
M. A. TawfikZagazig University · Department of Agricultural Engineering
M. A. Tawfik
Professor
Professor of Biosystems Engineering & Energy
-The Head of The Agricultural Engineering Department- Zagazig University
About
60
Publications
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Introduction
Publications
Publications (60)
To fulfil the sustainable development goals (SDGs) of the United Nations, the solar cooker is one of the key devices. The objective of this work is to propose a new design of solar cooker equipped with internal reflectors and a tracking-type bottom parabolic reflector (TBPR) which may help in attainment of SDGs. The performance of cooker is determi...
Integrating thermal energy storage (TES) for solar systems is crucial for better performance. To ensure the completion of solar cooking activity under fluctuating solar irradiance and reduce the subsequent loss, the integration of thermal storage to a solar cooker can play a vital role. Thus, this paper reveals the thermal performance of a
solar co...
The objective of the present study is to construct a cheap, new design of small-scale
solar parabolic dish desalination system made from reused local recyclable materials
without complex parts and power source with advantageous approach due to its
unique configuration. The desalting system including a new design of cleanable vessel
acts as a boiler...
This work proposes a mathematical model and its validation for a solar cooker (SC) augmented with a tracking-type bottom parabolic reflector (TBPR) to evaluate its thermal behaviour in two configurations, without and with TBPR (denoted as SC1 and SC2, respectively). Energy, exergy, economic, and environmental (4E) analyses were performed to verify...
It is known that the natural convection (NC) solar drying process is a simple and cheap method for drying foodstuffs, but it is not preferable for common users in the case of drying high-moisture content agro-products due to the slow rate of drying. Meanwhile, the forced convection (FC) drying process is most appropriate for such products, but its...
This study focuses on concentrating solar cookers, especially dish-type solar cookers, the theory of their different designs, including fabricating material characteristics of their essential elements, in-depth thermodynamic assessment, the significance of heat transfer fluids, and phase change materials to find out the optimum configuration, and t...
To overcome low carbon/nitrogen (C/N) ratio, recalcitrant nature, and enhancement methane production of corn stover, it was co-digested with quail manure along with alkaline pretreatment using NaOH. The best-case scenario was attained when a mixture of 50/50 with 2.5% NaOH pretreated corn stover was employed. As compared to control (mono-digested/u...
The special issue, VSI: DRES is devoted to publish research articles reporting the innovative designs and design interventions in solar thermal and bio-energy for decentralized energy systems (DES). It includes i) new and novel designs of prototype or commercial devices and technologies, their development, modelling and simulations and experimental...
In the background of the COVID 2019 pandemic, the importance of developing realistic and efficient decentralized energy solutions is one of the essential requirements. This paper presents the performance of a small-scale solar box cooker cum dryer (SBCD) for decentralized communities and domestic scale applications. The drying process in SBCD uses...
Currently, monoglycerides (MG) are produced using a complicated energy-intensive technology that contributes negatively toward greenhouse gas mitigation. This work suggests a cleaner and simpler one-step enzymatic production of α-monolaurin in an inert membrane reactor, where the reaction and enzyme separation are conducted simultaneously in one un...
This paper aims to report the building-integrated innovative non-imaging solar thermal collector (BISTC) for cooking, which is constructed and tested under field conditions in two configurations. A ray tracing analysis enables an understanding of the optics of the BISTC. The results show that BISTC attained a temperature in the range of 110–124 ◦C...
The present study proposes a new design of mechanical filter to suit the recirculating aquaculture system (RAS) as a high-efficiency alternative filter to the conventional swirl separator (CSS). The new filter is considered the developed version of CSS; thus, it is called thereafter as the swirl-vertical drum filter (SVDF) which is provided with a...
The banana peduncle was used as a substrate for the production of bioethanol using Trichoderma reesei MTCC 4876 and Kluveromyces marxianus MTCC 1389 by separate saccharification and fermentation. The banana peduncle was pre-treated by co-pretreatment method using different hydrolytic processes such as acidic and thermo-chemical methods as well as a...
This article presents the performance of a low-cost, simple and sustainable natural convection greenhouse dryer (NCGHD) for vermicelli drying. Vermicelli samples of diameter (ø) 1.25, 2 and 3 mm have been dried until no moisture evaporation was observed. The values of convective and evaporative heat transfer coefficients for ø3 mm vermicelli sample...
Drought and soil erosion are the major natural hazards cause of land degradation in the arid and semi-arid regions. North-Western Coast Region (NCR) of Egypt as arid region suffers from aridity condition most of year that characteries sporadic, low average annual rainfall except high rainfall events and its intensities in the winter season that may...
