scholarly journals Drying of washed clothing utilizing solar powered dryer

2021 ◽  
Vol 3 (1) ◽  
pp. 32-40
Author(s):  
Romero R.V ◽  
Romero N.V

This study made setups that can be used in solar powered drying of washed clothing. This was used to analyze and test the performance, and determined if there is significant difference on the drying rate of set ups related to traditional and experimental method. A solar drying chamber was designed to use local materials in which the frame is made of bamboo with walls made of plastic to trap the heat of the sunlight entering the chamber. There were four set ups that were established in the gathering of data: S-1 is with electric fan, S-2 is with electric fan and electric flat iron, S-3 which did not use the drying chamber, is a traditional method where the garments C-1, C-2, C-3, C-4 & C-5 of different sizes, shapes, width and weight were dried under the heat of the sun. S-4 is almost similar to S-3 but the difference is that the garments were dried with no sunlight. The drying chamber alone is effective to reduce the moisture content of the garments using sunlight. Using the electric fan and electric flat iron increased the circulation of the enclosed hot air and boasted the drying capacity. Although it was computed that P > ? in comparison of the data in all set ups, it is insufficient to conclude that there is no significant difference on data of the experimental and traditional set ups since the data for the traditional set ups are not complete until the garments are totally dried.

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.


Author(s):  
O. Taiwo Aduewa ◽  
S. Ajiboye Oyerinde ◽  
P. Ayoola Olalusi

The world is facing two major challenges: one is to meet the exponential growing demand for energy particularly in developing and underdeveloped countries and other is to deal with global, regional and local environmental impacts resulting from supply and use of conventional energy. The cost-effective technology for solar drying that can be easily adopted among the rural farmers of developing countries needs to be developed in areas where solar energy is abundantly available. As cheap as the solar energy could be, there are associated problems with the stability of the energy for different purposes due to instability of climatic conditions. For this research, a solar powered hot-air supplemented dryer (SPHSD) with a capacity of 20 kg of sliced yam was designed and developed. The SPHSD has three sections which are solar collector chamber, drying chamber and hot-air supplement chamber which is powered with two 150-watt solar panel and a 200 amps solar battery for continuous operation during bad weather. All data were logged digitally for accuracy and test was done using yam slices. Difference in drying time and stability in drying temperature was evaluated using SPHSD and indirect solar dryer. The result shows stability of temperature in the drying chamber when SPHSD was used while the drying temperature fluctuates throughout the indirect solar drying test period. Drying experiment was conducted for 481 minutes (between 0910 hrs to 1713 hrs) reducing the moisture content from 71.91%, 72.1% and 72.8% to 27.95%, 25.78% and 28.23% for MC1, MC2 and MC3in wet basis respectively. Drying experiment was conducted for 832 minutes (between 0901 hrs to 2257 hrs) reducing the moisture content from initial moisture content levels of 72.66%, 71.48% and 71.48% to 13.47%, 12.53% and 12.54% for MC1, MC2 and MC3in wet basis respectively.


2019 ◽  
Vol 801 ◽  
pp. 345-350
Author(s):  
Ratinun Luampon ◽  
Sungwarn Bunchan ◽  
Bundit Krittacom

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%.


Author(s):  
Dalvi Piyush Hemant ◽  
Yeolekar Gaurav Laxman ◽  
Jadhav Akash Sampat ◽  
Prof. H. B. Wagh

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.


Food Research ◽  
2020 ◽  
Vol 4 (S6) ◽  
pp. 64-69
Author(s):  
S. Yahya ◽  
A. Mohd Shahrir ◽  
M.A. Amir Syariffudden ◽  
A. Shafie ◽  
J. Mohammad Shukri ◽  
...  

A small scale convective dryer with tumbling mechanism was specially constructed for drying grated coconut. This new drying mechanism was evaluated in term of drying behaviour and colour quality of the final product. Three main factors that involved were hot air temperature, rotational speed (rpm) and air velocity. Every combined parameter of a sample was compared to each other and also with freshly grated coconut. It was found that the combination of 60°C, 6 rpm and 4.31 ms-1 had the shortest drying time as well as the highest drying rate among other combinations. In contrast, combination factors of 50° C, 3 rpm and 2.06 ms-1 had the lowest drying rate. Three main factors; temperature, rotational speed and air velocity were significantly contributed to the response of drying time as (p<0.05). Drying rate also increased with increase in temperature, rotational speed and air velocity. In term of colour analysis (L*, a*, b*), there was a significant difference among dried grated coconut samples. Nevertheless, sample 60˚C, 3 rpm and 4.31 ms-1 and 50˚C, 3 rpm and 4.31 ms-1 showed no significant different (p>0.05) in lightness when compared to freshly grated coconut hence excellent in retaining its original appearance. On top of that, sample (60˚C, 3 rpm and 4.31 ms-1 ) also achieved considerable drying rate with an acceptable drying time of 135 mins.


2011 ◽  
Vol 367 ◽  
pp. 517-524
Author(s):  
A. F. Alonge ◽  
O. O. Oniya

A solar drying system designed on the principles of convective heat flow, constructed from local materials was employed in drying yam (Dioscorea Alata). A glass collector having an efficiency of about 0.63 was used along with an absorber for absorbing the heat energy. The drying chamber consisted of drying trays. A chimney fitted at the top centre of the drying chamber enhanced airflow. Air passing through the collector heated up and dried the foodstuff in the drying chamber. The latitude of Ilorin is 8.26oN and the collector angle could be varied . 56o C, 41o C and 71o C were obtained as the maximum attainable temperatures for the drying chamber, ambient and collector respectively. Two samples of yam chips, each weighing 1560g and having an average size of 1cm thick, were dried both inside the dryer and outside the dryer within its surrounding. The initial moisture content of the yam was 70.3% (wet basis) and its final moisture content was 9% (wet basis).The result was compared to natural sun drying. It was observed that the drying time was reduced from 52 hours for sun drying to 45 hours for solar drying. The total cost of the construction was 6, 105 Naira.


2020 ◽  
Vol 4 (2) ◽  
pp. 79-84
Author(s):  
Selmitri Selmitri ◽  
Erlinda Yurisinthae ◽  
Radian Radian

The study aims to analyze the differences in the development of corn cultivation in peat soils between no-burning and traditional methods or with burning in Rasau Jaya District, Kubu Raya District. The fact that currently clearing forests is still using burning on agricultural land in general and especially on peat soil that is feared to experience underground burning is difficult to overcome and cause many losses. The development of corn on land without burning on peat soil is a solution for the community in maintaining ecosystem sustainability. The explanatory research is directed at testing hypotheses and following research objectives. Data collection by interview and questionnaire to 60 respondents were corn farmers on peat soil. The average difference test is used in explaining the difference in yield between the two methods of planting on peat soil. The results found that there were significant differences in the application of corn cultivation on peat soil without burning compared to the traditional method on the variables fertilizer, pesticide, business costs, and yields. In contrast, the planting area variable had no significant difference.


2014 ◽  
Vol 979 ◽  
pp. 11-15 ◽  
Author(s):  
Nattapon Srisittipokakun ◽  
Keerati Kirdsiri

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.


Author(s):  
Mr. Jeevan Gaikwad

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.


Author(s):  
J Li ◽  
J G Yan ◽  
Y F Wang ◽  
K Yang ◽  
Y Y Shao ◽  
...  

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