Research Papers

Modeling and Experimental Studies on Oscillating Inclined-Bed Solar Dryer

[+] Author and Article Information
S. Shanmugam

e-mail: shunt@nitt.edu

AR. Veerappan

Department of Mechanical Engineering,
National Institute of Technology,
Tiruchirappalli 620015, India

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received November 24, 2011; final manuscript received September 3, 2012; published online April 29, 2013. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 135(3), 031009 (Apr 29, 2013) (6 pages) Paper No: SOL-11-1254; doi: 10.1115/1.4023592 History: Received November 24, 2011; Revised September 03, 2012

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.

Copyright © 2013 by ASME
Your Session has timed out. Please sign back in to continue.



Grahic Jump Location
Fig. 1

Schematic representation of the produce layer in the oscillating bed solar dryer

Grahic Jump Location
Fig. 2

Flow diagram of the drying process for agricultural produce

Grahic Jump Location
Fig. 3

A view of the solar dryer

Grahic Jump Location
Fig. 4

Variation in the solar insolation and power consumed by the blower and bed motor over the course of a day

Grahic Jump Location
Fig. 5

Dependence of the moisture content of dried seeds on the resident time at different temperatures and relative humidities

Grahic Jump Location
Fig. 6

Comparison of the humidity between the experimental and predicted results at different resident times

Grahic Jump Location
Fig. 7

Comparison between the experimental and predicted results of the exit temperature of air from the bed with respect to the layer thickness of the seeds

Grahic Jump Location
Fig. 8

Comparison between the predicted and experimental results for the mass of seeds collected

Grahic Jump Location
Fig. 9

Thermal efficiency of the dryer for the drying of sunflower seeds with different layer thicknesses at a constant temperature and relative humidity

Grahic Jump Location
Fig. 10

Graphical representation of seeds drying on a psychrometric chart




Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In