Gamal B. Abdelaziz

Suez University · Faculty of Technology and Education

Innovative and sustainable solutions are increasingly necessary as concerns about fossil fuels’ environmental and economic impacts grow. Accordingly, this study aims to enhance vehicle internal combustion engine efficiency by producing oxy-hydrogen (HHO) from drain water from the vehicle air conditioning system and utilizing it as a secondary fuel....

This study introduces an experimental investigation of a novel direct trend evaporative cooler based on a ground-air heat exchanger (GAHE) using porous clay vessels as an evaporation media under a variety of operational conditions, including air flow rate, inlet air temperature, temperature of inlet water, and in air humidity. The evaluation of the...

The present research inspected the thermal and flow behavior of finned coiled tube heat exchangers in crossflow for chilled water air conditioning systems. The investigation variables cover the impacts of several variables, such as fin dimple shape, the number of fins, and the Reynolds number of water and air sides on the thermal-hydraulic aspects...

Dried foods, especially fruits, have become a requirement of many fields in most societies not limited only to developing countries that often preserve food for periods of drought. Consequently, there has become a development in the concept of dried foods for many people, and this is reflected in the methods of producing and drying fruits, in parti...

The design and thermo-economic studies for a silica gel/water solar adsorption cooling system are presented in this paper using Simulink to perform a numerical analysis of refrigeration systems employing a pair of silica gel and water. A case study for modelling the adsorption system with several cooling load capacities ranging from 10 to 100 Ton o...

The water shortage crisis has been paid attention to and many efforts have been conducted to find proper and applicable solutions to it through developing desalination systems. Commonly, being simple in construction and easy operation, solar stills (SSs) have been developed to meet the freshwater need; especially, in arid areas. However, their prod...

This work performed the using of the metal wire mesh to enhance the SS performance. • The utilization of a wire mesh increases the absorptive surface area over the traditional absorber. • The water yield is enhanced by about 102 % by using the small size of wire mesh. • The average thermal and exergy efficiencies, and cost are about 45 %, 1.1 %, an...

Solar still is a developing solar desalination method that has been introduced to face the shortage of freshwater with low energy consumption. However, this method is challenged by its low productivity. Therefore, the following work aimed to improve the freshwater productivity and reduce the produced water price. Herein, the performance of a hemisp...

The advantage of the tubular solar still is the large receiving and condensation area that characterizes the performance of the distiller. This study aims to achieve the maximum possible benefit from this advantage by utilizing the best effective modifications to achieve the highest freshwater productivity. This was done by hybrid use of a V-corrug...

This study investigates the thermohydraulic characteristics of immiscible two-phase downward flow and heat transfer through porous media in a vertical, cylindrical, and homogeneous porous medium numerically and experimentally. The test section is exposed to a constant wall temperature after filled with spherical beads. Numerical solution of the mod...

Tubular solar still (TSS) has emerged significantly since the last decades for freshwater production especially in small communities and remote areas away from the main infrastructures. In this review, the recent developments, and the future of the various TSS designs and techniques have been discussed in detail. The study covers the parameters aff...

In this work, the thermal performance of a single slop solar still (SS) using a high-frequency ultrasound waves atomizer (HFUWA) as a humidifier was predicted through developing an artificial intelligence model. To minimize or avoid mathematical analysis or performing costly experimental work, a set of machine-learning (ML) algorithms were performe...

The present experimental study concerns to achieves the highest performance improvement of stepped solar distiller by incorporating three effective hybrid modifications on the design; CuO nanoparticles coated absorber surface, interior mirrors, and phase change materials below the steps, with the aims to improve the heat transfer rate, increase the...

The present research work aims at providing data on heat transfer by forced convection from three-dimensional bodies suspended in a free stream of air. The shapes investigated covered cubic and rectangular bodies with air flow parallel and normal to the body’s axis. The experiments were carried out inside an air duct in which air flows over a model...

The high cost of the solar tracking systems is the major obstacle facing the growth of the solar harvesting technology. Therefore, reducing the solar tracking cost is necessary for developing this important energy sector. This study developed a simple and low-cost solar tracking system for parabolic concentrator (PCST) assisting tubular solar still...