North Western Coast of Egypt as a semi-arid region suffers from lack of rainfall most of the year except during rainfall events during the winter season which may even culminate with flash floods that causes acceleration of soil erosion and water losses resulting in degradation of the cultivation lands and consequently the agri-food productivity. T...
Solar water heating is one of the established technologies with several designs. However, the use of deep parabolic dishes for continuous water heating is limited. This paper explores the use of a stand-alone manually tracked parabolic dish solar water geyser (PDSG) to generate hot water in domestic and small commercial places instantaneously. For...
The target of the biomass co-pyrolysis is improving the heating value of the produced bio-products of a certain type of feedstock, besides disposal of more than one residue in the same time. Thus, this work aims to operate a local fabricated fixed-bed pyrolyzer to improve the pyrolytic gas yield produced by the ground pieces of three biomass residu...
The enhancement in methane production under cold climates is one of the essential prerequisites to enable year-round performance improvement of any biogas plant. In Egypt, the winter is reasonably cold which offers a good opportunity to study the enhancement in the methane yield and corresponding performance improvement
of a family-scale biogas dig...
This work aims to report a novel design of feed pellets vertical cooler named as double bed vertical cooler (DBVC). The proposed DBVC is assessed experimentally using sinking fish feed pellets produced by a ring-die pelletizer under different operating parameters including the position air double vacuum fans, height of the feed pellets as a functio...
The biomass slow pyrolysis using the fixed-bed pyrolyzer is a simple and inexpensive technique that can be used in small farms comparing to the complex and expensive technology of the fast pyrolysis. However, slow pyrolysis primary produces bio-char and lower yields of bio-oil and pyrolytic gas. Thus, there is urgent need to enhance pyrolytic gas p...
The present work is aimed to report a new design of a solar cooker named as Quonset solar cooker (QSC). The cooker provided with transparent, lightweight and durable dome-shape polymeric glaze. The cooker enclosure is divided into dual cooking compartments with internal reflectors. The thermal performance of the cooker is assessed experimentally fo...
The main goal of this work is evaluating the performance of two solar desalination systems under active mode using an integrated solar flat plate collector (FPC). The first one included a glass covered pyramid solar still (PSS) combined with FPC, whilst the second is consists of a
greenhouse solar still (GSS) with the same area of brine basin and p...
In the present study, the energy, exergy, economic and environmental (4E) analyses were performed on basis of a previous experimental study on Pyramid Solar Still (PSS) incorporated with a novel air-cooled glass system. This study is an attempt to obtain deep insights into the effect of the air-cooled glass cover with PSS on the efficacy of energy...
Schematic Diagram of The Integration System of The Heated Biogas Digester using Shallow Solar Pond in Winter Season For Enhancing The Digestion Temperature From Psychrophilic range To Mesophilic range to improve the Biogas and Methane Yield.
This paper focuses on modeling the performance of a small-scale combined heat and power (CHP) plant fueled with corn
stover pieces (CSP) as very potential biomass resource in Egypt. The developed power plant can be used to satisfy the heat
and electricity needs. The proposed power plant performance is simulated using the professional Cycle-Tempo® s...
Common carp is difficult for hatching naturally in the aquaculture ponds due to the deterioration occurred with the natural hatching under environmental conditions, whereas the fry production is less than artificial incubation.So, this study aims to utilize the artificial hatching process to obtain high fertilization and fry production by using two...
This work presents structure development for a family-scale floating dome anaerobic digester for producing biogas represents in using pre-constructed concrete digestion chamber instead of the conventional digester in attempt to reduce the time and costs of construction. Also, the digestion performance of the developed digester was evaluated during...
In this study, an ammonia-water absorption refrigerator (AWAR) with 50 L in capacity was operated by solar energy captured by two systems for conducting tomatoes pre-cooling process particularly in hot weather. The first system was a solar photovoltaic-thermal system which consisted of flat plate solar collector combined with the photovoltaic (PV)...
Cooling the glass cover is considered one of the most effective modifications that affecting the performance of any solar still, particularly at summer season. Many previous studies focused on the water cooling glass cover, but it is important to study another cooling technique to avoid using potable or saline water in this process. Thus, this stud...
The oversize wood chips are existing in the conventional disc chipper production even with tuning the chipper settings which is not convenient to be used in the some applications that need to small sizes chips as biomass pellets or poultry litter for instances, hence there is an urgent need to produce mini-chips (MCHIPS) to become abundant for wide...
In northern Egypt, the ambient temperature almost below 20°C during winter months, which is insufficient for the anaerobic digestion (AD) and affecting negatively the biogas yield, especially for the floating dome digester (Indian model) due to the heat losses through the gas holder. Since the slurry temperature is a crucial factor for the AD...
