidified air for a longer time due to its higher moisture removal ability and higher density of the desiccant material compared to the DCHE.

ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Ruiqing Huo; Ming Su; Louis C. Chow. Performance of desiccant heat exchangers with aluminum foam coated or packed with silica gel. Applied Thermal Engineering 2019, 166, 114626 .

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Ruiqing Huo, Ming Su, Louis C. Chow. Performance of desiccant heat exchangers with aluminum foam coated or packed with silica gel. Applied Thermal Engineering. 2019; 166 ():114626.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Ruiqing Huo; Ming Su; Louis C. Chow. 2019. "Performance of desiccant heat exchangers with aluminum foam coated or packed with silica gel." Applied Thermal Engineering 166, no. : 114626.

Journal article
Published: 20 March 2019 in International Journal of Refrigeration
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Effective thermal conductivity of a silica-gel/water adsorption packed bed is significantly enhanced by placing silica-gel particles in a high-porosity aluminum (AL) foam. The enhancement leads to several folds increase in the specific cooling power (SCP), cooling capacity per unit volume (CPv) and coefficient of performance (COP) of an adsorption cooling (AC) chiller. The thermal response and adsorption kinetics of various silica-gel/AL foam beds under typical operating conditions are investigated experimentally and numerically. Effect of pores per inch (PPI) of the foam, silica-gel particle size, bed height and adsorption isotherm of different types of silica-gel on the bed performance are investigated. The results reveal that the AL foam with 20 PPI is recommended for adsorption cooling applications due to its high surface area and small cell size. 20 PPI AL foam can deliver a SCP of 827 W/kg, a CPv of 517 W/m3 and a COP of 0.75.

ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. Performance enhancement of adsorption beds with silica-gel particles packed in aluminum foams. International Journal of Refrigeration 2019, 104, 201 -212.

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Louis C. Chow. Performance enhancement of adsorption beds with silica-gel particles packed in aluminum foams. International Journal of Refrigeration. 2019; 104 ():201-212.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. 2019. "Performance enhancement of adsorption beds with silica-gel particles packed in aluminum foams." International Journal of Refrigeration 104, no. : 201-212.

Journal article
Published: 21 December 2018 in International Journal of Refrigeration
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A lab-scale adsorption unit is designed and constructed to investigate its efficacy under typical operating conditions of a practical adsorption cooling system. A detailed coupled heat and mass transfer (CHMT) model and a lumped parameter (LP) model are implemented to estimate the Specific Cooling Power (SCP) of an adsorption cooling system using silica gel/water as the working pair. It is found that the optimal cycle time can be predicted by using the LP model. Results show that the SCP obtained from the CHMT model is always higher than that measured from the experiment because the dynamic effect of the evaporator is not considered. The LP model, with its input parameters estimated by the CHMT, actually produces reliable estimates of the SCP because the evaporator dynamic effect is considered. The difference between the two models is higher at shorter cycle times because the evaporator pressure drop is very high at the beginning of the adsorption process. Without considering this pressure drop, the CHMT yields a higher SCP compared to that calculated from the LP model. In view of the evaporator pressure variation during the adsorption process, a modified CHMT model that considers the evaporator dynamic behavior is developed. It is shown that the modified CHMT model can be used to evaluate the performance of an adsorption bed and to estimate the SCP accurately.

ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. Assessment of numerical models in the evaluation of adsorption cooling system performance. International Journal of Refrigeration 2018, 99, 166 -175.

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Louis C. Chow. Assessment of numerical models in the evaluation of adsorption cooling system performance. International Journal of Refrigeration. 2018; 99 ():166-175.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. 2018. "Assessment of numerical models in the evaluation of adsorption cooling system performance." International Journal of Refrigeration 99, no. : 166-175.

