Browsing by Author "21905796-8864-4c32-a5f2-b0a7e4a19a63"
Now showing items 1-20 of 21
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Analysis of a hydrogen fuel cell-PV power system for small UAV
Gadalla, Mohamed; Zafar, Sayem (Elsevier, 2016-04-27)This paper investigates the integration of a hybrid power system for a small unmanned aerial vehicle (UAV). The proposed hybrid power system consists of hydrogen fuel cell, photovoltaic panels and battery. The UAV is modeled ... -
Analysis of Maisotsenko open gas turbine power cycle with a detailed air saturator model
Saghafifar, Mohammad; Gadalla, Mohamed (Elsevier, 2015-07)With ever increasing cost of fossil fuels and natural gas, the improvement in gas turbine power cycle efficiency is needed due to the tremendous savings in fuel consumption. Water/steam injection is considered as one of ... -
Assessment of solar electricity production in the United Arab Emirates
Poullikkas, Andreas; Gadalla, Mohamed (2013)In this work the possible large-scale integration of photovoltaic (PV) systems and parabolic trough concentrated solar power (CSP) technologies in the United Arab Emirates (UAE) power system is investigated in technical, ... -
Development of a Flexible Framework Multi-Design Optimization Scheme for a Hand Launched Fuel Cell-Powered UAV
Al Rayes, Zaid; Gadalla, Mohamed (MDPI, 2021)This paper presents different methods for the design of a hand-launchable, fixed wing, fuel cell-powered unmanned aerial vehicle (UAV) to maximize flight endurance during steady level flight missions. The proposed design ... -
Economics of hydrogen production and liquefaction by geothermal energy
Yilmaz, Ceyhun; Kanoglu, Mehmet; Bolatturk, Ali; Gadalla, Mohamed (2012-01)Seven models are considered for the production and liquefaction of hydrogen by geothermal energy. In these models, we use electrolysis and high-temperature steam electrolysis processes for hydrogen production, a binary ... -
An Experimental Investigation of a Cold Thermal Energy Storage System
Ahmed, Saad; Gadalla, Mohamed (2013-02)This research work investigates the heat transfer characteristics of a direct contact heat exchanger. A cold two phase refrigerant R134a is injected into water stored in an evaporator to exchange directly heat with the ... -
Innovative inlet air cooling technology for gas turbine power plants using integrated solid desiccant and Maisotsenko cooler
Saghafifar, Mohammad; Gadalla, Mohamed (Elsevier, 2015-07)Gas turbine thermal efficiency has significant dependency on climatic conditions. Evaporative cooling is commonly utilized as an inlet air cooling technique in hot and dry climates though an increase in atmospheric humidity ... -
Performance analysis and evaluation of a triple-effect ammonia-water absorption-refrigeration system
Ratlamwala, Tahir Abdul Hussain; Dincer, I.; Gadalla, Mohamed (Wiley, 2013-01)In this paper, a comprehensive thermodynamic analysis of the triple-effect absorption-refrigeration system using ammonia-water solution is carried out in order to investigate the effect of different operating conditions ... -
Performance analysis of a new designed PEM fuel cell
Ratlamwala, Tahir Abdul Hussain; El-Sinawi, Ameen; Gadalla, Mohamed; Aidan, A. (Wiley, 2012-09)In this paper, a new design for the flow channels is presented, and a parametric study of the proton exchange membrane (PEM) fuel cell is conducted in order to investigate the effect of the new flow channels, as well as ... -
Performance assessment and transient optimization of air precooling in multi-stage solid desiccant air conditioning systems
Gadalla, Mohamed; Saghafifar, Mohammad (Elsevier, 2016-07-01)Renewable energy is one of the most promising solutions to both energy and global warming crisis. Energy consumption can be minimized considerably by utilizing solar energy in air conditioning systems operation. One of the ... -
Performance Assessment of a Liquid-Phase-Separation Refrigeration Cycle
