Special Issue I), (2020) Res (original) (raw)
Related papers
DEVELOPMENT OF GREEN HOUSE SOLAR TUNNEL DRYER FOR DRYING OF GREEN CHILLIES
In India, open sun drying is one of the most common way to dry and preserve agricultural products. Agricultural products are spread on ground and sun dried. During drying, products are not protected against dust and rain, rodents, birds and insects. This results in poor quality products due to contamination, high loss caused by uneven dehydration. Thus greenhouse tunnel dryer is developed. Design specifications and field performance of greenhouse solar tunnel dryer for drying 50 kg green chilies. A tunnel like framed structural covered with UV-stabilized polycarbonate sheet , hemispherical type solar tunnel dryer was designed, developed and performed at Thanjavur, Tamil Nadu, India with exposed area of 4.71 m 2 for drying green chilies, having an initial moisture content of 85% dry basis and to get a desired moisture content of 8-10% dry basis within two days. The performance of solar tunnel dryer for drying green chillies was evaluated through no-load and full-load conditions tests in November and December month. The dryer developed can be used in semi urban and rural areas for drying various agricultural crops for small scale industries which reduce cost.
Design and Development of Solar Dryer for Chilli Drying
International Journal of Research, 2015
A solar dryer was designed, fabricated and installed at Spices Research Centre, Bogra for drying of chilli. A DC fan of 10 watt was used for exhausting moisture with the help of a solar panel of 15 watt. In the solar dryer 8.75 kg dried chilli was obtained from 30 kg of red ripe chilli. The final drying levels of the red chili were obtained after 41 hours at upper tray and 46 hours at lower tray but took about 91 hours in the open sun drying system, having the same weather condition. The area of collector designed for 7.5 m 2 dryer was 4 m 2 . The necessary volumetric air flow rate was calculated as 0.11 m 3/ s at vent area of 0.03 m 2 . The average solar radiation, ambient temperature, ambient relative humidity, upper tray temperature, lower tray temperature, exhaust relative humidity, exhaust temperature and air flow rate was 110 W/m 2 , 34.34°C, 68.69%, 48.45°C, 43.53°C, 50.23%, 44.28°C and 26.38 m 3 /s respectively during experiment. The temperature in the dryer was significantly (P<0.01) higher than that of outside temperature. The initial and final moisture content of chilli in the dryer was 73% and 14% respectively. Again the initial and final moisture content of chilli in open sun was 73% and 18% respectively. The final drying levels of the red chili were obtained after 41 h at upper tray and 46 h at lower tray but took about 91 h in the open sun drying system having the same weather condition.
Thermal Performance of Natural Convection Solar Dryer for Drying Chilli
2019
The study assesses the performance of a natural convection solar dryer to dry chilli to overcome the shortcomings of traditional open sun drying. The dryer was consisting of two main components collector and drying chamber. A flat plate collector was used for generating hot air. A diffuser type chimney was used for exhausting moisture from the drying chamber. One kilogram of fresh ripe Chilli with moisture content 80% (wb) wastaken in the trays of the drying chamber. The final drying level of red chilli was obtained in the solar dryer after 20 h, but it took about 30 h for the same weather condition in the open sun drying system.
Performance Analysis of Chimney Type Solar Dryerfor Drying Chilli
2016
The performance of a chimney type solar dryer is tested for drying chilli under the metrological conditions of Surat, India. The system consists of a flat plate solar collector with a dry ing chamber. The air, allowed to enter the dryer, through collector inlet is heated up in the solar collector and allowed to flow through the drying chamber where it is utilized fo r drying i.e. removal of the moisture content from the food substance or agricultural produce loaded. Then its performance analysis using various parameters is carried out.
