Recent advances in solar drying system: A Review

2021 ◽  
Vol 8 (1) ◽  
pp. 1-13
Author(s):  
Amir Abdul Razak ◽  
M A S M Tarminzi ◽  
M A A Azmi ◽  
Y.H Ming ◽  
MRM Akramin ◽  
...  
Keyword(s):  
Agricultural Products ◽  
Photovoltaic System ◽  
Solar Drying ◽  
Nutritional Values ◽  
Electrical Heater ◽  
Advantages And Disadvantages ◽  
System A ◽  
Solar Dryer ◽  
Recent Advances ◽  
Drying System

Research on solar dryer technology proliferates since it reduces the drying period while keeping nutritional values in the agricultural products. This paper presented a review of recent advances in the solar drying system. This review is composed of working principles and classifications of solar dryers. They were classified into two main elements: airflow modes, either passive or active, and the way heat is transferred: direct, indirect, mixed-mode, and hybrid. The hybrid system used several types of elements to supply additional heat in the drying system, as elaborated in this paper, such as the electrical heater, biomass, and photovoltaic system. The advantages and disadvantages of the solar dryer also being discussed in this paper

Improvement of the Thermal Performance of Solar Drying Systems Using Different Techniques: A Review

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Messaoud Sandali ◽  
Abdelghani Boubekri ◽  
Djamel Mennouche
Keyword(s):  
Heat Pump ◽  
Climatic Conditions ◽  
Operating Conditions ◽  
Solar Drying ◽  
Drying Time ◽  
Buoyant Force ◽  
Circulation Mode ◽  
Solar Dryer ◽  
Drying System ◽  
Air Circulation

Solar drying is one of the most important processes of preserving agricultural products. This review paper focused mainly on the enhancement of efficiency a solar drying system. The establishment of different techniques and factors, which may affect the performance of solar dryers, helps to improve solar dryers’ effectiveness. Different types of solar dryers were described here; moreover, various performance analyses of solar drying systems (SDSs) were presented. Factors and techniques for improving efficiency of solar dryers were discussed as well. The effect of operating conditions, geometrical conditions, adding of reflectors, heat exchanger, heat pump, photovoltaic source, air circulation mode, and phase change material (PCM) on the efficiency of a solar drying system were studied and discussed. Results showed that climatic conditions such as ambient temperature and solar radiation have an important influence on the solar dryer performance. The chimney integrated in solar dryer increases the buoyant force applied on the air stream to maintain a greater air flow velocity, which removes one side of moisture. The concentrators found to be effective in reducing the drying time by increasing the air temperature inside the dryer. Photovoltaic panels provides electricity source to run electrical components such as the fan to provide a forced air circulation that removes more moisture from the product compared with the natural convection or the heat pump to ensure the drying process at night. PCMs store the thermal energy during sunshine hours and release it after sunset, which can reduce the heat losses and improve the thermal efficiency of the drying system.

scholarly journals РАЗРАБОТКА И ИСПЫТАНИЕ СОЛНЕЧНОЙ УСТАНОВКИ С ПОЛИКАРБОНАТНЫМ ПОКРЫТИЕМ ДЛЯ СУШКИ ПРОДУКТОВ СЕЛЬСКОГО ХОЗЯЙСТВА

World Science ◽  
2021 ◽  
Author(s):  
Ketevan Archvadze ◽  
Ilia Chachava ◽  
Ketevan Papava ◽  
Nanuli Khotenashvili ◽  
Riva Liparteliani ◽  
...  
Keyword(s):  
Vitamin C ◽  
Air Temperature ◽  
Laboratory Analysis ◽  
Agricultural Products ◽  
Solar Drying ◽  
Drying Process ◽  
Drying Time ◽  
Drying System ◽  
Natural Drying

