Effect of air temperature and flow rate on energy consumption and drying rate of three paddy varieties in fluidized bed dryer
Vali
Kelikanlou
M.sc graduated, Department of Mechanical Engineering of Biosystem, Faculty of Water and Soil, Gorgan University of Agricultural Sciences and Natural Resources.
author
Mohammad Hashem
Rahmati
Associate Professor/Department of Mechanical Engineering of Biosystem, Faculty of Water and Soil, Gorgan University of Agricultural Sciences and Natural Resources
author
Mohammad Reza
Alizadeh
Associate Professor, Rice Research Institute of Iran, Agricultural Research, Education and Extension Organization (AREEO), Rasht, Guilan, Iran
author
text
article
2018
per
With the development of modern drying paddy in addition to speed up the drying process, and in particular the amount of waste can be reduced to the minimum possible energy consumption. In this study was investigate the effect of input air temperature, input air flow rate and variety also their interaction on energy consumption and drying rate in the fluidized bed dryer. The parameters of input air temperature at 4 levels of 45, 50, 55 and 60 °C, the air flow rate at 3 levels of 0/12, 0/14 and 0/16 m3/s and variety of paddy at 3 levels Tarom, Fajr and Shirudi was considered and tests was done in three replication in form of a 3×3×4 the 3-factor factorial design. The results indicated that In all three varieties tested, by increasing the intake air temperature as well as reduced energy consumption, drying rate also increased significantly. At 45 and 50 ° C, increasing air flow grain drying had no significant effect on the rate But at 55 and 60 ° C by increasing the flow rate of drying significantly increased. The results showed that by increasing air flow, increased energy consumption.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
161
170
https://ijbse.ut.ac.ir/article_66804_e010dc8c72be907b7ba3cafb52b43b42.pdf
dx.doi.org/10.22059/ijbse.2017.142384.664730
Numerical simulation of changes in pressure and flow velocity of pollutant gases in a bio filter bed in animal husbandry
Mohammad
Aliashraf
Master graduate student of Mechanical Engineering of Biosystems
author
Ali
Maleki
Shahrekord University
author
Mahdi
Ghasemi Varnamkhasti
Assistant professor of Mechanical Engineering of Biosystems
author
Farzad
Mahdiye Broujeni
Master graduate student of Mechanical Engineering of Biosystems
author
text
article
2018
per
This research has focused on study of changing static and dynamic pressure and velocity values in three levels of different bio filter cross sections. The studied factors included gas flow rate, cross sectional area (trapezoidal, square and circular), vertical position (bed center line, front line and rear end) in four elevation ranges from the bottom of the bio filter bed (the first part 0 to 16.75 cm, the second part 16.75 to 29.25 cm, the third part 29.25 to 41.75 cm and the fourth part was 41.75 to 58.5 cm) was examined. The results of studying the pressure and velocity in the three cross sections showed the lowest mean of dynamic and static pressure in the square section and the mean speed was higher due to the absence of the corner at the cross section. The variations of pressure in different ranges of bio filter bed showed a decreasing trend, so that the average of dynamic pressure drop and static pressure drop in these ranges were 87.9 and 44.4%, respectively. While the maximum dynamic pressure has obtained from circle section. At the locations assumed in this study, the maximum average of dynamic pressure estimated 1.509×10-5 Pa at center line. For the other locations the average dynamic pressure obtained 2.502×10-6 Pa at front line and 2.481×10-6 Pa at back line.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
171
179
https://ijbse.ut.ac.ir/article_66805_d27ce5f939fbb09a0334ac403baaf27c.pdf
dx.doi.org/10.22059/ijbse.2017.200681.664738
Modeling the effect of different oscillation angles on the oscillatory tine performance using Discrete Element Method
naser
kanyawi
کارشناس ارشد مکانیک ماشین های کشاورزی
author
gholamhossein
shahgholi
دانشگاه محقق اردبیلی
author
text
article
2018
per