Thermochemical conversion process by the gasification to convert the agricultural residues to gaseous fuel using the biomass partial oxidization theory is a very potential as a simple, clean and sustainable method for producing heat and power at rural and remote regions with less contamination compared to the fossil fuel. The biomass gasification p...
Egyptian farms produce annually about 43.640 Mega ton of the agricultural residues. 16 Mega ton from these residues has been utilized and about 27.64 Mega ton (63.34%) of the total agricultural wastes would be remain as a type of contamination. Hence, there is an urgent need to exploit these wastes especially the rice straw as priceless residue for...
This study was carried out during the season of 2014 at the Central Laboratory of Aquaculture Research,Abbassa, Abu-HammadDistrict, Sharkia Governorate, Egypt, to evaluate effect of different aeration systems namely air stone, shower, vinture and agitation systems on Nile tilapia fingerlings (O. niloticus) growth performance and water quality. Thes...
The overall goal of the present study is evaluating the performance of extrusion machine to produce a strong and durable cattle feed pellets with minimum cost using a partial replacement of rice straw in the standard cattle ration (control). Some operating parameters affecting the performance of machine were evaluated under different feeding rates...
The practical experiments were carried out to manufacture, and evaluate the performance of locally manufactured bakery milling machine to reuse the bakeries residues for snacks production. The machine performance was evaluated under three different milling drum speeds 3000, 2500, and 2000 rpm, corresponding to peripheral speeds of 10.47, 13.90 and...
The main objective of the present study is investigating the influence of the tapered screw hardening treatment and screw operating hours on the abrasive wear at three different zones of feeding (A), crushing (B) and pressing(C) on the screw as well as the expeller performance during the oil expression process for determining the optimum time for t...
Anaerobic digestion (AD) become a crucial method for obtaining a green energy that represented in biogas from organic wastes particularly the animal wastes in rural areas instead of its incineration. This study aims to investigate the biogas yield of a constructed Indian type biogas unit with an approximately volume of 3m3 at Faculty of Agriculture...
This work aims to study the availability of absorbing, trapping and exploiting the high radiation- as heat energy- in Egypt. Therefore, a set of practical experiments were conducted to evaluate both the thermal performance of an experimental salinity gradient solar pond (SGSP) and the heat extraction by using an internal heat exchanger (IHE). All e...
A small size one-row prototype machine for digging potato was fabricated locally to be simple in design, low fabrication costs, ease to operate for digging, cleaning potato tubers in small holdings under sandy soil conditions. The practical experiments of this study were carried out to evaluate the performance of the machine under four forward spee...
The aim of this study was to evaluate some engineering and operational factors affecting the performance of an indented cylinder separator on the basis of grain length for local varieties of two main grain crops in Egypt, wheat (Gimeza 7) and corn (hybrid- 310).The evaluation was identified at various cylinder speeds of 30, 35, 40 and 45 rpm. corre...
A solar drying system was constructed and tested to dry rough rice grains for seeding under Zagazig city prevailing weather conditions. The system consists of two integrated units, a solar collector with total area of 1.8 m 2 attached to a drying chamber. The system is classified as a natural convection indirect passive cabinet type without any mov...
The overall goal of the present study is evaluating the performance of a local made flat-die pelleting machine to produce a strong and durable aquatic pelleted feeds with minimum cost. Some operating parameters affecting the performance of machine and pellets quality were studied. The flat-die pelleting machine was evaluated under two values of rea...
In present study, three feed blends containing 30% protein with an energy content of 350 Kcal/100 grams were formulated with three levels of poultry by-product meal (PBM) of 0.0, 50 and 100% as a cheaper protein source instead of Herring fish meal (HFM) along with appropriate levels of soybean meal, corn flour, vitamin mix and mineral mix and pelle...
The experiments of this study were carried out during the agricultural seasons of 2007/2008 and 2008/2009 at a private mill for milling grains in Abou Kbeer district, Sharkia Governorate to optimize some operating parameters affecting the performance of hammer mill prototype. The performance of hammer mill was evaluated under different parameters i...
The present study aimed to determine and recognize a database of
physical and engineering properties of grains of some main and popular
feed, industrial crops which play an important role in designing and
developing of specific machines and their operations such as planting,
harvesting and grading .The studied crops namely fennel flower, rice
(Giza...
Soil, especially in reclaimed areas, need fertilizing application to rich it
with all plants requirement of nutrient elements, but due to the
consequent increase of commercial fertilizer prices and the desire to
prevent the environmental contamination by the excessive application
rates, the best management practices of fertilizer broadcasting machi...
Manure fertilizing machine was developed by constructing and connecting to the back of conventional machine to broadcast both manure and chemical fertilizers. This development was performed on the basis of laboratory experiments results. Laboratory experiments were carried out to optimize some operating parameters affecting the uniformity of the fe...