scholarly journals Study on Performance of Solar Dryer with Thermal Storage and Desiccant

2021 ◽  
Vol 9 (VI) ◽  
pp. 338-343
Author(s):  
Mr. Jeevan Gaikwad
Keyword(s):  
Thermal Storage ◽  
Drying Rate ◽  
Solar Drying ◽  
Solar Dryer ◽  
Exhaust Heat ◽  
Higher Temperature ◽  
Forced Air ◽  
Flat Plate Solar Collector ◽  
Air Circulation ◽  
Drying Chamber

This paper presents experimentation on model developed to compare the performance of solar drying with and without dehumidification system. Basic components of system consist of flat plate solar collector, drying chamber, desiccant bed and blower to maintain forced air circulation inside the system. Humidity of fresh air supplied to collector reduced by passing it through two stationary desiccant beds, which work alternately for adsorption and regeneration. Exhaust heat used for regeneration thereby overall efficiency of system increased. Drying rate obtained from solar drying with desiccant bed, solar drying without desiccant bed and open sun drying are 0.1094 Kg/hour, 0.09375 Kg/hour, and 0.0775 Kg/hour respectively. It concluded that by use of desiccant bed increases drying rate that takes near about three hours less to reach same moisture content compared with solar drying without desiccant bed. From results obtained it further found that desiccant bed based solar dryer gives higher drying chamber efficiency than without desiccant bed system due to increased moisture pick-up capacity. Also, in built latent heat thermal storage was able to provide 7 to 8 0C higher temperature than surrounding after sunset for about 2 hours.

scholarly journals Mathematical Modeling and Performance Analysis of a New Hybrid Solar Dryer of Lemon Slices for Controlling Drying Temperature

Energies ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 350 ◽  
Author(s):  
Wengang Hao ◽  
Shuonan Liu ◽  
Baoqi Mi ◽  
Yanhua Lai
Keyword(s):  
Air Temperature ◽  
Dual Function ◽  
Suitable Model ◽  
Drying Process ◽  
Drying Characteristics ◽  
Solar Dryer ◽  
And Performance ◽  
Drying Curves ◽  
Flat Plate Solar Collector ◽  
Drying Chamber

A new hybrid solar dryer was designed and constructed in this study, which consisted of a flat-plate solar collector with dual-function (DF-FPSC), drying chamber with glass, fan etc. The DF-FPSC was firstly applied in drying agricultural products. The innovative application of hybrid solar dryer can control the drying chamber air temperature within a suitable range by different operation strategies. Drying experiments for lemon slices in the hybrid solar dryer were conducted by comparing open sun drying (OSD). Eight mathematical models of drying characteristics were employed to select the most suitable model for describing the drying curves of lemon slices. Furthermore, energy, exergy economic and environment (4E) analysis were also adopted to analyze the drying process of lemon slices. The results show that under the same experimental condition, the drying capability of the hybrid solar dryer was stronger than that of OSD. Meanwhile, it was found that the Two term and Wang and Singh models were the most suitable for fitting the lemon slices’ drying characteristics inside the hybrid solar dryer. The drying chamber air temperature can be controlled under about 60 °C during the process of lemon slices’ drying. The experimental results show the feasibility and validity of the proposed hybrid solar dryer.

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 SDSim: A Novel Simulator for Solar Drying Processes

2012 ◽  
Vol 2012 ◽  
pp. 1-25
Author(s):  
Yolanda Bolea ◽  
Antoni Grau ◽  
Alexandre Miranda
Keyword(s):  
Mathematical Model ◽  
Thermal Storage ◽  
System Model ◽  
Specific Situation ◽  
Solar Drying ◽  
Simulation Process ◽  
Solar Dryer ◽  
Drying Efficiency ◽  
User Friendly ◽  
Suitable System

SDSim is a novel solar dryer simulator based in a multicrop, inclined multipass solar air heather with in-built thermal storage mathematical model. This model has been developed as a designing and developing tool used to study and forecast the behavior of the system model in order to improve its drying efficiency and achieving a return on the dryer investment. The main feature of this simulator is that most of the parameters are permitted to be changed during the simulation process allowing finding the more suitable system for any specific situation with a user-friendly environment. The model has been evaluated in a real solar dryer system by comparing model estimates to collected data.