Interaction between soil and machine is essential challenge for researchers, developers, designers and manufacturers of agricultural machineries. Modeling of tillage equipment is an important Engineering work. However, interaction modeling is a complex process due to three-dimensional changes in soil, nonlinear soil behavior phenomenon and soil flow quality in connection area between the soil and tool and the dynamic effects of equipment. Correct simulation of the interaction of soil is the key point for the optimization of tillage tools and can eliminate required field tests with high costs. The purpose of this study is to develop a three-dimensional model of a vibrating subsoiler using discrete element method, simulation frequency and oscillation angle on the performance of vibration subsoiler and determining different parameters affecting the simulation results. The information from model simulation will be useful for the design and optimization of vibrating subsoiler. For modeling soil mass as a granular material, the computer program PFC3D. Blade was moved with angular and transition speed in the positive x-axis direction. For non-vibrating blade only included transition speed and for vibration blade in addition to transition speed, angular velocity was also defined. Working depth was 38 cm and blade speed of 0.89 meters per second was defined. To evaluate the effect of vibration angle on vibrating subsoiler different vibration of 27, 16, 8, zero,-14.5,-22.5 degrees in frequency of 4.9 Hz and amplitude of ± 69 amplitude was tested by simulation. In all vibration tests in comparison with non-vibrating,with Increasing vibration angle (positive and negative), the amount of vertical displacement of blade increased which caused more soil rupture. Simulation results showed that the rate of boundary work, kinetic energy and friction work at positive angles were more than negative vibration angles. With increasing negative angle boundary work and friction work significantly decreased. Changing the angle from -22.5 to 27 degrees decreased average bond energy of particles.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
181
194
https://ijbse.ut.ac.ir/article_66806_448de3b37f5a483539ecd3ee951cca6f.pdf
dx.doi.org/10.22059/ijbse.2018.216690.664853
Feasability of using electrical capacitance for determining the fruit ripeness of apple
Ali
Haiati
University of Shiraz
author
Mohamad Hosein
Raofat
University of Shiraz
author
Saadat
Kamgar
University of Shiraz
author
Firooz
Jahani
University of Shiraz
author
text
article
2018
per
Grading based on product ripeness is important for marketing fruits and vegetables. Various methods have been used to determine fruit ripeness some of which are destructive and some nondestructive. In this study for determining the fruit ripeness of apple during storage an apparatus was designed and fabricated to measure the electrical capacitance of the fruit samples as an indication of fruit ripeness. In the next stage a model was proposed to establish a relationship between the capacitance and ripeness (maturity rate) of the apple fruits. The capacitance unit was used to measure the dielectric constant of two apple varieties; Red delicious and Golden Delicious. For each variety three fruit samples of 45 mature apples were harvested on one day. Each sample was divided into three groups of small, medium and large apples. Preliminary tests indicated that the capacitance unit can establish a good relationship between dielectric constant and fruit ripeness at a frequency of 100 kHz. Remaining tests were conducted to measure dielectric constants of all samples under controlled conditions of temperature and humidity at this frequency. Analyses of the results indicated that dielectric constant decreases as the fruit ripens. This frequency level was also used to conduct other tests for measuring the fruit hardness and total soluble solids (TSS) during ripening stage. Results indicated that fruit hardness decreases and TSS increases during ripening.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
203
195
https://ijbse.ut.ac.ir/article_66809_231e18d6c8edba2125cb5d8faff4ec67.pdf