The proposed solar drying system significantly reduces the drying time and improves the quality of the product, including the preservation of vitamins. When drying rosehip, a laboratory analysis for vitamin "C" showed that 28% of this vitamin is destroyed during natural drying, and 17% when using a solar dryer.The drying speed increases by 2.5 - 4 times compared to traditional outdoor drying.In the proposed installation, you can dry different agricultural products, you can change the coating of the solar drying unit. In S/D, the air temperature is higher than in the environment from about 13 to 32 degrees Celsius, depending on weather conditions.The drying process in the S/D apparatus allows you to ensure the purity of the products. S/D is covered and during the drying process the product is not contaminated with dust and rain, by influence of dew, is not damaged by birds, insects or wasps.This device is convenient for transportation, during the day it can be moved and rotated to align to the sun.The proposed solar dryer is easy to manufacture and can be widely used in large and small farms, private and subsidiary farms.

scholarly journals Experimental Analysis of Single Glazing, Double Glazing and Triple Pass Solar Dryer

2020 ◽  
pp. 70-73
Keyword(s):  
Moisture Content ◽  
Window Glass ◽  
Initial Moisture Content ◽  
Solar Drying ◽  
Average Value ◽  
Solar Dryer ◽  
Collector Efficiency ◽  
Drying System ◽  
Time Required ◽  
Drying Efficiency

Adjustable Multi glazing solar drying system is designed and fabricated for experimental study. The arrangement is made in the present model such that it can be wok as a single glazing, double glazing and multi-glazing solar dryer by adjusting the plain window glass (Glazing). The performance analysis and comparison of Single glazing (SGSD), double glazing (DGSD) and Triple pass solar drying system (TPSD) have been conducted by using red chilli. The performance curves show the effect of solar intensity on the collector efficiency, drying efficiency and pick-up efficiency of solar drying system. The collector efficiency of TPSD increased by 28.8% and 53% as compared to DGSD & SGSD respectively at average value of solar radiation 674.4 W/m² at 26.90 gm per second of air mass. The initial moisture content in red chili was measured and found 78.8 (wb) reduced to minimum moisture content 9.8% (wb). It could be concluded that, the time required to dry the red chilli in TPSD is minimum as compared to SGSD and DGSD.

scholarly journals Design and development of natural convective solar dryer

2021 ◽  
Vol 11 (4) ◽  
pp. 144-150
Author(s):  
Baibhaw Kumar ◽  
L. Gábor Szepesi ◽  
Zoltán Szamosi
Keyword(s):  
Heat Source ◽  
Developing Nations ◽  
External Heat ◽  
Agricultural Products ◽  
Wood Chips ◽  
Solar Drying ◽  
External Heat Source ◽  
Solar Dryer ◽  
Drying Behavior ◽  
Drying Efficiency

Solar drying has emerged as a potential drying solution for agricultural products in many developing nations. The drying behavior of the product to be dried depends on many parameters of the dryer. A box-type natural convective solar dryer was developed to analyze the drying performance of Wood chips. Experiments revealed promising drying results with drying efficiency. The design of the dryer could further be enhanced by hybridization with an external heat source.

scholarly journals Energy-economic-environmental analysis of solar drying system: a review

2020 ◽  
Vol 11 (2) ◽  
pp. 1011
Author(s):  
Wan Nurlaila Yusra Mat Desa ◽  
Ahmad Fudholi ◽  
Zahira Yaakob
Keyword(s):  
Co2 Emission ◽  
Economic Cost ◽  
Solar Drying ◽  
Carbon Credit ◽  
Carbon Mitigation ◽  
Environmental Implications ◽  
Environmental Evaluation ◽  
System A ◽  
Wide Range ◽  
Drying System

Solar drying is an emerging technology to preserve wide range of products from agriculture to animal-based products. The application of solar dryers, however must be evaluated to determine its benefit and effectiveness. In the evaluation of solar dryer performance, three criteria which are most important to look at are thermal performance, economic cost and environmental implications. Therefore, this paper attempts to review the thermoeconomic analysis and environmental evaluation on various solar drying system. Performance equations in energy–economic–environment analyses for solar drying syistems evaluation are presented. The CO2 emission, carbon mitigation, and earned carbon credit of various solar drying syistem are also presented.