scholarly journals Design Analysis and Performance of Greenhouse Based Solar Dryer

2021 ◽  
pp. 310-320
Author(s):  
Dalvi Piyush Hemant ◽  
Yeolekar Gaurav Laxman ◽  
Jadhav Akash Sampat ◽  
Prof. H. B. Wagh
Keyword(s):  
Food Products ◽  
Solar Drying ◽  
Data Logging ◽  
Food And Agriculture ◽  
Solar Dryer ◽  
Extended Surface ◽  
Project Model ◽  
And Performance ◽  
Solar Powered ◽  
Drying Chamber

Solar Drying or solar dehydration is one of the important processes required for preservation of food and agriculture products. Bacterial growth and moisture is being removed in this process. It helps for preserving the food products for more long time. Solar drying is the oldest & effective method used for drying food products. The device used for preservation of food products using solar energy is called as solar dryer or solar dehydrator. The solar dryer is classified on the basis of mode of drying, circulation of air, type and arrangement of solar air collector. In this project, a solar powered indirect type food dryer is designed and developed. The dryer design is consisting of solar collector unit along with absorber made up of extended surface of aluminum sheet with staging, drying chamber with three columns of each rack shelves, chimney for exhaust air, a solar powered fan. The dryer collector and drying chamber are connected with a hose pipe clamped to both ends. The project model of solar dryer is consisting of a monitoring unit for data logging of continuous updatation of parameters like temperature inside the dryer and temperature at ambient condition, humidity at inside and outside of dryer also the atmospheric pressure, etc. At the end we are going to investigate the effectiveness of solar dryer with above parameters.

scholarly journals Uji kinerja Alat Pengering Ikan Tipe Green-House Effect (GHE) Vent Dryer

2020 ◽  
Vol 13 (2) ◽  
pp. 84-93
Author(s):  
Muhammad Yasar ◽  
Raida Agustina ◽  
Mustaqimah Mustaqimah ◽  
Diswandi Nurba
Keyword(s):  
Relative Humidity ◽  
Solar Irradiation ◽  
Business Sector ◽  
Drying Process ◽  
Air Velocity ◽  
Fresh Fish ◽  
Green House ◽  
Solar Dryer ◽  
Air Circulation ◽  
Drying Chamber

Abstrak. Diantara permasalahan yang dihadapi oleh sektor usaha perikanan ialah  belum efisiennya teknis pengelolaan  dan tidak stabilnya kontinuitas produksi. Hal ini disebabkan oleh kurangnya sarana prasarana untuk mengolah ikan serta sistem pemasaran ikan segar yang masih konvensional, sehingga cepat membusuk apabila tidak diolah lebih lanjut. Penanganan dan pengolahan yang cepat dan tepat diperlukan untuk mengurangi resiko pembusukan dan dapat meningkatkan nilai jual hingga sampai kepada konsumen. Salah satu teknologi untuk meningkatkan masa simpan ikan ialah dengan cara proses pengeringan. Sebuah alat pengering ikan Green-House Effect (GHE) telah dikembangkan. Pengujian dan analisis alat pengering untuk ikan tersebut disajikan dalam makalah ini. Pengering surya ini menambahkan ventilator berupa exhaust fan guna memaksimalkan proses sirkulasi udara di dalam ruang pengeringan. Parameter yang diukur dalam pengujian ini adalah distribusi suhu, kelembaban relatif, iradiasi dan pengukuran kecepatan udara. Hasil penelitian menunjukan bahwa temperatur di dalam ruang pengering terlihat lebih tinggi yaitu 67°C dibandingkan dengan temperatur di lingkungan karena sifat absorber yang mampu menyerap panas. Sementara itu kelembaban relatif di dalam ruang pengering lebih rendah jika dibandingkan dengan kelembaban di lingkungan yaitu sebesar 30,1%. Nilai iradiasi surya yang diperoleh sangat berfluktuasi dengan nilai tertinggi adalah sebesar 180,6 W/m2. Kecepatan udara di dalam ruang pengering surya lebih stabil dibandingkan dengan kecepatan udara lingkungan karena adanya penambahan ventilator berupa exhaust fan. Hal inilah yang menyebabkan proses pengeringan menjadi lebih cepat.Performance of Green House Effect (GHE) Vent Dryer for Fish DryingAbstract. The problems that occur in the fishery business sector are inefficient and unstable continuity of production. The reasons for this include the lack of infrastructure for processing fish and also the very limited marketing of fresh fish due to its fast-rotting nature if not further processed. Fast and precise handling and processing are needed to reduce the risk of spoilage. One of the technologies to increase the shelf life of fish is the drying process. A greenhouse effect vent dryer type fish dryer has been developed. The testing and analysis of the dryer for these fish are presented in this paper. This solar dryer adds a ventilator in the form of an exhaust fan to maximize air circulation in the drying chamber. The parameters measured in this test are temperature distribution, relative humidity distribution, solar irradiation, and air velocity measurement. The results show that the temperature in the drying chamber is 67 ⸰C higher than the temperature in the environment due to the nature of the absorber which can absorb heat. Meanwhile, the relative humidity in the drying chamber was lower than the humidity in the environment, which was 30.1%. The value of solar irradiation obtained fluctuates where the highest irradiation is 180.6 W / m2. The air velocity in the solar dryer is more stable than the ambient airspeed due to the addition of a ventilator in the form of an exhaust fan. This causes the drying process to take place faster.