In this research, a tubular swirl-flow solar air heater (SF-SAH) with a find semi- cylindrical absorber plate is adopted to enhance its thermohydraulic performance. The proposed SF-SAH is tested with two types of fins: radial and longitudinal. Three sets of fins; 3, 4, and 5 number of fins are tested. Data obtained from the proposed SF-SAH are comp...

Water is one of the most important natural components of all life. Concerning the issue of water scarcity, desalination is a suitable solution to remove salts from salty water to increase freshwater resources. The present work experimentally analyses a Solar HDH system performance using a centrifugal humidifier at different rotating sprinkle speeds...

This paper presented the enhanced thermo-exergoenviroeconomic performance of tubular solar still (TSS) by integrating an eco-friendly, cost-effective, and available material combination. The combination was proposed to obtain thermally enhanced thin-film evaporation. On the one hand, medium-density fiberboard (MDF) carbonized wood was proposed due...

A macroscopic-scale Darcy's equation is applicable for both single-phase and multi-phase flow through classical porous materials with a porosity of 0-100% at a low Reynolds number. However, it has more than restrictions at high Reynolds number flow therefore, it cannot be applied in these conditions. The fundamental Darcy’s law assumes no inertial...

Freshwater shortage refers to the ongoing depletion of available water resources. The World Economic Forum identified this issue as the most significant global risk affecting all continents based on its potential impact over the next decade. According to the United Nations (UN) world review, up to 40% of the population will be impacted by freshwate...

The integration of solar water desalination utilizing humidification dehumidification (HDH) techniques with a cooling system (CS) and hot air flow rate was investigated experimentally during Sept and Oct. 2020 under Egypt's Suez governorate's climate located at 29.9669°N, 32.5499°E. The system performance at various air flow rates, water basin heig...

Solar distillation of saline water can be economical by combining the advantages of free-cost solar energy with effective design. A combination of two or more desalination processes is called hybrid desalination. It may provide a better cost-effective pure water yield and optimize energy consumption and pure water production. An optimum combination...

In this research, a double pass solar air heater with a corrugated absorber plate and built-in external reflector is adopted to improve its thermo-hydraulic performance. The proposed solar air heater is tested with four tilt angles: 0°, 5°, 10°, 15° and 20°. Data obtained from the proposed heater are compared with the conventional design without re...

The current work aimed to enlarge freshwater production and improve tubular solar still (TSS) performance via pure and nano-coated (with carbon black nanoparticles) mushrooms. Pure mushrooms were used due to their structure that allows effective vapor generation through achieving good solar absorptivity, capillary effect, and heat localization on t...

An experimental investigation on the solar desalination system was conducted according to humidification dehumidification methodology hybrid with hot air stream flow and vapor compression cycle as a condensation unit. A high-frequency ultrasonic atomizer (HFUA) was used as a humidifier which rapidly reaches 100% Relative Humidity. The tests were do...

In the current investigation, heat, flow characteristics, and exergy analysis of hybrid and single nanoparticles-based water passing through a triple ribbed tube heat exchanger (TRTHE) under several design and operation parameters are studied. A computational fluid dynamics (CFD) modeling is carried out using ANSYS-FLUENT 19 code while the validati...

The present study aims to obtain the best modification of the hemispherical solar distillers that achieves the highest productivity with the lower inexpensive. To achieve this goal, this paper dealt with conducting a comparative study, operating performance analysis and an economic study of two different modifications, and comparing them with the r...

The environmental pollution and growing energy demand necessitate the development of power generation using renewable energy systems, especially solar photovoltaic (PV) panels. Despite being an eco-friendly and durable power generation technology, PVs demerit for low conversion efficiency (15–20%). In other meaning, a very low amount of the inciden...

Herein, five alternative combinations were applied on and under the still basin to enhance tubular solar still performance. Firstly, using a v-corrugated aluminum basin. Secondly, adding wick material to the v-corrugated aluminum basin. Thirdly, adding carbon black (CB) nanofluid on wick material located on the v-corrugated aluminum basin (heat loc...

The Coronavirus disease (COVID-19) has spread over the world, resulting in more than 225 million patients, and 4.7 million deaths in September 2021. It also caused panic and terror, halted numerous activities, and resulted in the world economy deteriorates. It altered human behavior and compelled people to alter their lifestyles to avoid infection....

The solar desalination system is experimentally investigated according to humidification dehumidification methodology (HDH) with hot air stream flow and heat pump as a condensation unit. The effects of high frequency ultrasound atomizer number, water height and hot air stream flow rate on distillate yield are studied. The results illustrated that i...