Journal article
Published: 29 October 2018 in Energy
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An exergo-economic model is used to assess the performance of a multi-effect desalination plant integrated to a mechanical vapor compressor unit (MED-MVC) with a water production capacity of 1500 m3/day. The results show that the second law efficiency () is 2.8%. The MVC and evaporator units are responsible for about 39 and 52% of the total exergy destruction, respectively. The total water price (TWP) is 1.70 $/m3 when calculated using a simple conventional economic model and 1.63 $/m3 when calculated using an exergy-based cost model. Increasing the number of effects from 1 to 6 results in a 39% reduction in the specific power consumption (SPC), a 70% increase in and a 24% decrease in TWP. A dynamic model is developed to investigate the effect of fluctuations of compressor work () and inlet seawater temperature () on the plant behavior and performance. The dynamic model results show that the disturbance in has a significant effect on the plant transient behavior and may cause the plant to cease operation while a disturbance in has only a moderate impact. Increasing above a certain value of the steady-state condition without proper control on the plant response could lead to evaporator dry out. In term of performance, a reduction in causes a decrease in the plant production capacity and SPC, while it increases the plant performance ratio (PR). On the other hand, a reduction in the inlet causes a reduction in the plant production capacity and PR and an increase in SPC for the same compressor work. Furthermore, a comparison between a MED-MVC system and a MED integrated to a thermal vapor compressor system (MED-TVC) reveals that the latter system is rather sensitive to the reduction in due to the presence of the condenser unit in the MED-TVC. The response of the MED-MVC system is slower than the MED-TVC which is due to the high thermal capacity of the preheaters for the feed in the MED-MVC.

ACS Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. Transient and thermo-economic analysis of MED-MVC desalination system. Energy 2018, 167, 283 -296.

AMA Style

Mohamed L. Elsayed, Osama Mesalhy, Ramy H. Mohammed, Louis C. Chow. Transient and thermo-economic analysis of MED-MVC desalination system. Energy. 2018; 167 ():283-296.

Chicago/Turabian Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. 2018. "Transient and thermo-economic analysis of MED-MVC desalination system." Energy 167, no. : 283-296.

Journal article
Published: 22 October 2018 in Energy
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In this study, exergy analysis of four different feed configurations of a multi-effect desalination with mechanical vapor compressor (MED-MVC) system is initially studied to identify the area of exergy destruction within system components and followed by an exergo-economic study. The feed configurations considered are forward feed (FF), backward feed (BF), parallel feed (PF) and parallel/cross feed (PCF). From the 1st law energy analysis, the PCF and FF configurations require less work to achieve equal distillate production compared to other two configurations. For instance, the specific power consumption (SPC) values are 30.1, 13.7, 23 and 13.9 kWh/m3 for the BF, FF, PF and PCF configurations, respectively. Changing the feed arrangement from BF to FF and PF to PCF at a constant compression ratio, the total fixed cost for the MED-MVC plant can be reduced by ∼30% and 17%, respectively. Second law efficiency (ηII) calculations show that the PCF (2.9%) has the highest value followed by the FF (2.7%), while the BF (2.4%) exhibits the lowest value among all configurations. The highest exergy destruction (35–50%) occurs within the MVC unit. This can be reduced by limiting the design plant operation to a lower temperature range or increasing the number of effects. Increasing the number of effects for PCF from 1 to 6 results in a 39% reduction in the SPC and a 70% increase in the second law efficiency. Operating at lower steam temperature results in an increase in the ηII, and a decrease in the SPC and total water price (TWP) of the MED-MVC system. Reducing the exergy destruction in the preheaters and the MVC unit is cost-effective for the entire system even with an increase in capital investment costs. Three different cost models are used to estimate the average TWPs for the BF, FF, PF and PCF configurations, and the TWPs are found to be 3.0, 1.7, 2.4 and 1.7 $/m3, respectively.

ACS Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. Performance modeling of MED-MVC systems: Exergy-economic analysis. Energy 2018, 166, 552 -568.

AMA Style

Mohamed L. Elsayed, Osama Mesalhy, Ramy H. Mohammed, Louis C. Chow. Performance modeling of MED-MVC systems: Exergy-economic analysis. Energy. 2018; 166 ():552-568.