A Review of Solar Dryers Designed & Developed for Chilli
Social Science Research Network, 2021
Solar drying is an integral part of rural life for various products, especially vegetable, fruits & spices which are produced in rural areas and have no scientific means of preserving such raw products. This paper is an attempt to review the solar drying process & solar dryers used for chilli drying worldwide which includes types of solar dryer, drying process & techno economical feasibility of drying process. Open sun drying is very much common between farmers compared to solar drying by solar dryer due to various reasons especially economic viability. Research is going on for improvement in process, types of dryer used for improving efficiency and cost of drying
A Review of Solar Dryers Designed & Developed for Chilli
SSRN Electronic Journal, 2021
Solar drying is an integral part of rural life for various products, especially vegetable, fruits & spices which are produced in rural areas and have no scientific means of preserving such raw products. This paper is an attempt to review the solar drying process & solar dryers used for chilli drying worldwide which includes types of solar dryer, drying process & techno economical feasibility of drying process. Open sun drying is very much common between farmers compared to solar drying by solar dryer due to various reasons especially economic viability. Research is going on for improvement in process, types of dryer used for improving efficiency and cost of drying
Study of the drying kinetics of red chili (Capsicum annuum) in an indirect solar dryer tunnel type
Revista Tecnologías en Procesos Industriales, 2021
The drying process is very intensive in energy consumption. Mexico is a major producer of food, especially of varieties of chilies, with quality culinary and medicinal properties. The 65% of the national market as a dry product, which gives a benefit. In the drying process, the convective technology was used, using a horizontal tunnel with direct solar heating air. The kinetics of the solar dryer with direct heating is possible, with an average drying time of 16 hours of solar irradiance. The tests were performed in Temixco, Morelos, Mexico, located at 18 º 51 'of LN and 99º 14' of LO, with average values of 850 W/m2 irradiance maximum. The chamber temperatures were in a range between 31 and 45 °C. The air velocity range was set between 1.3 and 2.4 m/s. Final moisture contents of the dried chili were obtained in a range between 8% and 6% h.b. with an average drying velocity of 4.7 humidity degree/h. The solar direct drying is a technology that allows recovering and trying di...
The Solar Tunnel Dryer can provide the best alternative method to dry red chillies in less time. The performance of the solar tunnel dryer depends on various parameters such as ambient temperature, solar radiation intensity, wind velocity, relative humidity, temperature of air inside the solar tunnel dryer etc. The experimentations are carried out at Umrer in Vidarbha region of Maharashtra. In this work Solar Tunnel Dryers (STD) performance is investigated by varying different process parameters, which includes absorber material (ABM), polyethene cover thickness (CT), air flow velocity over drying bed (AFV) and drying bed thickness (DBT). Three different levels of each parameter are chosen to form different combinations of experiments using Taguchi L9 orthogonal array. Total 9 experiments are designed and fabricated for drying 5 kg of red chilli. The initial moisture content of red chilli is 80% which is reduced to 5%. The efficiency, % of moisture removed and drying time of individual STD are investigated. Considerable reduction in drying time and better quality of dried products are observed as compared to open sun drying.
Assessment on Hybrid Solar Dryer for an Effective Red Chili Drying Process
E3S Web of Conferences
This study aims to assess hybrid solar drying method for processing red pepper compared to sun drying and solar drying. Independently selecting heat variables of 40 °C, 50 °C, 60 °C, 70 °C, and 80 °C, the temperature profiles, drying curves, thermal efficiency and effectiveness, and energy and exergy were analyzed to meet the standardized moisture content of the product as well as other features (color, vitamin C content, and β-carotene content). It was found that the drying rate decreased when the temperature rose, while the drying chamber efficiency and drying effectiveness were inversely proportional to the duration. The collector became the most efficient at 40 °C. The drying air temperature is directly proportional to utility, energy efficiency, exergy input, exergy ouput, exergy loss, exergetic efficiency, and development potential while inversely proportional to the energy utilization ratio. Drying red pepper with a hybrid solar dryer at all observed temperatures was deemed a...
Drying of chilli using solar cabinet dryer coupled with gravel bed heat storage system
The solar cabinet dryer coupled with gravel bed heat storage system was evaluated for drying of green chilli. The loading capacity of the dryer was about 15 kg of fresh produce per batch. An exhaust fan was provided in the drying chamber to suck the hot air from gravel bed heat storage during off sun shine hours for better heat retrieval. The temperature was recorded in the solar dryer at three position viz., lower, middle and upper drying trays using thermocouples and average temperature was observed in the range of 25 to 55°C. Drying time for drying green chilli from initial moisture content of 88.5% (wb) to 7.3% (wb) was estimated to be 56 h in solar dryer whereas 104 h was observed in the open sun drying. Drying time due to introduction of heat storage system was extended by 4 h after sunset. Drying efficiency of the solar cabinet dryer was found to be 34 %. The ascorbic acid content in chilli, dried in solar dryer coupled with gravel bed heat storage system and in open sun drying was found to be 55.3 mg/100g (d.b) and 50.22 mg/100g (d.b), respectively. The benefit cost ratio and pay back period for drying chilli in solar dryer coupled with gravel bed heat storage system was found to be 1.11 and 7 month and 11 day respectively.