Experimental Performance of a Mix Mode Solar Dryer for Drying Centella Asiatica

2013 ◽  
Vol 770 ◽  
pp. 80-83 ◽  
Author(s):  
Nattapon Srisittipokakun ◽  
Keerati Kirdsiri
Keyword(s):  
Centella Asiatica ◽  
Weather Conditions ◽  
Agricultural Products ◽  
Wire Mesh ◽  
Small Scale ◽  
Hot Air ◽  
Solar Dryer ◽  
Drying Efficiency ◽  
To Receive ◽  
Drying Chamber

This paper describes a mixed mode natural convection of solar dryer. The dryer was designed for small-scale commercial producers of agricultural products in non-electrified locations. The products to be dried are placed in multi layer on a wire mesh in the drying tunnel to receive energy from both hot air supplied from the collector and incident solar radiation on products. Temperatures in the drying chamber varied from 28.0° C to 55.0° C depend on the weather conditions. To investigate its performance, the dryer was used to dry 30 kg of Centella asiatica in December 2012. The dryer could be used for Centella asiatica of 80% (wb) moisture content, and they could be dried within 4 hours, with 0% (wb) remaining moisture. In addition, the Centella asiatica being dried in the solar tunnel drier were completely protected from rain, insects and dust, and the dried Centella asiatica were high quality dried products terms of flavor, color and texture. The drying efficiency of the solar component alone was found to be 39.18%.

Drying Pineapple Using a Mix Mode Solar Dryer

2014 ◽  
Vol 979 ◽  
pp. 11-15 ◽  
Author(s):  
Nattapon Srisittipokakun ◽  
Keerati Kirdsiri
Keyword(s):  
Weather Conditions ◽  
Agricultural Products ◽  
Wire Mesh ◽  
Small Scale ◽  
Tunnel Dryer ◽  
Hot Air ◽  
Solar Dryer ◽  
To Receive ◽  
Local Materials ◽  
Drying Chamber

Pineapple was dried using a mix mode solar dryer developed in the Faculty of Science and Technology, Nakhon Pathom Rajabhat University, Nakhon Pathom, Thailand. The dryer was designed for small-scale commercial producers of agricultural products in non-electrified locations. The products to be dried are placed in multilayer on a wire mesh in the drying tunnel to receive energy from both hot air supplied from the collector and incident solar radiation on products. It is constructed in local materials then tested experimentally in food stuffs drying pineapple. With this dryer, 40 kg of pineapple can be dried within 4 days. The dryer reduces drying losses as compared to sun drying and show lower operational costs than the artificial drying. Temperatures in the drying chamber varied from 28.0 °C to 57.0 °C depend on the weather conditions. The dryer could be used for pineapple of 83% (w.b.) moisture content, and they could be dried within 4 days, with 15% (w.b.) remaining moister. In addition, pineapples being dried in the solar tunnel dryer were completely protected from rain, insects and dust, and the dried.

scholarly journals Solar Drying System Integrated with Phase Change Material (PCM)

2020 ◽  
Vol 9 (3) ◽  
pp. 1897-1902
Keyword(s):  
Energy Storage ◽  
Phase Change ◽  
Agricultural Products ◽  
Paraffin Wax ◽  
Cfd Simulations ◽  
Solar Dryer ◽  
Flat Plate Collector ◽  
Change Material ◽  
Drying Chamber