Performance of a Solar Drying System Driven by a Hybrid Power System

2012 ◽  
Vol 455-456 ◽  
pp. 139-146
Author(s):  
Hao Zhong ◽  
Zhi Min Li ◽  
Tong Wu ◽  
Ming Jiu Yu ◽  
Run Sheng Tang
Keyword(s):  
Power System ◽  
Early Stage ◽  
Initial Moisture Content ◽  
Agricultural Products ◽  
Solar Drying ◽  
Test Results ◽  
Drying Time ◽  
Drying System ◽  
Drying Chamber

To increase the production and improve the quality of dried agricultural products, a new drying system with a hybrid driving power system was developed and tested. The system with total collector area of 100m2 is consisted of 10 drying units and each of them is consisted of 5 identical air collectors and a greenhouse-like drying chamber. Each of collectors in the system is equipped with a DC fan, powered by either 120W solar modules or a 300W wind turbine, and an AC fan, directly powered by the electricity from grid. Such drying system can operate in all time of any day and avoid any possible spoilage of dried products as found in conventional solar dryers due to the formation of mould on the surface of dried materials in the events of consecutive rainy days. Field test for the drying of 9 fruits was conducted from November to December in 2005. The results indicated that the system was very effective for the drying of fruits and the solar drying time for most of the materials to be investigated was only one third of that required in the natural sun drying. Test results also showed that the nocturnal ventilation of drying chambers at the early stage of drying exercise was necessary for materials with high initial moisture content in order to further shorten the solar drying time.

scholarly journals Performance study of a baffled solar dryer

AIMS Energy ◽  
2021 ◽  
Vol 9 (6) ◽  
pp. 1136-1146
Author(s):  
Cristiana Brasil Maia ◽  
◽  
Gisele Mol da Silva ◽  
Luiz Felippe Guardia Bianchi ◽  
André Guimarães Ferreira ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Solar Radiation ◽  
Moisture Content ◽  
Air Temperature ◽  
Solar Collector ◽  
Photovoltaic System ◽  
Performance Study ◽  
Electrical Heater ◽  
Solar Dryer ◽  
Time Required

<abstract> <p>This paper presents a hybrid solar dryer with baffles disposed of on the solar collector. When the levels of solar radiation are low, an electrical heater is used to increase the drying air temperature. A photovoltaic system feeds the electrical heater and the fans, and it is also used to preheat the drying air, increasing the temperature at the inlet of the solar collector. Experimental results of corn drying indicated that the baffles augmented the energy efficiency of the system (from 23.5 to 24.9%) and the temperature rise in the solar collector (from 13.5 to 20.2 ℃), reducing the time required for the corn to reach the final desired moisture content.</p> </abstract>

Konsumsi Energi Pada Alat Pengering Surya dan Tipe Bak Untuk Pengeringan Biji Kakao

2019 ◽  
Vol 17 (3) ◽  
Author(s):  
Lamhot P. Manalu
Keyword(s):  
Specific Energy ◽  
Fossil Fuels ◽  
Negative Impact ◽  
Solar Irradiation ◽  
Drying Process ◽  
Food Industries ◽  
Solar Dryer ◽  
Agricultural Applications ◽  
Drying System ◽  
Drying Efficiency