Darwish, Naif A.; Gadalla, Mohamed (Wiley, 2012-10)Absorption refrigeration cycles are alternatives to conventional vapor-compression cycles in which the energy required for refrigeration is provided by heat instead of mechanical work. In this paper, a novel refrigeration ... -
Performance assessment of an integrated absorption cooling-hydrogen liquefaction system using geothermal energy
Gadalla, Mohamed; Ratlamwala, Tahir Abdul Hussain; Dincer, Ibrahim; Kanoglu, Mehmet (2013)An integrated geothermal based triple effect absorption cooling and Linde-Hampson system for hydrogen gas liquefaction is proposed and analysed thermodynamically. The effect of various operating conditions and parameters ... -
Performance assessment of an integrated PV/T and triple effect cooling system for hydrogen and cooling production
Ratlamwala, Tahir Abdul Hussain; Gadalla, Mohamed; Dincer, Ibrahim (2011-08)In this paper we study an integrated PV/T absorption system for cooling and hydrogen production based on U.A.E weather data. Effect of average solar radiation for different months, operating time of the electrolyzer, air ... -
Performance characteristics of an ammonia-water absorption heat pump system
Gadalla, Mohamed; Talaat A., Ibrahim; Hassan, Mohammed A.M (2013-11)The influences of the performance parameters and the heat transfer characteristics of the absorption heat pump using ammonia-water mixture are theoretically carried out. There is a pronounced effect of the ammonia concentration ... -
Performance Evaluation of a Thermal Energy Storage
Gadalla, Mohamed; Ahmed, Saad (2013-02)The direct contact heat transfer technique gives better heat transfer rates. In this paper, the operation of a simple system was simulated under different operating conditions. During the charging mode of the operation, ... -
Thermo-economic analysis of an integrated solar power generation system using nanofluids
Alashkar, Adnan; Gadalla, Mohamed (Elsevier, 2017-04-01)In this paper, a thermo-economic analysis of an Integrated Solar Regenerative Rankine Cycle (ISRRC) is performed. The ISRRC consists of a nanofluid-based Parabolic Trough Solar Collector (PTSC), and a Thermal Energy Storage ... -
Thermo-economic and comparative analyses of two recently proposed optimization approaches for circular heliostat fields: Campo radial-staggered and biomimetic spiral
Gadalla, Mohamed; Saghafifar, Mohammad (Elsevier, 2016-10-15)In this paper, comparative analyses between two newly proposed circular heliostat field layout designs, i.e. Campo radial-staggered and biomimetic spiral layouts are carried out. Moreover, different optimization objectives ... -
Thermodynamic analyses of an integrated PEMFC-TEARS-geothermal system for sustainable buildings
Ratlamwala, Tahir Abdul Hussain; Gadalla, Mohamed; Dincer, Ibrahim (2012-01)In this paper we undertake a comprehensive study to meet the building heating/cooling and power demand through a sustainable operation. We integrated polymer electrolyte membrane fuel cell (PEMFC) system and triple effect ... -
Thermodynamic analysis of a new renewable energy based hybrid system for hydrogen liquefaction
Ratlamwala, Tahir Abdul Hussain; Dincer, Ibrahim; Gadalla, Mohamed; Kanoglu, Mehmet (2012-12)In this paper, a parametric study of the triple effect absorption cooling system (TEACS) integrated with solar photo-voltaic/thermal (PV/T), geothermal, and Linde–Hampson cycle is conducted. The effect of different operating ... -
Thermodynamic analysis of a novel integrated geothermal based power generation-quadruple effect absorption cooling-hydrogen liquefaction system
Ratlamwala, Tahir Abdul Hussain; Dincer, Ibrahim; Gadalla, Mohamed (2012-04)In this paper, we propose a novel integrated geothermal absorption system for hydrogen liquefaction, power and cooling productions. The effect of geothermal, ambient temperature and concentration of ammonia-water vapor on ...