Evaluation of thermal efficiency of oscillating-bed solar dryer through drying of sunflower seeds

2011 ◽  
Vol 3 (4) ◽  
pp. 043116 ◽  
Author(s):  
S. Shanmugam ◽  
P. Kumar ◽  
AR. Veerappan
Keyword(s):  
Thermal Efficiency ◽  
Sunflower Seeds ◽  
Solar Dryer

Modeling and Experimental Studies on Oscillating Inclined-Bed Solar Dryer

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
S. Shanmugam ◽  
P. Kumar ◽  
AR. Veerappan
Keyword(s):  
Thermal Efficiency ◽  
Experimental Studies ◽  
Absolute Humidity ◽  
Average Error ◽  
Sunflower Seeds ◽  
Double Pass ◽  
Solar Dryer ◽  
Agricultural Produce ◽  
The Absolute ◽  
Flat Plate Collector

This paper presents a mathematical model for drying agricultural produce using a solar dryer capable of oscillating its bed while kept at an inclined position with respect to vertical. A model of the solar dryer with double-pass flat plate collector and an oscillating-bed has been fabricated and tested for drying agricultural produce (sunflower seeds). The model can predict the change in the absolute humidity of air across the bed, the temperature of the air, the moisture content, and the dryer thermal efficiency. Sunflower seeds were dried on a physical model of the solar dryer with its bed tilted at different angles and oscillated at different frequencies. The predicted and the experimental results are in good agreement. The average error and standard deviation for the absolute humidity of air across the bed is 1.74 and 1.55%, the exit temperature of air leaving the bed is 1.11and 1.21%, and the dryer thermal efficiency is 0.78 and 1.33%, respectively.

scholarly journals Effect of openings collectors and solar irradiance on the thermal efficiency of flat plate-finned collector for indirect-type passive solar dryer

2017 ◽  
Author(s):  
Fatimah Batubara ◽  
Sari Farah Dina ◽  
Klaudia Kathryn Y. M. ◽  
M. Turmuzi ◽  
Fitri Siregar ◽  
...  
Keyword(s):  
Flat Plate ◽  
Thermal Efficiency ◽  
Solar Irradiance ◽  
Solar Dryer ◽  
Passive Solar

scholarly journals Thermal Efficiency of Natural Convection Solar Dryer

2017 ◽  
Vol 901 ◽  
pp. 012044 ◽  
Author(s):  
N Seetapong ◽  
S Chulok ◽  
P Khoonphunnarai
Keyword(s):  
Natural Convection ◽  
Thermal Efficiency ◽  
Solar Dryer

Investigation of fin geometries impact on thermal efficiency of solar dryer

2021 ◽  
Author(s):  
T. Maridurai ◽  
G. Ramesh ◽  
V. Manivelmuralidaran ◽  
A. Backiyaraj ◽  
T. Sathish ◽  
...  
Keyword(s):  
Thermal Efficiency ◽  
Solar Dryer

scholarly journals Thermal performance of novel indirect passive solar dryer

2021 ◽  
Vol 30 (2) ◽  
pp. 293-303
Author(s):  
Manar Al-Jethelah ◽  
Hussam Deyab ◽  
Tadahmun Yaseen
Keyword(s):  
Experimental Investigation ◽  
Free Convection ◽  
Thermal Performance ◽  
Thermal Efficiency ◽  
Solar Irradiation ◽  
The Novel ◽  
Solar Dryer ◽  
Passive Solar ◽  
Drying Chamber

An experimental investigation was conducted to study the performance of a novel indirect type free convection solar dryer. The novel and a conventional indirect passive solar dryer were built. Solar irradiation and temperature of different locations were recorded. The air at the drying chamber entrance, lower space, and upper space temperatures besides the thermal efficiency of the novel dryer were 68, 39, 49 and 85%, respectively, higher than the conventional one.

scholarly journals Performance Evaluation of a Forced Convection Mixed-Mode Solar Grain Dryer with a Preheater

2021 ◽  
Vol 10 (4) ◽  
pp. 41-51
Author(s):  
Johannes P. Angula ◽  
Freddie Inambao
Keyword(s):  
Forced Convection ◽  
Thermal Efficiency ◽  
Mixed Mode ◽  
Total Mass ◽  
Initial Moisture Content ◽  
Food Preservation ◽  
Drying Rate ◽  
Drying Time ◽  
Solar Dryer ◽  
Maize Cobs