Globally, solar photovoltaic (PV) plants have been in continuous increase, attracting researchers and governments' interest, and PV markets witness high competition. That requires advanced research and development of reliability and efficiency optimization, fault detection and diagnosis, and maintenance of various components, particularly PV module...

This research deals with an experimental investigation to manage the thermo-hydraulic performance of the heat sink with pin fin array under forced convection at various design factors and operating conditions. Experimentation tests were performed on two pin fin section shapes of a square and hexagonal with four various twist angles (0, 30, 60, and...

Two designs of rotating wick solar stills are investigated under the same operating conditions. The first design is a called L-RWSS, where the wick belt of black jute cloth is designed to be rotated inside the solar still in a path of an “L” character. The second design is called LC-RWSS, where the wick belt is designed to be rotated in a path of a...

In this work, an experimental study on energy saving for air conditioning application has been conducted. Heat Pipe Heat Exchanger (HPHX) was installed between the fresh air and return air streams to cool the fresh air before entering the air handing unit. Three test sections of wickless HPHX of different pipe diameters were tested. The studied tes...

The present study presents an enhancement in wick solar stills performance depending on using different aspect ratios with the same project area and wick materials, glass cover cooling, and external reflectors after practical knowledge of the best wick material type and dimensions. The proposed three stills (A), (B), and (C) have evaporation area d...

This study investigates the thermal-hydraulic characteristics of immiscible two-phase flow (gas/liquid) and heat transfer through porous media. This research topic is interested among others in trickle bed reactors, the reservoirs production of oil, and the science of the earth. Characteristics of two-phase concurrent flow with heat transfer throug...

This study is intended to comparative and analyze the operational performances of the conventional hemispherical solar still (CHSS), hemispherical solar still with glass cover cooling (HSS-C), and hemispherical solar still with CuO-water based nanofluid (HSS-N). To Obtain the best modifications that achieve the highest productivity with the lower i...

In this study, an experimental investigation is carried out to assess solar still (SS) performance with a porous absorber made from activated carbon tubes (RACT) with four various arrangements based on energy, exergy, economic, environmental, exergoeconomic (EXC), enviroeconomic (ENC), exergoenvironmental (EXE), and exergoenviroeconomic (EEC) point...

In this study, accurate and convenient prediction models of tubular solar still performance, expressed as hourly production, were developed by utilizing machine learning. Based on experimental data recorded in Egypt climate, three models were generated and compared; namely: classical artificial neural network, random forest, and traditional multili...

Presented is a new generation prediction model of a tubular solar still (TSS) productivity utilizing two machine learning (ML) techniques, namely:Random forest (RF) and Artificial neural network (ANN). Prediction models were conducted based on experimental data recorded under Egyptian climate. Meteorological and operational thermal parameters were...

In this paper, an experimental study is performed to investigate the influence of utilizing high frequency ultrasound atomizer (HFU) on augmenting the performance of a solar still (SS). Atomized saline water has been utilized as a motivator to enhance the humidification process inside the SS cavity. Due to the negative influence of fogging on heat...

The energy and exergy of low-global warming potential (GWP) refrigerants were investigated experimentally and theoretically. Refrigerants with a modest GWP100 of ≤ 150 can be sufficient for bringing down emissions which were concerned for the automotive air-conditioning system. Three types of low-GWP refrigerants, R152a, R1234yf, and R1234ze(E), we...

In this study, the thermal performance of the solar still was aimed to be improved in successive stages. This improvement was achieved via using a rotating drum inside the basin still to be nominated as drum distiller. The drum helps to increase the evaporative surface area and decrease the thickness of the saline water film. In the next stage of e...

This work majorly concentrates on the effect of mass flow rate of water (mfw) and Phase Change Material (PCM) in an Inclined Panel Basin Solar Still (IPBSS).To assess the performance of the proposed technique experiments were carried out using the constant mass of PCM beneath the basin of the IPBSS and mfw is varied on the panel surface. Results sh...

The work evaluates experimentally technique to improve fresh water production by careful energy recovery in the vapour condensation processes; the recovered heat in turn on drives additional evaporation and preheats the feedwater. A pilot plant is designed and constructed in an arid area with 2 m² solar evaporation collector area to evaluate the pr...

