Journal of Agricultural Science and Technology
Journal of Agricultural Science and Technology
JAST
Agriculture
http://jast.modares.ac.ir
1
admin
1680-7073
2345-3737
10.22034/jast
en
jalali
1392
10
1
gregorian
2014
1
1
16
1
online
1
fulltext
en
Drying Kinetics and Quality Characteristics of Saffron Dried with a Heat Pump Assisted Hybrid Photovoltaic-thermal Solar Dryer
In the present study, saffron was dried using a heat pump-assisted hybrid photovoltaic-thermal solar dryer. The effect of different drying air temperatures at three levels (40, 50, and 60<sup>o</sup>C) and two different modes of the dryer (with and without heat pump system) were investigated on drying behaviour of saffron. After collecting the pertinent data, eleven drying models were used to describe drying characteristics of saffron. Quality characteristics of the dried products (including: colouring, aromatic strength and bitterness) were also evaluated. The results indicated that drying time decreased by 62% with increasing air temperature from 40 to 60<sup>o</sup>C. Moreover, applying heat pump with the dryer reduced RH of drying air and, consequently, enhanced drying rate and shortened drying period by 40%. A two-term drying model presented a relatively higher <em>R<sup>2</sup></em> and lower, <em>MBE</em>, and <em>RMSE</em> values at both modes of drying and, therefore, was selected to explain drying behaviour of saffron among the other models. The results of saffron quality evaluation showed that colouring characteristics of saffron improved with drying temperature and heat pump system. Meanwhile, aromatic strength of saffron increased with increasing air temperature. But, no significant change in bitterness was observed at different levels of temperature and heat pump system.
PV-T dryer,Mathematical modelling,Quality drying,Two-term model
33
45
http://jast.modares.ac.ir/browse.php?a_code=A-23-11598-17&slc_lang=en&sid=23
H.
Mortezapour
H.
Mortezapour
100319475328460050255
100319475328460050255
No
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
B.
Ghobadian
B.
Ghobadian
100319475328460050250
100319475328460050250
Yes
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
M. H.
Khoshtaghaza
M. H.
Khoshtaghaza
100319475328460050249
100319475328460050249
No
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
S.
Minaei
S.
Minaei
100319475328460050248
100319475328460050248
No
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.
Department of Mechanics of Agricultural Machinery, Faculty of Agriculture, Tarbiat Modares University, Islamic Republic of Iran.