dx.doi.org/10.22059/ijbse.2018.218246.664861
Effect of tillage methods, different amount of super absorbent and residue on canola seedling emergence and yield under dryland condition
mahmoud
ghaseminezhad
Khuzestan Agricultural Sciences and Natural Resources University (KhAU)
author
yasaman
Amidi
Khuzestan Agricultural Sciences and Natural Resources University (KhAU)
author
Mohammad Amin
Asoodar
Khuzestan Agricultural Sciences and Natural Resources University (KhAU)
author
Mohammad Reza
Moradi Telavat
Khuzestan Agricultural Sciences and Natural Resources University (KhAU)
author
Bijan
Khalili Moghadam
Khuzestan Agricultural Sciences and Natural Resources University (KhAU)
author
text
article
2018
per
In order to study the effects of tillage, crop residue, and super absorbent on canola seedling emergence and yield, an experiment was conducted in Izeh region, east of Khuzestan in 2014. A strip spilt plot design was applied in form of randomized complete block using 3 replications.. The main treatments consisted of three tillage methods: conventional tillage (moldboard plow and disk) reduced tillage (combination tillage and disk) and no tillage(direct seeding). Secondary treatments were different amounts of super absorbent (0, 30, 60, and 90 kg/ha), and the third treatment was 2 levels of wheat residue (60% and 0%). Reduced tillage method with 66.25% showed the maximum seedling emergence compared to no-till treatment (7.59%). The maximum seedling emergence (68.94%) was achieved from 90 kg/ha super absorbent. Reduce tillage method with 1674 kg/ha and no-tillage with 1134 kg/ha showed the maximum and the minimum yield respectively. Finaly, the results were shown that superabsorbent and crop residues were affected in increased soil moisture content and grain yield
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
205
213
https://ijbse.ut.ac.ir/article_66823_e48f33b9195964aa9fb5420487e31df5.pdf
dx.doi.org/10.22059/ijbse.2017.225302.664895
Developing a new hybrid system for detection of apple tree leaves diseases
Zohreh
Ghasemi Varjani
Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran
author
Seyed Saeid
Mohtasebi
University of Tehran
author
Hadi
Ghasemi
Department of Civil and Environmental Engineering, Amirkabir University of Technology, Tehran, Iran
author
Elham
Omrani
Department of Agricultural Machinery Engineering, Faculty of Agricultural Engineering and Technology, University of Tehran, Karaj, Iran
author
text
article
2018
per
Each year, plant diseases cause considerable damages to the agricultural sector which their effect on the economy and food security is very important. Early detection of plant diseases is a useful strategy to reduce these losses. In recent years, researchers have used a variety of techniques such as machine vision for the diagnosis of plant diseases. In this study, a new system, consisting of digital image processing technique and also combination model of artificial neural network to distinguish three apple tree leaf diseases (namely Alternaria, apple black spot, and apple leaf miner pest) were used. In short, the process of digital image processing technique involves preparation, processing, and extraction of features of each of the sample images and the hybrid artificial neural network model was used to classify diseases. In this model, particle swarm optimization algorithm for network training (PSO) and Levenberg-Marquardt (LM) were used. After that, the operation of the proposed system for diagnosis of diseases of apple trees was evaluated. It is concluded that the system has a good performance for diagnosis accuracy was 99% and R2=0.985, RMSE=0.099. Finally, in comparison with other methods mentioned by other researchers for diagnosis of apple tree leaves diseases, the proposed system has higher ability.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
215
225
https://ijbse.ut.ac.ir/article_66824_d10d970d3e1a61a88634bee61fb12e9c.pdf
dx.doi.org/10.22059/ijbse.2017.232483.664936
Monitoring the red meat freshness by using combined dielectric spectroscopy and image processing
Amir Ali
Sadeghpour Esfahani
Master student, Dept. Biosystems Eng., Shahrekord University.
