Mohamed Elmeadawy - Academia.edu (original) (raw)

Papers by Mohamed Elmeadawy

Heliyon

Reducing reliance on fossil fuels with clean and sustainable alternatives is essential for mitiga... more Reducing reliance on fossil fuels with clean and sustainable alternatives is essential for mitigating climate change and global warming-related environmental concerns. Previous researchers have studied the performance of choppers and crushers as separate units powered by diesel or gasoline engines. Nowadays, an increasing interest in producing Eco-friendly machines that stand out for being dual purposes, cost-effectiveness, and with lengths suitable for feeding ruminants are imperative to achieving economic and sustainable goals. Therefore, this study aims to solve these issues and gaps by developing and evaluating a dual-purpose forage machine for chopping and crushing operations to achieve both operations more efficiently and at a lower cost. The developed forage machine’s performance was evaluated for chopping operation using maize stalks with four different rotational speeds of 1200, 1400, 1600, and 1800 rpm and four different moisture contents of 22.7, 43.3, 59.8, and 74.6% (w.b.). Also, the crushing operation was evaluated using maize ears with four different crusher speeds of 1200, 1400, 1600, and 1800 rpm and three different sieves with holes’ diameters of 6, 8, and 10 mm. The results concluded that the highest efficiencies with values of 94.17 and 92.85% were obtained at 1800 rpm chopper rotational speed and 22.7% moisture content for the chopper and 1200 rpm crusher rotational speed and 10 mm sieve hole diameter for the crusher, respectively. At these proper operational parameters, the machine productivity of 2.44 and 0.31 ton.hr−1, the specific energy requirements of 3.22 and 4.50 kW.hr.ton−1, and the estimated production costs of 23.56 and 121.24 EGP.ton−1 (1.25 and 6.38 USD.ton–1) were obtained for chopper and crusher, respectively.

Misr Journal of Agricultural Engineering, 2018

The aim of this research was study the effect of dust deposition on solar radiation and solar pho... more The aim of this research was study the effect of dust deposition on solar radiation and solar photovoltaic panel. A theoretical calculation was done and experiments were carried out at Mariout Research Station, El-Amria-Alexandria-Desert Research Center. To study the effect of dust deposition two square plates of glass (20x20 cm) and three pyrnometers were used, the first plate (the control) was cleaned daily and the other was used to determine the solar radiation. The period of the experiment is 175 days from 14 th march to 26 th August 2017. From the experiments; the dust deposition reduces the amount of solar radiation which is falling on the solar panel and creates shadow effect. With the passage of time the density of dust on the panel increases. And this reduces the electric power of the solar panel,. From the data, there was power reduction up to 51.12 %. The efficiency of the solar photovoltaic panel system was reduced from 15.9 to 7.88 % for clean and unclean modules respectively. The total correction solar radiations for the experimental period are 37.4 and 18.28 (kW.h/m 2) for clean and unclean modules respectively. The unclean module with dust deposition, showed total output power (24.88%) less than the clean module for the period of 25 weeks.

Journal of Soil Sciences and Agricultural Engineering, 2019

A photovoltaic panel (PV) is a practical method to produce electrical energy from solar light. Th... more A photovoltaic panel (PV) is a practical method to produce electrical energy from solar light. The solar conversion efficiency of PV panels is still low, improving it wills makes great differs of PV panels used. However, the efficiency of PV panels can be improved in many ways. One of them is to connect reflectors with PV panel. So, the aim of this research is to study the effect of three types flat reflectors (Nickel Chrome reflector; NCR, Aluminum sheet reflector; ASR and reflective glass reflector, RGR) connected with both sides of PV panels at four different tilts angles (30, 45, 60 and 90 o) on the intensity of solar radiation falling per different periods of times and to determine the impact and performance of the PV panels output. Generally, the maximum daily average of solar radiation flux incident on the PV panel (from 8:00 to 17:30) was 828.93 W.h/m 2 for NCR at a reflector angle of 30 o (RA 30) and the corresponded percentage increment compared to the control panel was 24.98 %. Also, at zero shade periods (ZSP) from 10:30 to 13:30, the maximum daily average value of total power was 0.758 kW, which represents 74.61 % of the daily total power for NCR at RA 90. The highest PV panel temperature was recorded for PV panel with NCR at RA 90. The rate of increase in the power resulting from the reflectors is much greater than the amount of loss of power resulting from the rise in temperature.

Egypt has one of the best weather conditions for producing renewable energy in the world. As a re... more Egypt has one of the best weather conditions for producing renewable energy in the world. As a result, there has been a proven market pull for solar energy in the region in a growing clean energy export market as clean energy. Solar energy maintenance is relatively low comparing to other power generation sources. Although, less maintenance is required, the important factor that reduces its generation according to accumulate dust on solar PV modules. Dust accumulation effectively reduces the energy yield of solar panels. So, the current paper deals with the locally designed automatic cleaning mechanism for solar PV modules. The designed mechanism consists of an electronic solar module that automatically cleans the solar module at the required rate. without requiring water to clean the solar module. This cleaning mechanism is also suitable for pole mounted street lighting systems where daily manual cleaning is not possible and could be more costly. Six months later from start experime...