Crop drying is essential for preservation in agricultural applications. It is performed either using fossil fuels in an artificial mechanical drying process or by placing the crop under the open sun. The first method is costly and has a negative impact on the environment, while the second method is totally dependent on the weather. The drying process requires a lot of energy in relation to the amount of water that must be evaporated from the product. It is estimated that 12% of the total energy used by the food industries and agriculture absorbed in this process. Due to the limitation of energy resources, it is important to keep researching and developing of diversification and optimization of energy This study aims to assess the use of energy for cocoa drying using solar energy dryer and bin-type dryer, as well as to determine the drying efficiency of each type of dryer. The results showed that the efficiency of the solar dryer drying system ranges between 36% to 46%, while the tub-type dryers between 21.7% to 33.1%. The specific energy of solar dryer ranged from 6.17-7.87 MJ / kg, while the tub-type dryers 8.58-13.63 MJ / kg. Dryer efficiency is influenced by the level of solar irradiation and the amount of drying load, the higher the irradiation received and more cocoa beans are dried, the drying efficiency is also higher and the specific energy further down.Proses pengeringan memerlukan banyak energi sehubungan dengan banyaknya air yang harus diuapkan dari bahan yang dikeringkan. Pengeringan dapat dilakukan dengan menggunakan pengering mekanis berbahan bakar fosil atau dengan menempatkan produk di bawah matahari terbuka. Metode pertama adalah mahal dan memiliki dampak negatif pada lingkungan, sedangkan metode kedua sangat tergantung pada cuaca. Diperkirakan bahwa 12% dari total energi yang dipergunakan oleh industri pangan dan pertanian diserap untuk proses ini. Mengingat semakin terbatasnya sumber energi bahan bakar minyak maka usaha diversifikasi dan optimasi energi untuk pengeringan perlu terus diteliti dan dikembangkan. Salah satunya adalah pemanfaatan energi surya sebagai sumber energi terbarukan. Penelitian ini bertujuan untuk mengkaji penggunaan energi untuk pengeringan kakao dengan memakai pengering energi surya dan pengering tipe bak, serta untuk mengetahui efisiensi pengeringan dari masing-masing tipe pengering. Hasil kajian menunjukkan bahwa efisiensi total sistem pengeringan alat pengering surya berkisar antara 36% dan 46%, sedangkan pengering tipe bak antara 21.7% dan 33.1%. Kebutuhan energi spesifik alat pengering surya berkisar antara 6.17-7.87 MJ/kg, sedangkan alat pengering tipe bak 8.58-13.63 MJ/kg. Efisiensi alat pengering dipengaruhi oleh tingkat iradiasi surya dan jumlah beban pengeringan, semakin tinggi iradiasi yang diterima pengering serta semakin banyak biji kakao yang dikeringkan, maka efisiensi pengeringan juga semakin tinggi dan kebutuhan energi spesifik semakin turun.Keywords: energy, efficiency, cocoa, solar dryer, bin-type dryer.

Withdrawn: Optimization of MPPT Controller Based on the Parameter Estimation for a Stand-alone Photovoltaic System

2019 ◽  
Vol 12 ◽  
Author(s):  
Abdelaziz Salah Saidi ◽  
Ayachi Errachdi ◽  
Chokri Ben Salah ◽  
Mohammad Fazle Azeem ◽  
Mohamed Arbi Khlifi
Keyword(s):  
Parameter Estimation ◽  
Photovoltaic System ◽  
Electronic Engineering ◽  
Recent Advances ◽  
Mppt Controller ◽  
Copyright Permission ◽  
Legal Right

The article for the journal Recent Advances in Electrical and Electronic Engineering has been withdrawn on the request of the authors due to some fees issues related to his university. Bentham Science apologizes to the readers of the journal for any in convenience this may cause. BENTHAM SCIENCE DISCLAIMER: It is a condition of publication that manuscripts submitted to this journal have not been published and will not be simultaneously submitted or published elsewhere. Furthermore, any data, illustration, structure or table that has been published elsewhere must be reported, and copyright permission for reproduction must be obtained. Plagiarism is strictly forbidden, and by submitting the article for publication the authors agree that the publishers have the legal right to take appropriate action against the authors, if plagiarism or fabricated information is discovered. By submitting a manuscript the authors agree that the copyright of their article is transferred to the publishers if and when the article is accepted for publication.

Recent Advances in Reinforcement Learning for Traffic Signal Control

2021 ◽  
Vol 22 (2) ◽  
pp. 12-18 ◽  
Author(s):  
Hua Wei ◽  
Guanjie Zheng ◽  
Vikash Gayah ◽  
Zhenhui Li
Keyword(s):  
Reinforcement Learning ◽  
Real World ◽  
Intelligent Transportation Systems ◽  
Transportation Systems ◽  
Traffic Signal ◽  
Signal Control ◽  
Traffic Signal Control ◽  
Control Methods ◽  
Advantages And Disadvantages ◽  
Recent Advances

Traffic signal control is an important and challenging real-world problem that has recently received a large amount of interest from both transportation and computer science communities. In this survey, we focus on investigating the recent advances in using reinforcement learning (RL) techniques to solve the traffic signal control problem. We classify the known approaches based on the RL techniques they use and provide a review of existing models with analysis on their advantages and disadvantages. Moreover, we give an overview of the simulation environments and experimental settings that have been developed to evaluate the traffic signal control methods. Finally, we explore future directions in the area of RLbased traffic signal control methods. We hope this survey could provide insights to researchers dealing with real-world applications in intelligent transportation systems

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