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DESIGN AND DEVELOPMENT OF SOLAR TUNNEL DRYER WITH CONTROL SYSTEM FOR LARGE SCALE DRYING OF AGRO PRODUCTS
G. SARAVANAPRIYA, R. MAHENDIRAN

Published in: International Journal of Agriculture Sciences
Volume- 9, Issue-40, pp.4626-4631, Aug 2017
DPI :-> 16.10077.IJAS.2017.V9I40.46264631.2008



Abstract
Drying of agro products is one of the most important post harvest operations in agricultural processing. This paper presents the design. Development and experimental investigations of solar tunnel dryer with control system for drying agro product (coconuts). The experiments were conducted in a hemispherical shaped solar tunnel dryer for drying coconuts and compared with open sun drying. The weather parameters such as ambient temperature and ambient RH, wind velocity, wind direction, solar radiation and rainfall were monitored along with dryer temperature and relative humidity. The dryer temperature and relative humidity was monitored and controlled with control system using exhaust fans at chimneys. The coconuts were loaded in a tray and trolley system inside the dryer and drying experiments were performed between 9.00 a.m. to 5.00 p.m. It was found that the time required to dry coconuts from initial moisture content of 110.5 per cent (d.b) to a final moisture content of around 7.36 per cent (d.b) in solar tunnel drying mode was 49.5 hours, whereas 80 hours for open sun drying mode. The drying characteristics such as moisture reduction, drying rate and moisture ratio were analyzed.

Key-Words / Index Term
Coconuts, Solar Tunnel Dryer, Moisture, Drying Rate, Automatic Control System

How to cite this article
G. SARAVANAPRIYA, R. MAHENDIRAN , “DESIGN AND DEVELOPMENT OF SOLAR TUNNEL DRYER WITH CONTROL SYSTEM FOR LARGE SCALE DRYING OF AGRO PRODUCTS”, International Journal of Agriculture Sciences, 9, Issue-40, pp.4626-4631, Aug 2017. DPI:16.10077.IJAS.V9.I40.2008