Ramy Emara | Agriculture Research Center, Egypt (original) (raw)

Papers by Ramy Emara

Case Studies in Thermal Engineering, 2021

Journal of Soil Sciences and Agricultural Engineering, 2010

Special Issues for 5th International Conference for Agriculture and Bio-Engineering "The Role of Agricultural and Biological Engineering for Advancement of The Agricultural Sector", Agricultural Engineering Research Institute (AEnRI), 26-27 September, 2017, Giza, Egypt,, 2017

Solar photovoltaic (PV) systems have shown their potentiality in its usage rural projects around ... more Solar photovoltaic (PV) systems have shown their potentiality in its usage rural projects around the world. With decreasing continual prices of PV systems, it becomes economically attractive and growing experience gained with the use of PV in the agriculture activities, in turn obtaining a significant impact on rural development. The current work aims to study the performance of PV system [power output, (Poutput), and conversion efficiency, (PV)] to operate a developed standalone an electric solar tractor under two tilt angles of PV panel (0 and 30º). Also, control circuits of brush DC motor based on pulse width modulation (PWM) were designed, manufactured and evaluated. The designed system allows controlling speed of the DC motor in both of forward and reversing direction. The obtained results indicated that, the daily average (Poutput) of PV reaches about 1.95 and 2.15 kWh for 0 and 30º tilt angles, respectively. While the daily average of PV is about 13.2 and 13.3 % for 0 and
30º tilt angles, respectively. These results were corresponding to daily average insolation of 788.89 and 859.33 W/m2 at daily average PV module temperature of 36.2 and 37.4ºC for 0 and 30º, respectively. The experimental setup offers many advantages such as simple structure, low cost, accurate, quite efficient, and light mass. This work is considered as a primary step for the commercial use of a solar powered electric tractor for light service in the agricultural farm.
Keywords: tilt angle; electrical vehicle; solar modules; conversion efficiency, standalone
automated tractor.

A study was carried out to test and evaluate a green house type solar dryer for drying sugar beet... more A study was carried out to test and evaluate a green house type solar dryer for drying sugar beet tops under three different levels of air velocity (0.4, 0.8, and 1.2 m/sec), three different lengths of beet tops (3, 6, 9 cm) and two different treating conditions (with crushing, and without crushing). The changes in sugar beet tops moisture content was monitored versus the drying time until reaching the proper moisture content of about (12-13 % w.b.). Solar radiation flux incident, bulk temperature of tops, air temperature and relative humidity, overall thermal efficiency of the dryer and the protein content of the dried tops were determined. The results showed that, the hourly average available solar radiations ranged from 598.26 to 663.85 W/m 2 during the experimental work. Also, the solar collector of the dryer could increase the air temperature by about 12.6, 12.31 and 12.81 o C and decrease the air relative humidity by about 26.06, 23.67 and 20.97 % for air velocity of 0.4, 0.8, and 1.2 m/sec respectively. The reduction rate in moisture content of sugar beet tops was varied and increased with the increase of drying air velocity, decrease of chopping length and for the crushed samples in comparison with the not crushed samples. Also, the constant drying rate period was not detected for all studied levels of drying air velocity, while all the drying process occurred during the falling rate-drying period. The result also show that the use of the greenhouse type solar dryer with chopping and crushing of the green tops could decrease the drying time of sugar beet tops by about 47 to 59 h in comparison with the traditional drying method which has been taken about 78 hours. The thermal efficiency of the dryer ranged from 34.12 to 22.96 % and the protein content of the dried tops ranged from 12.57 to 14.52 % on DM basis.

Case Studies in Thermal Engineering, 2021

Journal of Soil Sciences and Agricultural Engineering, 2010

Special Issues for 5th International Conference for Agriculture and Bio-Engineering "The Role of Agricultural and Biological Engineering for Advancement of The Agricultural Sector", Agricultural Engineering Research Institute (AEnRI), 26-27 September, 2017, Giza, Egypt,, 2017

Solar photovoltaic (PV) systems have shown their potentiality in its usage rural projects around ... more Solar photovoltaic (PV) systems have shown their potentiality in its usage rural projects around the world. With decreasing continual prices of PV systems, it becomes economically attractive and growing experience gained with the use of PV in the agriculture activities, in turn obtaining a significant impact on rural development. The current work aims to study the performance of PV system [power output, (Poutput), and conversion efficiency, (PV)] to operate a developed standalone an electric solar tractor under two tilt angles of PV panel (0 and 30º). Also, control circuits of brush DC motor based on pulse width modulation (PWM) were designed, manufactured and evaluated. The designed system allows controlling speed of the DC motor in both of forward and reversing direction. The obtained results indicated that, the daily average (Poutput) of PV reaches about 1.95 and 2.15 kWh for 0 and 30º tilt angles, respectively. While the daily average of PV is about 13.2 and 13.3 % for 0 and
30º tilt angles, respectively. These results were corresponding to daily average insolation of 788.89 and 859.33 W/m2 at daily average PV module temperature of 36.2 and 37.4ºC for 0 and 30º, respectively. The experimental setup offers many advantages such as simple structure, low cost, accurate, quite efficient, and light mass. This work is considered as a primary step for the commercial use of a solar powered electric tractor for light service in the agricultural farm.
Keywords: tilt angle; electrical vehicle; solar modules; conversion efficiency, standalone
automated tractor.

A study was carried out to test and evaluate a green house type solar dryer for drying sugar beet... more A study was carried out to test and evaluate a green house type solar dryer for drying sugar beet tops under three different levels of air velocity (0.4, 0.8, and 1.2 m/sec), three different lengths of beet tops (3, 6, 9 cm) and two different treating conditions (with crushing, and without crushing). The changes in sugar beet tops moisture content was monitored versus the drying time until reaching the proper moisture content of about (12-13 % w.b.). Solar radiation flux incident, bulk temperature of tops, air temperature and relative humidity, overall thermal efficiency of the dryer and the protein content of the dried tops were determined. The results showed that, the hourly average available solar radiations ranged from 598.26 to 663.85 W/m 2 during the experimental work. Also, the solar collector of the dryer could increase the air temperature by about 12.6, 12.31 and 12.81 o C and decrease the air relative humidity by about 26.06, 23.67 and 20.97 % for air velocity of 0.4, 0.8, and 1.2 m/sec respectively. The reduction rate in moisture content of sugar beet tops was varied and increased with the increase of drying air velocity, decrease of chopping length and for the crushed samples in comparison with the not crushed samples. Also, the constant drying rate period was not detected for all studied levels of drying air velocity, while all the drying process occurred during the falling rate-drying period. The result also show that the use of the greenhouse type solar dryer with chopping and crushing of the green tops could decrease the drying time of sugar beet tops by about 47 to 59 h in comparison with the traditional drying method which has been taken about 78 hours. The thermal efficiency of the dryer ranged from 34.12 to 22.96 % and the protein content of the dried tops ranged from 12.57 to 14.52 % on DM basis.