The post-harvest losses for agricultural products are around 30%-40% [1]. Drying is a one of the necessary processes for the preservation of agricultural products. Agricultural products require hot air of temperature above 40 ºC for drying. Open sun drying takes more time for drying of products due to slower drying rates. Also, various factors hamper the quality of the dried product. Due to the moisture content in the products bacterial attack is possible. India being the tropical region has good solar radiation. It is advisable to use the solar dryer to avoid spoilage of quality of products [2]. In this work, the compact and portable forced convection solar dryer designed and developed for drying chilies with thermal energy storage. Solar dryer is having capacity of 15 kg and it consists of the flat plate collector based air heating system with thermal energy storage. Paraffin wax used as phase change material (PCM). The CFD simulations carried out for the solar dryer to study the temperature distribution over the surfaces of the flat plate collector and inside the drying chamber, velocity of air and phase change behavior of paraffin wax inside the trays. The energy stored in the paraffin wax and time required for charging and discharging of paraffin wax is found out. The time for which temperature in the drying chamber is maintained above 40 oC is also found out. Results of CFD simulations validated with the experimental results.

Specific Energy Consumption Improvement with Applying Stainless Wire Mesh Porous Material for a Hot Air Dryer

2019 ◽  
Vol 801 ◽  
pp. 345-350
Author(s):  
Ratinun Luampon ◽  
Sungwarn Bunchan ◽  
Bundit Krittacom
Keyword(s):  
Energy Consumption ◽  
Porous Material ◽  
Specific Energy ◽  
Specific Energy Consumption ◽  
Wire Mesh ◽  
Experimental Result ◽  
Drying Rate ◽  
Hot Air ◽  
Air Dryer ◽  
Drying Chamber

This research was proposed to applying stainless wire mesh porous material for specific energy consumption improvement of a hot air dryer. In experimental consist two main parts, first part was a comparison of drying with and without hot air recirculation duct. Second part was a comparison of drying with and without stainless wire mesh porous material in drying chamber and hot air recirculation duct. Tilapia was drying product, stainless wire mesh in drying chamber was constant PPI=8 and 6 layers, stainless wire mesh in hot air recirculation duct was constant PPI=8 and varied layer at 6, 8 and 12 layers and hot air recirculation ratio 40%, 60% and 80%. Experimental result was, drying with hot air recirculation duct was higher drying rate than without recirculation duct and drying rate was increased, drying time was decreased and SEC was decreased with increased hot air recirculation ratio. At recirculation ratio 80%, SEC was lowest and decreased to 54.52% compared with without recirculation duct. Therefrom, the stainless wire mesh porous materials were inserted in the drying chamber and recirculation duct at PPI=8, 6 layers and PPI=8, 12 layers, respectively and used recirculation ratio 80%, it was found that SEC was lowest and decreased as about 62.21%.

Experimental Investigation of Active Solar Dryer for Drying of Chili

2014 ◽  
Vol 953-954 ◽  
pp. 16-19 ◽  
Author(s):  
Yuttachai Keawsuntia
Keyword(s):  
Experimental Investigation ◽  
Solar Collector ◽  
Agricultural Product ◽  
Drying Time ◽  
Sun Drying ◽  
Hot Air ◽  
Solar Dryer ◽  
Drying Chamber ◽  
Better Than

This research paper presents the experimental results of drying of chili by using the active solar dryer and sun drying because of chili is a commercial agricultural product of Thailand. The active solar dryer consisted of a solar collector, a drying chamber and a chimney. The small fans were installed in the solar collector of active solar dryer to provide the air flow circulated in the solar collector and a drying chamber. Drying of chili of 20 kg from moisture content 84 percent wet basis to 10 percent wet basis following the Thai Agricultural Standard (TAS 3001-2010) showed that the use of the active solar dryer to make the drying time reduced about 28.7 percent compared with sun drying because of the hot air temperature inside the drying chamber higher than the ambient temperature about 10 to 15 . The quality of dried chili from the active solar dryer better than dried chili from sun drying.