author
Mojtaba
Naderi Beldaji
Shahre Kord University
author
Mahdi
Ghasemi-Varnamkhasti
Assistant Professor, Dept. Biosystems Engineering, Shahrekord University
author
Bahram
Hosseinzadeh-Samani
Assistant Professor, Dept. Biosystems Eng., Shahrekord University
author
text
article
2018
per
Regarding the importance of quality of meat and other daily consuming food stuffs in the growth and health of human society, development of quality diagnosing and monitoring systems for food materials are being paid increasing attention by investigators. In this study, 40 beef samples were subjected to macroscopic imaging and dielectric power spectroscopy at 20 frequencies in the range of 5-100 MHz during five days of storage at 5 ° C. It was hypothesized that combination of the two sensing methods would result in more information on physicochemical changes of meat during ageing. For any beef sample, 42 attributes (i.e. 20 dielectric variables including dielectric power at different frequencies and 22 texture and color features of the image) were extracted. Classification analyses for the day of storage were performed with five algorithms of neural networks including multi-layer perceptron (MLP), multinomial logistic regression (MRL), functional trees (FT), logistic model trees (LMT) and Bagging aggregation. The results showed that the dielectric power at different frequencies decreased with the storage day from e.g. 250 µW at 5 MHz on the first day to 100 µW at the same frequency on the fifth day. The results showed that image parameters of beef were more effective in classification than dielectric variables but combining the information of the both sensory techniques, after reduction using PCA, resulted in classification accuracies of %78 for functional tree (FT) algorithm and %77 for Bagging classification with MLP as the base classifier.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
227
236
https://ijbse.ut.ac.ir/article_66825_5f819e45f1bcd8227f021efacd5d152f.pdf
dx.doi.org/10.22059/ijbse.2017.237213.664966
Agents Affecting the Mechanical Harvesting of Pistachio Nuts in Iran (Case Study of Kerman Province)
Saeed
Firouzi
Department of Agronomy, Rasht Branch, Islamic Azad University
author
Mohammad Ali
Rostami
Department of Agricultural Engineering, Kerman Agricultural and Natural Resources Research and Education Center
author
Mohammad Javad
Ramezani
Department of Agronomy, Rasht Branch, Islamic Azad University
author
Amir Hossein
Bazyar
Sama Technical and Vocational training College, Islamic Azad University, Rasht Branch, Rasht, Iran
author
text
article
2018
per
Iran is the world's largest pistachio producer and exporter. Hence, the sustainability of the production of this strategic product is of particular importance. The high cost of pistachio harvesting has reduced the income of pistachio growers and created a serious challenge to the motivation of producing the pistachios. So, in this research, the contributing factors of mechanical harvesting of pistachio nuts in Kerman Province as the pole of pistachio production in Iran were studied. For this purpose, the Delphi method was used in three stages. Accordingly, 25 experts of pistachio cultivation experts and big growers of Rafsanjan and Kerman cities were considered as the research panel of the study. The final results of the research showed that the factors "Improving water use efficiency by supporting the implementation of new methods for irrigation of pistachio trees" and "allocating suitable credits for the pistachio nuts harvesting" with 96.00% and 95.00% agreements of the research panel’s members were the first and second stimulants for the development of pistachio harvesting in Kerman Province. Also, the factors of "implementation of pattern projects for mechanized pistachio harvesting", and "Providing incentive policies for the development of mechanical harvesting among the pistachio growers" with 91.00% of the agreement, jointly ranked as the second priorities. Investigating the barriers to the mechanical harvesting of pistachio also showed that the factors of the "smallness of most pistachio gardens" and "not being single-base or single-nesting of pistachio trees in the region" with the 97.00% and 94.00% agreements got the first and second ranks, respectively. Therefore, special financial supports for implementation of efficient irrigation systems, modification and renovation of old gardens, and the establishments of pattern projects for mechanized pistachio harvesting are inevitable. Also, consolidation of small pistachio gardens in the form of agricultural cooperatives in order to increase the group's financial strength as a backbone for the modifying the old gardens and the provision of pistachio harvesting equipments are indispensable.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