scholarly journals Design and Analysis of a Novel Drying Chamber in Indirect Forced Convection Solar Drying

2020 ◽  
Vol 9 (9s) ◽  
pp. 11-16
Keyword(s):  
Energy Efficiency ◽  
Forced Convection ◽  
Solar Collector ◽  
Ambient Air ◽  
Drying Rate ◽  
Solar Drying ◽  
Drying Time ◽  
Hot Air ◽  
Drying Chamber ◽  
Effective Distribution

Long drying time and less control on drying parameters in natural convection drying give way to forced convection indirect solar drying. In forced convection drying, an external blower supplies ambient air into the solar collector. The incoming air gets heated inside the collector and this air then flows into the drying chamber where the product to be dried is kept. The hot air absorbs the moisture from the raw crops and exits through the chimney. Along with the temperature and humidity of incoming air, its distribution inside the drying chamber is also important in the process of drying. The drying rate and quality can be improved if these parameters are under control in forced convection solar drying. In this paper, design and analysis of a novel drying chamber are presented to improve the performance and energy efficiency of solar drying with effective distribution of air inside the chamber. The variation of velocity with respect to different positions inside the drying chamber is also studied numerically.

scholarly journals Energy Analysis of a Hybrid Solar Dryer for Drying Coffee Beans

2020 ◽  
Vol 9 (1) ◽  
pp. 131-139
Author(s):  
Suherman Suherman ◽  
Hasri Widuri ◽  
Shelyn Patricia ◽  
Evan Eduard Susanto ◽  
Raafi Jaya Sutrisna
Keyword(s):  
Moisture Content ◽  
Solar Collector ◽  
Energy Analysis ◽  
Initial Moisture Content ◽  
Solar Drying ◽  
Drying Method ◽  
Drying Time ◽  
Solar Dryer ◽  
Coffee Beans ◽  
Drying Chamber

In this study, hybrid solar drying of coffee beans was performed, and energy analysis was carried out, to assess the system’s performance, in terms of energy efficiency, compared to solar drying and the open sun drying method. The dryer has three compartments: solar collector for collecting solar radiation, drying chamber, and a Liquid Petroleum Gas burner, which acted as an auxiliary heater to assist the thermal energy. The drying chamber has four trays for placing the dried product. The initial moisture content of coffee beans was 54.23% w.b and was reduced to the final moisture content between 11-12% w.b. The coffee beans dried faster when subjected to the solar hybrid drying method, compared to other methods, with the dryer temperature of 40°C, 50°C, and 60°C. Results indicated that the coffee beans’ drying times varied from 10 to 14 hours. However, at temperature 50°C and 60°C for the 1st tray, the water content was reduced more rapidly compared to the other tray. From the results of this study, we can see the different efficiency of solar collector that shows of 54.15% at variable temperature 60°C for drying time 12:00 to 14:00 p.m for hybrid solar drying and for the solar drying process is 50.07% at the range of drying time 12:00 to 14:00 p.m. Mathematical modelling shows that Page model is the most suitable for describing the coffee beans’ drying behaviour using a hybrid solar dryer. The effective diffusivity values found in this experiment are all in the acceptable range for most agricultural products. ©2020. CBIORE-IJRED. All rights reserved