Chicago/Turabian Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. 2018. "Performance modeling of MED-MVC systems: Exergy-economic analysis." Energy 166, no. : 552-568.

Journal article
Published: 01 October 2018 in Desalination
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ACS Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation. Desalination 2018, 443, 99 -109.

AMA Style

Mohamed L. Elsayed, Osama Mesalhy, Ramy H. Mohammed, Louis C. Chow. Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation. Desalination. 2018; 443 ():99-109.

Chicago/Turabian Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. 2018. "Effect of disturbances on MED-TVC plant characteristics: Dynamic modeling and simulation." Desalination 443, no. : 99-109.

Journal article
Published: 18 July 2018 in International Journal of Thermal Sciences
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In this article, a scaling analysis of heat and mass transfer processes in an adsorption packed bed is presented. New scaling parameters that characterize the performance of the adsorption cooling bed are derived and their importance are discussed. In addition, a numerical study is performed to illustrate the roles played by the newly derived scaling parameters. It is found that the presence of heat of adsorption makes the apparent heat capacity of an adsorption bed much larger than the heat capacity of the adsorbent material itself. The present results indicate that the heat diffusion and vapor penetration depths can be used to specify the desired working pair properties and the adsorbent layer thickness for producing the maximum cooling power. From the results of scaling analysis, it can be concluded that the inter-particle permeation resistance has a considerable effect on the performance of an adsorption silica gel bed when the particle diameter to adsorbent layer thickness ratio is less than 0.1. It can also be concluded that performance of a silica gel packed bed is controlled by the conductive thermal resistance when the Fourier number of the adsorbent-adsorbate layer (Fo) is less than 1.0. The convective resistance (i.e., external resistance) dominates the bed performance when the dimensionless temperature ratio (Θ) of adsorption silica gel packed bed is more than 0.2.

ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. Scaling analysis of heat and mass transfer processes in an adsorption packed bed. International Journal of Thermal Sciences 2018, 133, 82 -89.

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Louis C. Chow. Scaling analysis of heat and mass transfer processes in an adsorption packed bed. International Journal of Thermal Sciences. 2018; 133 ():82-89.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. 2018. "Scaling analysis of heat and mass transfer processes in an adsorption packed bed." International Journal of Thermal Sciences 133, no. : 82-89.

Journal article
Published: 01 June 2018 in Applied Thermal Engineering
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ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Sichao Hou; Ming Su; Louis C. Chow. Physical properties and adsorption kinetics of silica-gel/water for adsorption chillers. Applied Thermal Engineering 2018, 137, 368 -376.

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Sichao Hou, Ming Su, Louis C. Chow. Physical properties and adsorption kinetics of silica-gel/water for adsorption chillers. Applied Thermal Engineering. 2018; 137 ():368-376.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Sichao Hou; Ming Su; Louis C. Chow. 2018. "Physical properties and adsorption kinetics of silica-gel/water for adsorption chillers." Applied Thermal Engineering 137, no. : 368-376.

Journal article
Published: 01 February 2018 in International Journal of Refrigeration
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ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Ming Su; Louis C. Chow. Revisiting the adsorption equilibrium equations of silica-gel/water for adsorption cooling applications. International Journal of Refrigeration 2018, 86, 40 -47.

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Ming Su, Louis C. Chow. Revisiting the adsorption equilibrium equations of silica-gel/water for adsorption cooling applications. International Journal of Refrigeration. 2018; 86 ():40-47.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Ming Su; Louis C. Chow. 2018. "Revisiting the adsorption equilibrium equations of silica-gel/water for adsorption cooling applications." International Journal of Refrigeration 86, no. : 40-47.

Conference paper
Published: 01 January 2018 in Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC)
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ACS Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. EFFECT OF CHANGES IN INPUT PARAMETERS ON THE OPERATION OF A MED-TVC PLANT. Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC) 2018, 1 .