237
248
https://ijbse.ut.ac.ir/article_66827_3df430e5b69a70851d05a1d73a4fd1c9.pdf
dx.doi.org/10.22059/ijbse.2018.237546.664968
Assessment and modeling of energy flow and environmental impacts of cookie production by life cycle assessment approach
Majid
Khanali
University of Tehran
author
Asadollah
Akram
Faculty of Tehran University
author
Mahdieh
Mohammadnia Galeshklamei
Department of Agricultural Engineering, Faculty of Engineering and Technology, College of Agriculture and Natural Resources, Tehran University
author
homa
hosseinzadeh-bandbafha
Department of Agricultural Machinery, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, Tehran University
author
text
article
2018
per
In this study, energy consumption and environmental emissions of cookie production in Guilan Province of Iran was investigated. The required information was collected using questionnaires and interviews from 30 factories of cookie production. Equivalent energies of inputs and outputs were calculated based on the standardized energy coefficients. The results of this study showed that 30.50 MJ of energy was consumed for production of one kilogram of cookie in which the highest share of energy consumption was allocated to natural gas with 17.09 MJ kg-1. Based on life cycle assessment (LCA) results, global warming (GW) index was calculated as 3.73 kg CO2 eq. per kilogram of produced cookie which about 51 percent of that was related to combustion of natural gas consumed in cooking process. Finally, the modeling of amount of yield and environmental impacts was conducted based on two models of artificial neural network (ANN) and adaptive neuro-fuzzy inference system (ANFIS). The results showed that ANFIS was capable of predicting yield with more accuracy and less error.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
249
259
https://ijbse.ut.ac.ir/article_66828_572e5061d3ffb077f460cb7cd6dbf98e.pdf
dx.doi.org/10.22059/ijbse.2017.238331.664969
Technical feasibility of using infrared radiation in dry-peeling for hazelnuts
Ali
Mashallah kermani
Abureyhan Campus
author
Shahriar
Kouravand
Department of Agro-Technology Engineering, College of Aburaihan, University of Tehran, Tehran, Iran
author
Jalal
Eskandari
2Master of Science student, Department of Agro-Technology Engineering, College of Aburaihan, University of Tehran, Tehran
author
text
article
2018
per
In this study, removal of the brown skin (seed coat) on the hazelnut kernel was investigated using infrared radiation. Evaluation of the infrared radiation method to achieve the highest percentage of seed coat loosening on the kernel. The effects of infrared emitter power at three levels of 800, 1200 and 1600 W, radiation duration at three levels of 2, 3 and 4 minutes, and the initial moisture content of hazelnuts at four levels of 4, 6, 8, and 10% wet basis (w.b.) were investigated. Experiments were conducted at factorial in a completely randomized design with three replications. The peel loosening percentage was determined with using image processing method The results showed that by increasing in the IR radiation power and radiation time increased the percentage skin loosening significantly (p < 0.05), while the increase of moisture content hazelnuts was caused reduced the percentage skin loosening (p < 0.05). The most appropriate parameters the IR radiation unit were determined to be radiation power at 1600 W, the radiation time 3 min, and the moisture content of hazelnut 4% (w.b.).
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
261
268
https://ijbse.ut.ac.ir/article_66829_40fbfe3935474a5178af11ff6cabdf4f.pdf
dx.doi.org/10.22059/ijbse.2017.238908.664973
Environmental impacts and economic benefits of manure management chain with biogas production in a large scale dairy farm
Paria
Sefeedpari
Ph.D. student of Mechanical Engineering of Agricultural Machinery, Faculty of Agricultural Engineering and Technology, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
author
shahin
rafiee
Professor in Mechanical Engineering of Agricultural Machinery, Faculty of Agricultural Engineering and Technology, University College of Agriculture & Natural Resources, University of Tehran, Karaj, Iran.