scholarly journals EUCALYPTUS LOGS DRYING AT HIGH TEMPERATURES

2017 ◽  
Vol 41 (2) ◽  
Author(s):  
Aylson Costa Oliveira ◽  
Bárbara Luísa Corradi Pereira ◽  
Angélica de Cássia Oliveira Carneiro ◽  
Lucas de Freitas Fialho ◽  
Clarissa Gusmão Figueiró ◽  
...  
Keyword(s):  
High Temperatures ◽  
Water Loss ◽  
Total Loss ◽  
Drying Rate ◽  
Eucalyptus Urophylla ◽  
Drying Process ◽  
Forced Air ◽  
Air Circulation ◽  
Diameter Classes

ABSTRACT The objective of this work was to evaluate the drying speed of Eucalyptus urophylla logs in high temperatures and the influence of the presence or absence of bark and also the diameter of the log in the drying rate. Eucalyptus logs 60 cm long were divided into three diameter classes: 8-12 cm; 12,1-16 cm and 16,1-20 cm. The logs were dried in a heater with forced air circulation, in the presence or absence of bark in five temperatures: 50, 75, 100, 125 and 150ºC. The mass and the initial moisture were determined from each log and the water loss was kept up with periodic weightings, closing the drying process when the logs reached 20% moisture. The drying rate of the logs was calculated using the ratio between the total loss of moisture and the time in hours in order to reach the established moisture. It was concluded that the increase in temperature promotes the raise of the drying ratio, as being higher for smaller logs in relation to bigger ones and in addition to this, the bark effect was not significant in the drying of eucalyptus logs above 100ºC. It was also concluded that the best conditions for the operation of artificial dryers for Eucalyptus logs containing bark and separated in diameter classes would be at 125ºC.

scholarly journals ESTIMATIVA DO COEFICIENTE DE TRANSFERÊNCIA DE MASSA E VALIDAÇÃO DE UM MODELO DINÂMICO NÃO LINEAR PARA UM SECADOR SOLAR

2020 ◽  
Vol 35 (3) ◽  
pp. 404-414
Author(s):  
Victor Gonçalves Cremonez ◽  
Dile Pontarolo Stremel ◽  
Jorge Luís Monteiro de Matos ◽  
Ricardo Jorge Klitzke
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Dynamic Model ◽  
Least Squares Method ◽  
Drying Rate ◽  
Solar Drying ◽  
Solar Dryer ◽  
Non Linear ◽  
E Mail

