Advantages And Disadvantages Of Solar Drying

Disadvantages: 1) Damage to the crop by rodents, birds, and animals. 2) Degradation through exposure to direct irradiation of the sun and to rain, storm, and dew.3) Contamination by dirt dust, wind-blown debris, and environmental pollution, 4) loss due to over drying 5) Insect infestation Growth of microorganisms.6) Additional losses during storage due to insufficient or no uniform drying
3.2 Control Drying- Control drying using Solar Dryer
3.2.1 Direct type solar dryers- In the direct type of solar dryer, solar radiation passes through a transparent cover, usually glass, to be incident on the grapes placed for drying. The glass cover reduces direct convective losses to the surroundings and increases temperature inside the dryer
i. Box Type or Solar cabinet dryer ii. Staircase solar dryer iii. Glass roof solar dryer
Advantages: The advantages of solar drying over open sun drying are, 1) Contamination of product due to enclosure with transparent cover is less. 2) Offer protection from rains, dews, debris etc. 3) Product quality obtained is higher than open to the sun drying. 4) Simpler and cheaper to construct than the …show more content…
3)Better control over drying and better product quality than sun drying.4)Possibility of eliminating fan/blower using a heating media to heat the product being dried and passing drying air over it because moisture pickup per kg dry air is much higher. 5) Air circulation aided by draft due to the chimney multiple trays to hold the material being dried. 6) Better than other dryers in terms of solving various equation based on energy . 7)better performance than other conventional type of dryer unit of drying. 8) Heat damage do not occur as the crops are protected and opaque to direct radiation. 9) Specially recommended for photo-sensitive Material. 10) Greater efficiency than direct solar