author
Mohammad
Sharifi
University Of Tehran
author
Bashir
Abasi Dashtaki
null
author
Theun
Vellinga
Senior researcher, Department of Livestock and Environment, Wageningen University and Research, The Netherlands
author
text
article
2018
per
The manure management cycle from collection to application in dairy farming was evaluated from environmental and economic aspects for different scenarios including biogas production. For this purpose, manure characteristic is determined regarding the real feed ration composition. Environmental impacts and economic profitability of each scenario was calculated using standards and COMFAR program, respectively. The results showed although biogas production is costly but it is profitable with initial investment of 125 billion Rials (2,777,778 €) and a payback period of about 3 to 4 years. The internal rate of return was calculated as 24% considering a discount rate of 20%. The internal rate of return shows that although this investment is risky, the amount of income is acceptable. Scenario 4 including digestate processing using a mechanical separator followed by composting has the maximum avoided methane emission (-261 kg CO2eq m-3). Emissions mitigation was calculated to be 36% and 17% in scenario 2 and 4, respectively. Solid/liquid separation and sand separation have less impact on emission reduction withy different economic advantages. Regarding the results of this study, a large amount of greenhouse gases and emissions to water and soil has mitigated thank to biogas production.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
269
284
https://ijbse.ut.ac.ir/article_66830_37846ae709eb9ed5f99105276480810d.pdf
dx.doi.org/10.22059/ijbse.2017.239897.664979
Application of CFD in optimization of solar dryer absorber plate
Mernush
Motahayyer Razdari
University of Tehran, Aburaihan campus
author
Akbar
Arabhosseini
دانشگاه تهران
author
Hadi
Samimi Akhijahani
University of Kurdistan
author
Morteza
Khashehchi
University of Tehran - Abouraiahan Campus
author
text
article
2018
per
One of the ways to use solar energy is to use a solar dryer. But these kind of dryers have low efficiency that optimizes their absorbent plate to increase efficiency and save energy. For this purpose, the air flow inside the compartment of the adsorbent plate of the solar dryer was simulated using the computational fluid dynamics modeling and the heat transfer process, flow distribution and air velocity inside the compartment were analyzed and finally, the plates were compared in vitro. In this research, three different modes of the page with the same input and three different output modes (circular, conventional and perforated) were investigated. In a porous sheet with porosity, the plate was used with a coefficient of 0.0314. The results showed that between analytical and empirical data, the explanatory factor (R2) was above 97%. There are circular and conventional heat accumulation in the corners, which, by changing the type of output and converting it to the perforated output state, Heat and heat accumulation are prevented.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
285
294
https://ijbse.ut.ac.ir/article_66831_420cde5ab89d403520af730f839fe65d.pdf
dx.doi.org/10.22059/ijbse.2017.240246.664981
Experimental Analysis of a Humidification- Dehumidification Solar Desalination System Equipped with a Photovoltaic-Thermal Collector
Hamid
Mortezapour
Shahid Bahonar University of Kerman
author
Mohammad Hassan
Mostafavi
Department of Biosystems Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
author
Kazem
Jafari Naeimi
Department of Biosystems Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
author
Mohsen
Shamsi
Department of Biosystems Engineering, Faculty of Agriculture, Shahid Bahonar University of Kerman, Kerman, Iran.