In this study the performance of a forced convection mixed-mode solar grain dryer integrated with a preheater was evaluated. The type of grains used in the experiment were 72 freshly harvested maize cobs with a total mass of 17 kg. The experiment was conducted at various airflow speeds and preheater temperatures ranging from 0.5 m/s to 2 m/s and 30 ℃ to 40 ℃, respectively. The aim of the study was to improve the performance of an existing indirect solar dryer which was converted to a mixed-mode solar dryer. The initial thermal efficiency of the indirect solar dryer before modification was 36 %. The results from the experiment indicated a maximum thermal efficiency of 58.8 % with a corresponding drying rate of 0.0438 kg/hr. The minimum thermal efficiency for the mixed-mode solar grain dryer system was 47.7 %, with a corresponding drying rate of 0.0356 kg/hr. The fastest drying time of maize cobs was achieved in 4 hours and 34 minutes from an initial moisture content of 24.7 % wb to 12.5 % wb. The findings show a significant improvement in the dryer system's performance. This is a clear indication that operating a solar dryer system in mixed-mode operation with forced convection and the assistance of a preheater or backup heater can significantly improve drying processes and increase food preservation.

scholarly journals Experimental Evaluation of Thermals Performances of The Solar Dryer with Parabolic Trough Collector

2021 ◽  
pp. 1-9
Author(s):  
B. Magloire Pakouzou ◽  
N. Landry M'Bouana ◽  
M. S. Thierry Ky ◽  
Jean M'Boliguipa ◽  
D. Joseph Bathiébo
Keyword(s):  
Natural Convection ◽  
Surface Area ◽  
Thermal Efficiency ◽  
Experimental Evaluation ◽  
Focal Point ◽  
Large Surface Area ◽  
Thermal Converter ◽  
Parabolic Trough ◽  
Solar Dryer ◽  
Effective Performance

A cylindrical-parabolic solar-thermal converter, with 0.5m2 of capture surface, was manufactured and attached to a furnace, constituting an indirect solar dryer. Thermal balances of the elements of the receiver, housed in the focal point of this collector, are settled. A campaign of vacuum tests of this dryer indicated temperatures of the heat-bearing air in natural convection, along the absorber tube (70°C) and inside the drying cage (almost 60°C,on average). The average thermal efficiency of said converter has been evaluated at 50%.The higher the efficiency, the less the converter's capture surface is required and, therefore, less investment is required. These promising results testify to the effective performance of this new dryer compared to dryers with flat collectors, whose efficiencies could not exceed 40% despite the large surface area of these collectors.

scholarly journals Performance Analysis of Red Chilli in a Hybrid Collector with Solar Dryer

2021 ◽  
Vol 12 (2) ◽  
pp. 1794-1802
Author(s):  
E Murali, Et. al.
Keyword(s):  
Performance Analysis ◽  
Solar Radiation ◽  
Moisture Content ◽  
Thermal Efficiency ◽  
Removal Rate ◽  
Initial Moisture Content ◽  
Weight Basis ◽  
Moisture Removal ◽  
Drying Time ◽  
Solar Dryer

This article performed various analysis on Red chilli by hybrid collector with solar dryer (HCSD). This study was carried out forced convection solar dryer which performed better in all aspects such as drying time, moisture removal rate, electrical efficiency, electrical thermal efficiency, thermal efficiency and overall thermal efficiency. In general, solar radiation was provided a sources of generating energy to drive a solar dryer. Hybrid collector has been provided the electrical and thermal energy to run a solar dryer. The solar dryer was tested by drying 12 kg of red chilli in the drying air temperature in the range of 32 0C – 56 0C. The initial moisture content of the red chilli was 71.5 % (weight basis) and was reduced to the final moisture content of 16.2 % (weight basis) in 6 consistent days with clear sunny days. The HCSD was operated between 9 hrs to 16 hrs. Finally, comparative study was also handled for better understanding in HCSD, in which solar dryer drying made better outcome than open sun drying.

Sign in / Sign up

Export Citation Format

Share Document