AMA Style

Mohamed L. Elsayed, Osama Mesalhy, Ramy H. Mohammed, Louis C. Chow. EFFECT OF CHANGES IN INPUT PARAMETERS ON THE OPERATION OF A MED-TVC PLANT. Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC). 2018; ():1.

Chicago/Turabian Style

Mohamed L. Elsayed; Osama Mesalhy; Ramy H. Mohammed; Louis C. Chow. 2018. "EFFECT OF CHANGES IN INPUT PARAMETERS ON THE OPERATION OF A MED-TVC PLANT." Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC) , no. : 1.

Conference paper
Published: 01 January 2018 in Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC)
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ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. EXPERIMENTAL AND NUMERICAL INVESTIGATION OF A NEW SILICA-GEL/WATER PACKED BED FOR ADSORPTION COOLING APPLICATIONS. Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC) 2018, 1 .

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Louis C. Chow. EXPERIMENTAL AND NUMERICAL INVESTIGATION OF A NEW SILICA-GEL/WATER PACKED BED FOR ADSORPTION COOLING APPLICATIONS. Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC). 2018; ():1.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. 2018. "EXPERIMENTAL AND NUMERICAL INVESTIGATION OF A NEW SILICA-GEL/WATER PACKED BED FOR ADSORPTION COOLING APPLICATIONS." Proceeding of 3rd Thermal and Fluids Engineering Conference (TFEC) , no. : 1.

Journal article
Published: 01 August 2017 in International Journal of Refrigeration
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ACS Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. Novel compact bed design for adsorption cooling systems: Parametric numerical study. International Journal of Refrigeration 2017, 80, 238 -251.

AMA Style

Ramy H. Mohammed, Osama Mesalhy, Mohamed L. Elsayed, Louis C. Chow. Novel compact bed design for adsorption cooling systems: Parametric numerical study. International Journal of Refrigeration. 2017; 80 ():238-251.

Chicago/Turabian Style

Ramy H. Mohammed; Osama Mesalhy; Mohamed L. Elsayed; Louis C. Chow. 2017. "Novel compact bed design for adsorption cooling systems: Parametric numerical study." International Journal of Refrigeration 80, no. : 238-251.

Journal article
Published: 28 September 2012 in Energy and Buildings
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This paper investigates experimentally and numerically airflow characteristics of vortex, round, and square ceiling diffuser and its effect on the thermal comfort in a ventilated room. Three different thermal comfort criteria namely; mean age of the air, ventilation effectiveness, and effective draft temperature have been used to predict the thermal comfort zone inside the room. Experimentally, a sub-scale room is set-up to measure the temperature field in the room. Numerically, unstructured grids have been used to discretize the numerical domain. Conservation equations are solved using FLUENT commercial flow solver. The code is validated by comparing the numerical results obtained from three different turbulence models with the available experimental data. The validation shows that the standard k–ɛ turbulence model can be used to simulate these cases successfully. After validation of the code, effect of supply air velocity on the flow and thermal field is investigated and hence the thermal comfort and energy consumption. The results show that the saved energy by vortex diffuser is 1.5 times lower than that achieved by square or round diffuser. The velocity decay coefficient is nearly same for square and round diffusers and is 2.6 times greater than that for the vortex diffuser.

ACS Style

Mohammed A. Aziz; Ibrahim A.M. Gad; El Shahat F.A. Mohammed; Ramy H. Mohammed. Experimental and numerical study of influence of air ceiling diffusers on room air flow characteristics. Energy and Buildings 2012, 55, 738 -746.

AMA Style

Mohammed A. Aziz, Ibrahim A.M. Gad, El Shahat F.A. Mohammed, Ramy H. Mohammed. Experimental and numerical study of influence of air ceiling diffusers on room air flow characteristics. Energy and Buildings. 2012; 55 ():738-746.

Chicago/Turabian Style

Mohammed A. Aziz; Ibrahim A.M. Gad; El Shahat F.A. Mohammed; Ramy H. Mohammed. 2012. "Experimental and numerical study of influence of air ceiling diffusers on room air flow characteristics." Energy and Buildings 55, no. : 738-746.