author
text
article
2018
per
In this study, a novel solar water desalination system was proposed. The designed system worked based on the humidification – dehumidification (HD) method. It was comprised of a photovoltaic-thermal (PVT) evaporator, a condenser, fresh and saline water tanks, an air blower, and a water pump. The performance evaluation tests were conducted at three velocities of air leaving the exhaust pipe (1, 1.5 and 2m/s) and three levels of saline water passing over the photovoltaic module (94, 189 and 283kg.h-1 per m2 collector surface). The results showed that the highest evaporator efficiency was about 80% and the maximum daily evaporated water was about 7.4kg, which were observed at the water flow rate of 189kg.h-1m-2 and the air velocity of 2m/s. Whereas, a maximum condenser effectiveness of 61% and fresh water production of about 4.8kg per day were found at the water flow rate of 189kg.h-1m-2 and the air velocity of 1m/s. Although operating temperature of the conventional photovoltaic module was considerably higher than the PVT collector at the different working conditions, its electrical efficiency was also higher due to the more absorption of solar energy.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
295
305
https://ijbse.ut.ac.ir/article_66832_2b8acd2161048b0010b3326d014a5a2f.pdf
dx.doi.org/10.22059/ijbse.2017.241910.664985
Performance of an Egg Incubator instrumented with Hybrid System Based on Fuzzy Controller in compare with commercial Incubator
Ibrahim
Ahmed-Ibrahim-Hassan
Department of Agricultural Machinery Engineering, University of Tehran
author
Reza
Alimardani
Department of Agricultural Machinery Engineering, University of Tehran
author
Ali
Hajiahmad
Department of Agricultural Machinery engineering
author
Hamid
Abdolmaleki
Department of Agricultural Machinery Engineering, University of Tehran
author
text
article
2018
per
The first step in chicken breeding is the production of chicks, which requires a high-performance incubator. In this research, the performance of two incubators was compared. One of them was instrumented with a hybrid system based on fuzzy controller (HIFC), another one was the commercial incubator (ON/OFF). By comparing the important parameters to make suitable conditions for eggs hatchery, the percentage of eggs hatching, egg weight changes, chick’s hatch time and energy consumption were compared and evaluated. The result showed that the eggs hatching ratio was 92.13% for HIFC and 78.16% for ON/OFF systems. The HIFC system showed a better result in controlling egg environmental conditions than the ON/OFF system, based on eggs weight changes and chick’s hatch time. The energy consumption of the fuzzy controller was 31.25% less than the ON/OFF controller. The amount of energy received by the solar hybrid system over a 21 day periods was 27.20 kWh. For the HIFC system, the amount of energy needed for a hatching period was 24.24 kWh which shows an excess energy of 12.21%. For the ON/OFF system, contribution of solar hybrid system for power requirement was 77%.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
307
318
https://ijbse.ut.ac.ir/article_66833_9e71cc8f62f8f0f8d58843c440c9ebc3.pdf
dx.doi.org/10.22059/ijbse.2018.246599.665014
Evaluation the separated and combined effect of Mentha aquatic extract in stabilizing of sunflower oil under thermal condition
reza
Esmaeilzadeh kenari
department of food sciences and technology,sari agricultural sciences and natural resources university
author
maryam
asnaashari
sari agricultural sciences and resources university
author
text
article
2018
per
The extracts of Mentha aquatique by ultrasound assisted and maceration (ethanol: water (80:20)) extraction method were compared. The total phenolic content of extracts were obtained 45.16 mg GA/g and 51.92 mg GA/g Extract in maceration and ultrasound-assisted method respectively. The antioxidant activity of different concentration of extracts (50, 100, 250, 500, 1000 and 1500 ppm) were measured by DPPH radical scavenging method. The results shows that in both extracts by increasing in concentration of extract antioxidant activity were increased. Both extract at 1000 ppm of concentration have no significant statistical difference by TBHQ and they selected to add in sunflower oil. The thermal stability of samples containing separated and mixture extracts (1000 ppm) evaluated at 180 °C. TBHQ at 100 ppm served as standard besides the control. The results showed that during frying process oil oxidation were increased. Control sample had the least oxidative stability and sample containing mix extract showed the highest oxidative stability. Finally 1000 ppm of the mix extract could act better than 100 ppm TBHQ in inhibition of lipid oxidation in sunflower oil during frying process and it suggest as a natural antioxidant to use in edible oils.
Iranian Journal of Biosystems Engineering
دانشگاه تهران
2008-4803
49
v.
2
no.
2018
319
328
https://ijbse.ut.ac.ir/article_66834_b0229797ae9f9db6ff3b0d1fabd6cd32.pdf
dx.doi.org/10.22059/ijbse.2018.247669.665018