Recently, tubular solar still (TSS) is considered as one of the preferable options for pure acquisition water, particularly, for small applications located in coastal and arid regions. Such areas are usually doesn't have a sufficient power source for water desalination or infrastructure to transport pure water. This paper presents an improvement in...

This paper presents an experimental approach of a new hybrid system of modified pyramid solar still combined with evacuated tubes and nanofluids for high thermal performance. The current work compares between the performance and costs of three different units; one reference conventional solar still (CSS) and a couple of pyramid solar stills namely:...

Abstract In the present paper, comparative study of solar still with internal reflector and composite black gravel-phase change material for thermal heat storage (THS) was presented experimentally. Two operating modes were prepared with different THS; composite material (SS-CM) and PCM (SS-PCM). The experimental model was tested in the climatic co...

In the present paper, comparative study of solar still with internal reflector and composite black gravel-phase change material for thermal heat storage (THS) was presented experimentally. Two operating modes were prepared with different THS; composite material (SS-CM) and PCM (SS-PCM). The experimental model was tested in the climatic conditions o...

A design for a desalination unit using spray evaporation at atmospheric pressure and low temperature is investigated. The evaporation chamber is introduced inside the condensing chamber. An electric heater, heated the brackish water. The experimental setup is used to study the effect of temperature and mass flow rate of heating brackish water, and...

A modified pyramid solar still with both v-corrugated absorbers plate and PCM, and the conventional pyramid solar still was designed, constructed and fabricated under the same ambient conditions of Tanta city, Egypt. The performance of the modified pyramid still with both v-corrugated absorbers plate and PCM (modified pyramid still with PCM) are co...

Experimental investigations of heat transfer characteristics and performance enhancement of shell and helical coil water coolers using external radial fins and different shells diameters were conducted. The study aims to enhance the water coolers performance in a trial to improve coil compactness. Two helical coils; one with a plain tube and the ot...

Abstract Copper as well as copper base composites reinforced with coated and uncoated 1 wt% diamond, graphite particles or short carbon fibers are prepared by powder metallurgy process. The reinforcement particles were encapsulated with silver as well as copper layer by using the electroless deposition technique to investigate the influence of the...

In the present study, the thermal performance and pressure drop characteristics of wet air-conditioning cooling coils are investigated under the hot arid climate of Cairo. The effect of fin patterns, fin pitch, and air velocity on the heat transfer performance of direct expansion cooling coils is presented. Five test specimens of cooling coils are...

This paper evaluates a one-stage technique to improve fresh water production from salty water by enhancing the evaporation and condensation. A pilot plant is designed and constructed in an arid area with 1 m2 solar water collector area to evaluate the one-stage process. The effect of main parameters on fresh water production of the unit is studied....

A modified design for a desalination unit using flash evaporation at atmospheric pressure and low temperature is investigated. The evaporation chamber is introduced inside the condensing chamber. An electric heater is used for heating the brackish water. The experimental setup is used to study the effect of temperature and mass flow rate of heating...

A modified design for a desalination unit using flash evaporation at atmospheric pressure and low temperature is investigated. The evaporation chamber is introduced inside the condensing chamber. An electric heater is used for heating the brackish water. The experimental setup is used to study the effect of temperature and mass flow rate of heating...

This study is concerned with mixed convection heat transfer through porous media; involved (among others) in geothermal energy technology, high performance insulation for building, cold storage, and energy efficient drying processes. Mixed convection in a vertical porous rectangular channel is studied numerically. The study is based upon the extend...

Experimental study was carried out for the steady laminar natural convection of air in an inclined annulus porous medium, with constant heat flux heated timer cylinder and an isothermally cooled outer cylinder. The primary Objective of the study is to show the effect of porosity of the annulus on the local and maximum temperatures of the heated inn...

Experimental study was carried out for the steady laminar natural convection of air in an inclined annular porous medium with constant heat flux heated inner cylinder and an isothermally cooled outer cylinder. The primary objective of the study is to show the effect of the inclination angle of the annulus and the porosity on the heat transfer chara...

Experimental study was carried out for the steady laminar natural convection of air in an inclined annulus porous medium, with constant heat flux heated inner cylinder and an isothermally cooled outer cylinder. The primary objective of the study is to show the effect of the inclination angle of the annulus on the local and maximum temperatures of t...