Performance Evaluation of a Solar Greenhouse Dryer at Different Bed Conditions Under Passive Mode

2019 ◽  
Vol 142 (1) ◽  
Author(s):  
Asim Ahmad ◽  
Om Prakash
Keyword(s):  
Performance Evaluation ◽  
Heat Storage ◽  
Superior Performance ◽  
Small Scale ◽  
Passive Mode ◽  
Maximum Heat ◽  
Gravel Bed ◽  
Drying Efficiency ◽  
Small Scale Industries ◽  
Drying Chamber

Greenhouse drying shows a significant role in the bulk level of drying. In the present setup, a greenhouse dryer operating under natural convection mode was designed and fabricated. The sensible heat storage concept was applied to the bed of the drying chamber. Four different beds, namely, gravel bed, ground bed, concrete bed, and black painted gravel bed was being selected for the comparative heat transfer analyses of the proposed setup. The maximum heat gain takes place at the black painted gravel bed conditions, i.e., 53%, while for concrete bed, gravel bed, and ground bed, it is 33%, 49%, and 29%, respectively. Hence, black painted gravel bed condition is strongly recommended for maximum heat storage. The proposed setup was used for drying of tomato flakes in black painted gravel bed condition. It has been found that the moisture content in the tomato flakes has been removed from 96% to 9.10% in 13 h. The average drying efficiency of the proposed greenhouse dryer is found to be 23.49%. The comparative analysis of the performance evaluation has been done with other investigators, and it was found that the drying rate of the proposed setup shows superior performance as compared with others. The design of the proposed greenhouse setup with black painted gravel bed condition is strongly recommended for small-scale industries and farmers.

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 Optimization of the Performance of Hybrid Solar Biomass Dryer for Drying Maize Using ANSYS Workbench

2020 ◽  
pp. 50-69
Author(s):  
Jackis Aukah ◽  
Mutuku Muvengei ◽  
Hiram Ndiritu ◽  
Calvin Onyango
Keyword(s):  
Heat Exchanger ◽  
Air Temperature ◽  
Small Scale ◽  
Air Velocity ◽  
Hot Air ◽  
Permissible Range ◽  
Feasible Option ◽  
Input Variables ◽  
Drying Chamber ◽  
Ansys Workbench

In this paper ANSYS workbench was used to optimize the performance of hybrid solar biomass dryer for drying shelled maize in order to find the optimal operating input variables when the air temperature within the drying chamber set within the permissible range at reasonably high flow velocity. Hybrid Solar dryer with biomass as a source of fuel for auxiliary heating during absence or low solar insolation is a feasible option for small scale maize farmers [1]. At times high temperatures are induced in this dryer which may result in grain fissures and breakage during milling, thus reducing the grain quality. Optimization results indicate that in order to keep the air temperature within drying chamber to permissible range [2], the air velocity at collector inlet and biomass heat exchanger outlet should be improved to 3 m/s and 2.8 m/s respectively while the capacity of the biomass heat exchanger should also be enhanced to provide hot air at 85°C. It be concluded from the study that HSBD is suitable for drying maize as well as other agricultural products since continuous interrupted drying can be achieved. The capability of the dryer to maintain uniform temperature and air flow within the drying chamber enable high quality dried products within a short duration.

Impact of drying method of figs with small-scale flat-plate solar collector

2016 ◽  
Vol 13 (5) ◽  
pp. 407-412 ◽  
Author(s):  
Fahim Ullah ◽  
Min Kang ◽  
Lubna Hassan ◽  
Ninghui Li ◽  
Jun Yang ◽  
...  
Keyword(s):  
Moisture Content ◽  
Flat Plate ◽  
Solar Collector ◽  
Agricultural Products ◽  
Ficus Carica ◽  
Solar Irradiation ◽  
Small Scale ◽  
Content Type ◽  
Flat Plate Solar Collector ◽  
Drying Chamber