Misr Journal of Agricultural Engineering, 2020

The presented study aims to investigate the effect of using two effective irrigation techniques; ... more The presented study aims to investigate the effect of using two effective irrigation techniques; the pulse-deficit drip irrigation and the deficit irrigation powered by solar energy in a greenhouse. This work studied impact of these factors a tomato soilless productivity, water productivity and of these techniques solar energy productivity. The experimental study was carried out at Tractors and Farm Machinery Research and Test Station, Alexandria Governorate. The results showed that, the pulsed-full drip irrigation at 100% of ETc (FP100) gave the highest yield of 35.8 ton/fed., but the continuous-deficit drip irrigation at 50% of ETc (DC50) gave the lowest yield of 20.4 ton/feddan. The highest water productivity (WP) was 37.1 kg/m 3 when using the treatment of (DP50), on the other hand the Continuous-Full drip irrigation at 100% of ETc (FC100) (control treatment) represents the lowest WP of 27.9 kg/m 3. Application of pulse-deficit irrigation (DP50) saved 50% of the water irrigation requirements and decreased the total tomato yield per feddan by 34%, but the water productivity increased by 33% compared with continuous-full irrigation (FC100) as control. Treatment of pulse-deficit irrigation (DP50) saved 50% of solar energy consumption and increase energy productivity (908 kg/kWh) by 33% compared to continuous-full irrigation (FC100) as control. The results showed that pulse-deficit drip irrigation technique, decrease tomato yield but increase WP in all treatments. This study recommend apply, pulse-deficit irrigation (DP75) technique results in reducing tomato yield by 3% and increasing water and energy productivity by 29.3 and 29.4% respectively.

Journal of Soil Sciences and Agricultural Engineering, 2014

Laboratory experiment was carried out at Rice Mechanization Center (Agric. Eng. Res. Institute, M... more Laboratory experiment was carried out at Rice Mechanization Center (Agric. Eng. Res. Institute, Ministry of Agric.) in Kafr El-Sheikh to determined some of physical and engineering properties for Egyptian hybrid rice No.1 that help in develope of a suitable precision vacuum planter for sowing dry, soaking and incubated hybrid rice seeds. The rice seed (dry, soaked and incubated) properties were seed moisture content (Mc), mean dimensions {Length (L), Width (W) and Thickness (Th)}, shape index (Si), seed density (ρ), weight of 1000 seeds (Wi), sphericity (Sp), arithmetic mean diameter (Da), geometric mean diameter (Dg), repose angle (Ra), dynamic coefficient of friction (Fd) and terminal velocity (Tv). From laboratory experiments, it has been manufacturing a precision vacuum planter unit suitable for planting hybrid rice seeds in two rows with 150 mm and 150 mm spaced in the row.

Journal of Soil Sciences and Agricultural Engineering

Spraying pesticides are important to protect crops from insects consequently to obtain the highes... more Spraying pesticides are important to protect crops from insects consequently to obtain the highest production yield. The manual or battery knapsack sprayers are dominant in the Egyptian market. However, the first type depends on the operator skill and for the second type; the battery charge is not constant throughout the operating period. Therefore, the research aimed to develop a knapsack sprayer powered by solar energy that operates throughout the day at constant flow rate pressure. This was achieved by manufacturing the developed sprayer from local materials, and by providing it with a solar pump powered by a battery, the photovoltaic panel and an electronic circuit in which the spray pressure can be controlled from 0 to 4 bars. The amount of pesticide can be controlled according to the age of the plant, as well as, the uniformity of pesticide distribution identified using constant pressure throughout the spray period and thus ensuring the fairness of pesticide distribution and not relying on lobar experience. The results indicated that the number of operating hours for the developed sprayer reaches more than 8 hours per day with constant pressure compared to using the battery-powered sprayer only, which operates from 1.5 to 3 hours only with no pressure stability at a flow rate 600 to 1000 ml/min. On the economic side, the cost of spraying from the developed sprayer is 54.37 L.E/fed compared with (102.50 and 79.70 LE /fed) for manually sprayer and battery sprayer, respectively. Therefore, a developed sprayer is high economic and practical value in the agricultural sector.

Egyptian Journal of Agricultural Research, 2018

nowledge on physical properties of rice grains is an important tool for designing agricultural ma... more nowledge on physical properties of rice grains is an important tool for designing agricultural machines and other equipment to handle planting, harvesting, processing, packaging and storing. The most common rice genotypes grown in Egypt is 19 rice genotypes (12 rice cultivars and 7 promising lines) but the data on its physical properties is still lacking. The aim of this study is to investigate some engineering properties of 19 rice genotypes which grown in Egypt and setup database for rice genotypes as well as its use to design Precision agriculture machines at different seed moisture contents for various manner of direct seeded rice approaches. Laboratory experiments were carried out during 1stMay of 2016 and 2017 seasons at the Farm of Rice Research Department, Field Crops Research Institute, Kafr ElSheikh Governorate collaborated with Tractor Farm Machinery Test and Research Station Alex). The rice grains properties of (dry, soaked and incubated for 24 and 48 hours) were tested....

This paper discusses the exploration potential of extensional structures in pre-Messinian formati... more This paper discusses the exploration potential of extensional structures in pre-Messinian formations in central Nile Delta Basin. The study aims at detailed description of extensional events and discusses the exploration potential of specific structures generated. Particularly, structural elements of pre-Messianian sequences were partially deciphered in the past, due to quality of seismic data and spare and scarce wells drilled to these levels. The newly acquired high quality 3D seismic data has been able to improve the image underneath the pre-Messinian. This has resulted in the understanding of tectonic activity, faults system and structures developed. Two extensional events characterize the tectonic activity in the Late Oligocene through Messinian. First extensional event is related to onset of Gulf of Suez rifting and generate a W-E system of basement involved faults and reactivation of syn-rift hinge zone. Related structures of this extensional phase are represented by growth anticline, drag folds and rotated blocks. The second extensional tectonic event occurred in Tortonian. The structural style corresponds to tilted and eroded fault blocks dipping to north and being aligned in a north- south direction corresponding to the main normal faults trend. This study of the pre-Messinian extensional structures described here will have a direct impact on the exploration activities design, several important prospects being delineating among the structures developed during both extensional phases.