ESTIMATIVA DO COEFICIENTE DE TRANSFERÊNCIA DE MASSA E VALIDAÇÃO DE UM MODELO DINÂMICO NÃO LINEAR PARA UM SECADOR SOLAR   VICTOR GONÇALVES CREMONEZ1, DILE PONTAROLO STREMEL2, JORGE LUIS MONTEIRO DE MATOS3, RICARDO JORGE KLITZKE4   1 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil. Faculdade de Tecnologia de Curitiba – FATEC-PR, Itacolomi, 450, Portão, Curitiba, Paraná, Brasil. E-mail: [email protected]; [email protected] 2 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil, E-mail: [email protected] 3 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil, E-mail: mailjmatos.ufpr.br 4 Departamento de Engenharia e Tecnologia Florestal, Universidade Federal do Paraná, Avenida Lothário Meissner, 632, Jardim Botâmico, Curitiba, Paraná, Brasil. E-mail: [email protected]   RESUMO: O objetivo deste trabalho foi estimar o coeficiente de transferência de massa e validar um modelo dinâmico não linear para um secador solar de madeira e biomassa. Para tal, foi construída uma estufa solar para secagem de madeira serrada e biomassa, com aproximadamente 1m³ de capacidade. Na estufa, foram secas tábuas de Eucalyptus spp.. Para a modelagem dinâmica foi proposto um balanço dinâmico em torno do material sólido, levando em conta a perda cinética da taxa de secagem em que esta depende do coeficiente de transferência de massa, parâmetro este que será ajustado levando em consideração a dinâmica do ambiente de secagem. Na otimização, foi utilizado o método dos mínimos quadrados não linear. Como resultado, foi possível elaborar um modelo dinâmico para a perda de umidade em relação ao tempo na secagem solar, bem como o coeficiente de transferência de massa. É possível concluir que o coeficiente de transferência de massa e os modelos encontrados podem ser utilizados para estimar os parâmetros de secagem em outras condições ambientais, como outra época do ano, outra cidade ou até outro país, melhorando assim as perspectivas do uso da secagem solar no meio rural.   Palavras-chave: taxa de secagem, secagem de madeira, secagem de biomassa.   ESTIMATION OF MASS TRANSFER COEFFICIENT AND VALIDATION OF A NON-LINEAR DYNAMIC MODEL FOR A SOLAR DRYER   ABSTRACT: The aim of this work was to estimate the mass transfer coefficient and to validate a dynamic non-linear model for a solar wood and biomass dryer. For this purpose, a solar dryer greenhouse was built to dry sawn wood and biomass, with approximately 1m³ of capacity. In the solar dryer, were dried boards of Eucalyptus spp.. For dynamic modeling, a dynamic balance around the solid material was proposed, taking into account the kinetic loss of the drying rate, which depends on the mass transfer coefficient, a parameter that will be adjusted taking into account the dynamics of the drying environment. in optimization, the nonlinear least squares method was used. As a result, it was possible to develop a dynamic model for the loss of moisture in relation to time in solar drying, as well as the mass transfer coefficient. It is possible to conclude that the mass transfer coefficient and the models found can be used to estimate drying parameters in other environmental conditions, such as: another time of the year, another city or even in another country, thus improving the prospects for the use of solar drying in rural areas.   Keywords: drying rate, wood drying, biomass drying.  

scholarly journals EXERGY ANALYSIS OF SOLAR DRYER WITH A BACKUP INCINERATOR

2020 ◽  
Vol 6 (8) ◽  
pp. 12-20
Author(s):  
Barki. E ◽  
Ukwenya J ◽  
Idoko F
Keyword(s):  
Exergy Analysis ◽  
Exergy Efficiency ◽  
Solar Drying ◽  
Drying Process ◽  
Solar Dryer ◽  
Agricultural Produce ◽  
Solar Radiation Intensity ◽  
Cloudy Weather ◽  
Experimental Values ◽  
Drying Chamber

Solar dryer with backup incinerator was fabricated with the aim of improving the efficiency of the drying rate of selected agricultural products. The dryer consist of three main parts, the collector, the drying chamber and the incinerator. 1000g of chill pepper was sun dried and 1000g was charged into the dryer for the experiment. Drying using solar drying process was carried out during clear weather while incinerator drying process was carried out during cloudy weather and at nights The collector, dryer and incinerator energy efficiencies were determined and reported elsewhere. Exergy analysis of the dryer was carried out for both solar drying and incinerator drying using the experimental values. The average exergy inflow and outflow during solar drying was found to be 266.97 KJ/Kg and 20.85 KJ/Kg respectively. The average exergy loss at airflow velocity of 2.7 m/s was found to be 269.3 KJ/Kg for incinerator drying. The exergy efficiency of the incinerator fluctuates as it starts from 7.9, 11.1, 5.2, 13.5, 8.0 and 3.6 % for 8.00, 10.00, 12.00, 14.00, 16.00, 18.00 hrs respectively. The result also shows exergy efficiency of 83.1, 85.9, 91.7, 92.4, 89.0 and 73.4 % for 8.00, 10.00, 12.00, 14.00, 16.00, 18.00 hrs respectively during solar drying. The experimental and analytical temperatures values were observed to be solar radiation intensity dependants and are directly proportional with it. Although the heat losses are high for both drying processes, the dryer is suitable for drying agricultural produce during clear, cloudy weather and at nights.

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