Purpose The purpose of the study was to develop a performance flat-plate solar collector that would be used as a solar drier for fruit fig (Ficus carica L). This study proposes how and why solar energy is important for drying the agricultural products. This study aims to expand the domain of solar collector for different purposes and, most important, for agricultural resource normally found in the literature. Design/methodology/approach The paper opted for an exploratory study using the flat-plate solar collector with drying chamber for drying purposes of agricultural products. During the experiment, the data were collected with moisture content, drying rate of the product and solar irradiation falls on the collector. Findings This paper describes that how flat-plate collector works for agricultural products and how to reduce the moisture content in the product (fig). Efficiency of collector was evaluated under the ambient temperatures of 24°C. Efficiency also significantly increased from 53 to 55 per cent with an increase in ambient temperature from 22 to 24 °C. Figs (Ficus carica L) were dried in the drying chamber of the flat-plate solar collector. The products were dried at temperature of 55-65°C and 15 to 20 per cent humidity. Research limitations/implications Because of this research chosen, the research results are beneficiary for agricultural users for drying purposes. Therefore, the researchers are encouraged to dry the agricultural product with flat-plate solar collector, because it reduced the moisture content of the product very fast. Originality/value This paper fulfills an identified need to study that how flat-plat solar collector can be used.

scholarly journals CFD-Simulink Modeling of the Inflatable Solar Dryer for Drying Paddy Rice

2021 ◽  
Vol 11 (7) ◽  
pp. 3118
Author(s):  
Ana Salvatierra-Rojas ◽  
Iris Ramaj ◽  
Sebastian Romuli ◽  
Joachim Müller
Keyword(s):  
Weather Conditions ◽  
The Philippines ◽  
Percentage Error ◽  
Small Scale ◽  
Ansys Fluent ◽  
Matlab Simulink ◽  
Simulink Model ◽  
Solar Dryer ◽  
Small Scale Farmers ◽  
The University

Small-scale farmers in developing Asian countries have minimal agricultural mechanisms available to them. In the Philippines, postharvest losses in rice production can reach about 36% in the drying process alone. Thus, the inflatable solar dryer (ISD) was developed through the collaboration of the University of Hohenheim, the International Rice Research Institute, and GrainPro Philippines Inc. Although the ISD was successfully tested with different agricultural products, further characterization of the ISD design is required for predicting the drying performance. To this end, the airflow behavior in the ISD was simulated using computational fluid dynamics (CFD) via ANSYS Fluent. Moreover, a thermal model was developed in MATLAB/Simulink by taking into account heat transfer in the heating area and coupled heat and mass transfer within the drying area. Three batches of drying experiments were performed and airflow measurements were taken inside the dryer to validate the models. The MATLAB/Simulink model was further used to predict the drying performance under various weather conditions spanning 10 years. The simulated temperatures and moisture content in the ISD showed high accuracy (mean absolute percentage error (MAPE) < 10%) with the experimental data. The proposed dynamic model provides an efficient computational tool that can be applied to predict the drying performance and to optimize the ISD design.

scholarly journals Design consideration of smart solar dryer for precision drying

2021 ◽  
Vol 8 (2) ◽  
pp. 135-138
Author(s):  
TH BIDYALAKSHMI DEVI ◽  
YOGESH B KALNAR
Keyword(s):  
Dry Weight ◽  
Electrical Energy ◽  
Hot Air ◽  
Solar Dryer ◽  
Agricultural Produce ◽  
Solar Battery ◽  
Load Cells ◽  
Electrical Effect ◽  
Air Blower ◽  
Drying Chamber

A sensor based solar dryer was designed to control the drying environment for precision drying of agricultural produce. The system entirely used solar energy utilizing both thermal and electrical effect. Paraffin wax (PCM) was used for storage of thermal energy whereas solar battery was used to store the electrical energy. Hot air blower was also provided to supply heat when there is less or no solar radiation. Temperature sensors were provided to control the environment of drying chamber. The exhaust fan started operating depending on the set temperature and thus control the drying environment. Load cells were provided below each tray to measure the dry weight. The drying chamber was made of mild steel with glass wool insulation. The capacity of the designed dryer was 10-15 kg with 6 trays. The designed dryer has target temperature of 55-60oC.

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