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.

References

References
1.
Bakker-Arkema
,
F. W.
,
Lerew
,
L. E.
,
De Boer
,
S. F.
, and
Roth
,
M. C.
,
1974
, “
Grain Dryer Simulation
,” Research Report 224, Agricultural Experiment Station, Michigan State University, East Lansing, MI.
2.
Sokhansanj
,
S.
, and
Wood
,
H. C.
,
1991
, “
Simulation of Thermal and Disinfestations Characteristics of Forage Dryer
,”
Drying Technol.
,
9
(
3
), pp.
643
656
.10.1080/07373939108916701
3.
Brokker
,
O. B.
,
Bakker-Arkema
,
F. W.
, and
Hall
,
C. W.
,
1992
,
Drying and Storage of Grains and Oil Seed
,
AVI
,
New York
, p.
405
.
4.
Fasina
,
O.
, and
Sokhansang
,
S.
,
2001
, “
Modelling the Bulk Cooling of Alfalfa Pellets
,”
Drying Technol.
,
13
, pp.
1881
1904
.10.1080/07373939508917055
5.
Barrozo
,
M. A. S.
,
Sartori
,
D. J. M.
, and
Freire
,
J. T.
,
1996
, “
Simultaneous Heat and Mass Transfer During the Drying of the Soybeans Seeds in a Cross Flow Moving Bed
,”
Proceedings of the 10th International Drying Symposium (IDS'96)
,
Krakow, Poland
, July 30-August 2, pp.
873
880
.
6.
Motta-Lima
,
O. C.
,
Pinto
,
J. C.
, and
Massarani
,
G.
,
1996
, “
Parameter Estimation in Cross-Flow Sliding Bed Drying
,”
Proceedings of the 10th International Drying Symposium (IDS)
,
Krakow, Poland
, July 30-August 2, pp.
283
290
.
7.
Liu
,
Q.
, and
Bakker-Arkema
,
F. W.
,
2001
, “
Automatic Control of Cross Flow Dryers—Part 1: Development of Process Model
,”
J. Agric. Eng. Res.
,
80
(
1
), pp.
81
86
.10.1006/jaer.2001.0670
8.
Ghaly
,
T. F.
, and
Sutherland
,
J. W.
,
1983
, “
Quality Aspects of Heated-Air Drying of Soyabeans
,”
J. Stored Prod. Res.
,
19
(
1
), pp.
31
41
.10.1016/0022-474X(83)90022-X
9.
Izadifar
,
M.
, and
Mowla
,
D.
,
2003
, “
Simulation of a Cross-Flow Continuous Fluidized Bed Dryer for Paddy Rice
,”
J. Food Eng.
,
58
(
4
), pp.
325
329
.10.1016/S0260-8774(02)00395-3
10.
Bal
,
L. M.
,
Satya
,
S.
,
Naik
,
S. N.
, and
Meda
,
V.
,
2011
, “
Review of Solar Dryer With Latent Heat Storage Systems for Agricultural Products
,”
Renewable Sustainable Energy Rev.
,
15
(
1
), pp.
876
880
.10.1016/j.rser.2010.09.006
11.
Gupta
,
K. R.
, and
Das
,
S. K.
,
1997
, “
Physical Properties of Sunflower Seeds
,”
J. Agric. Eng. Res.
,
66
(
1
), pp.
1
8
.10.1006/jaer.1996.0111
12.
Forson
,
F. K.
,
Nazha
,
M. A. A.
, and
Rajakaruna
,
H.
,
2007
, “
Modelling and Experimental Studies on a Mixed-Mode Natural Convection Solar Crop Dryer
,”
Sol. Energy
,
81
(
3
), pp.
346
357
.10.1016/j.solener.2006.07.002
13.
Henderson
,
S. M.
,
1952
, “
A Basic Concept of Equilibrium Moisture
,”
Agric. Eng.
,
33
, pp.
29
32
.
14.
Mumba
,
J.
,
1996
, “
Design and Development of a Solar Grain Dryer Incorporating Photovoltaic Powered Air Circulation
,”
Energy Convers. Manage.
,
37
(
5
), pp.
615
621
.10.1016/0196-8904(95)00205-7
15.
Maiti
,
S.
,
Patel
,
P.
,
Vyas
,
K.
,
Eswaran
,
K.
, and
Ghosh
,
P. K.
,
2011
, “
Performance Evaluation of a Small Scale Indirect Solar Dryer With Static Reflectors During Non-Summer Months in the Saurashtra Region of Western India
,”
Sol. Energy
,
85
(
11
), pp.
2686
2696
.10.1016/j.solener.2011.08.007
You do not currently have access to this content.