Design of a solar dryer for agricultural products to conserve the environment
KHALIL SAYED KHALIL;
Abstract
The aim of this study is to design and evaluate some cabinet solar dryers to utilize solar energy with optimum efficiency for drying grain products of rice crop, to keep the environment free from pollution and save fossil fuel.
Five types of solar dryers were constructed and elaborated:
1- Tent dryer.
2- Natural-convection dryer.
3- Dryer with air forced under tray.
4- Dryer with circulated air.
5- Forced air dryer with additional collector.
The hot-air temperatures in the loaded cabinet ranged between 39 and 48 oc
according to type of dryer and environmental conditions (Oct. 1998, from 9 AM. to 4
PM.).
Without cabinet load, the temperatures ranged between 46 and 56 °C. The highest temperatures corresponded to the natural-convection dryer, while the lowest corresponded to dryer of tent and forced-air with additional collector.
The study includes details of the following variables, within conditions of experiments :
• Relative humidities inside the cabinet of air-forced dryer ranged between 25-
84%.
• The inlet air velocities were 0.17-1.00 m/s.
• Moisture content experiments of rice grain decreased to min. of 11.9 % by the forced-air tray dryer.
• Cracking ratio 1.0 - 2.0 % according to drying coefficient and rate of grain moisture-removal.
• Thermal efficiencies 4.6- 64.2 %. The lowest obtained from natural-convection dryer, and the highest from forced-air dryer with additional solar collector.
• The drying costs of air-forced under tray dryer (01), circulated air-forced dryer
(02), air-forced dryer with additional collector (03), natural-convection dryer (04),
Five types of solar dryers were constructed and elaborated:
1- Tent dryer.
2- Natural-convection dryer.
3- Dryer with air forced under tray.
4- Dryer with circulated air.
5- Forced air dryer with additional collector.
The hot-air temperatures in the loaded cabinet ranged between 39 and 48 oc
according to type of dryer and environmental conditions (Oct. 1998, from 9 AM. to 4
PM.).
Without cabinet load, the temperatures ranged between 46 and 56 °C. The highest temperatures corresponded to the natural-convection dryer, while the lowest corresponded to dryer of tent and forced-air with additional collector.
The study includes details of the following variables, within conditions of experiments :
• Relative humidities inside the cabinet of air-forced dryer ranged between 25-
84%.
• The inlet air velocities were 0.17-1.00 m/s.
• Moisture content experiments of rice grain decreased to min. of 11.9 % by the forced-air tray dryer.
• Cracking ratio 1.0 - 2.0 % according to drying coefficient and rate of grain moisture-removal.
• Thermal efficiencies 4.6- 64.2 %. The lowest obtained from natural-convection dryer, and the highest from forced-air dryer with additional solar collector.
• The drying costs of air-forced under tray dryer (01), circulated air-forced dryer
(02), air-forced dryer with additional collector (03), natural-convection dryer (04),
Other data
| Title | Design of a solar dryer for agricultural products to conserve the environment | Other Titles | تصميم مجفف شمسى لتجفيف المنتجات الزراعية للحفاظ على البيئة | Authors | KHALIL SAYED KHALIL | Issue Date | 2002 |
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