Post-harvest drying kinetics of okra (Abelmoschus Esculentus) under greenhouse drying and heat pump drying
Abstract
Drying is carried out to prolong the shelf life of food products to reduce
post-harvest losses by reducing the moisture content present in it. Thin layer drying
kinetics of okra (Abelmoschus esculentus) has been compared with open sun drying, heat
pump drying and greenhouse drying with different glazing material such as UV
Polyethylene sheet and drip lock sheet under passive and active modes. The experimental
results showed that the reduction in moisture content of okra from 87.65 % to 10% was
achieved in 16 hours under open sun drying (OSD), 14 hours using UV polyethylene
sheet greenhouse dryer under passive mode (UVPM), 13 hours under drip lock sheet
greenhouse dryer under passive mode (DLPM) and in UV polyethylene sheet greenhouse
dryer under active mode (UVAM), 12 hours to achieve the moisture content of 9.3 %
using drip lock sheet greenhouse dryer under active mode (DLAM) and 8 hours in heat
pump drying (HPD). The highest dryer efficiency of 38.78% was achieve...d under HPD
and 14.15% was achieved under DLAM greenhouse drying. Higher effective moisture
diffusivity value of 2.09 x 10-10 m
2
/s was achieved in HPD compared to other modes and
lower effective moisture diffusivity of 1.04 x 10-10 m
2
/s was achieved under open sun
drying mode in drying okra. Heat Pump dryer had a higher Specific Moisture Extraction
Rate (SMER) value of 2.60 kg/ kWh compared to other methods of drying. It was found
that the products dried with minimum drying time in HPD compared to greenhouse
drying but still in the economic point of view greenhouse drying has low cost.
Keywords:
Active mode / Drying kinetics / Effective moisture diffusivity / Greenhouse dring / Heat pump drying / Passive modeSource:
The Fifth International Symposium on Agricultural Engineering - ISAE-2021, Proceedings, 2021, III-97-III-108Publisher:
- University of Belgrade, Faculty of Agriculture, The Institute for Agricultural Engineering
Collections
Institution/Community
Mašinski fakultetTY - JOUR AU - Sekar, Subramani D AU - Sekar, S AU - Zlatanović, Ivan PY - 2021 UR - https://machinery.mas.bg.ac.rs/handle/123456789/5038 AB - Drying is carried out to prolong the shelf life of food products to reduce post-harvest losses by reducing the moisture content present in it. Thin layer drying kinetics of okra (Abelmoschus esculentus) has been compared with open sun drying, heat pump drying and greenhouse drying with different glazing material such as UV Polyethylene sheet and drip lock sheet under passive and active modes. The experimental results showed that the reduction in moisture content of okra from 87.65 % to 10% was achieved in 16 hours under open sun drying (OSD), 14 hours using UV polyethylene sheet greenhouse dryer under passive mode (UVPM), 13 hours under drip lock sheet greenhouse dryer under passive mode (DLPM) and in UV polyethylene sheet greenhouse dryer under active mode (UVAM), 12 hours to achieve the moisture content of 9.3 % using drip lock sheet greenhouse dryer under active mode (DLAM) and 8 hours in heat pump drying (HPD). The highest dryer efficiency of 38.78% was achieved under HPD and 14.15% was achieved under DLAM greenhouse drying. Higher effective moisture diffusivity value of 2.09 x 10-10 m 2 /s was achieved in HPD compared to other modes and lower effective moisture diffusivity of 1.04 x 10-10 m 2 /s was achieved under open sun drying mode in drying okra. Heat Pump dryer had a higher Specific Moisture Extraction Rate (SMER) value of 2.60 kg/ kWh compared to other methods of drying. It was found that the products dried with minimum drying time in HPD compared to greenhouse drying but still in the economic point of view greenhouse drying has low cost. PB - University of Belgrade, Faculty of Agriculture, The Institute for Agricultural Engineering T2 - The Fifth International Symposium on Agricultural Engineering - ISAE-2021, Proceedings T1 - Post-harvest drying kinetics of okra (Abelmoschus Esculentus) under greenhouse drying and heat pump drying EP - III-108 SP - III-97 UR - https://hdl.handle.net/21.15107/rcub_machinery_5038 ER -
@article{ author = "Sekar, Subramani D and Sekar, S and Zlatanović, Ivan", year = "2021", abstract = "Drying is carried out to prolong the shelf life of food products to reduce post-harvest losses by reducing the moisture content present in it. Thin layer drying kinetics of okra (Abelmoschus esculentus) has been compared with open sun drying, heat pump drying and greenhouse drying with different glazing material such as UV Polyethylene sheet and drip lock sheet under passive and active modes. The experimental results showed that the reduction in moisture content of okra from 87.65 % to 10% was achieved in 16 hours under open sun drying (OSD), 14 hours using UV polyethylene sheet greenhouse dryer under passive mode (UVPM), 13 hours under drip lock sheet greenhouse dryer under passive mode (DLPM) and in UV polyethylene sheet greenhouse dryer under active mode (UVAM), 12 hours to achieve the moisture content of 9.3 % using drip lock sheet greenhouse dryer under active mode (DLAM) and 8 hours in heat pump drying (HPD). The highest dryer efficiency of 38.78% was achieved under HPD and 14.15% was achieved under DLAM greenhouse drying. Higher effective moisture diffusivity value of 2.09 x 10-10 m 2 /s was achieved in HPD compared to other modes and lower effective moisture diffusivity of 1.04 x 10-10 m 2 /s was achieved under open sun drying mode in drying okra. Heat Pump dryer had a higher Specific Moisture Extraction Rate (SMER) value of 2.60 kg/ kWh compared to other methods of drying. It was found that the products dried with minimum drying time in HPD compared to greenhouse drying but still in the economic point of view greenhouse drying has low cost.", publisher = "University of Belgrade, Faculty of Agriculture, The Institute for Agricultural Engineering", journal = "The Fifth International Symposium on Agricultural Engineering - ISAE-2021, Proceedings", title = "Post-harvest drying kinetics of okra (Abelmoschus Esculentus) under greenhouse drying and heat pump drying", pages = "III-108-III-97", url = "https://hdl.handle.net/21.15107/rcub_machinery_5038" }
Sekar, S. D., Sekar, S.,& Zlatanović, I.. (2021). Post-harvest drying kinetics of okra (Abelmoschus Esculentus) under greenhouse drying and heat pump drying. in The Fifth International Symposium on Agricultural Engineering - ISAE-2021, Proceedings University of Belgrade, Faculty of Agriculture, The Institute for Agricultural Engineering., III-97-III-108. https://hdl.handle.net/21.15107/rcub_machinery_5038
Sekar SD, Sekar S, Zlatanović I. Post-harvest drying kinetics of okra (Abelmoschus Esculentus) under greenhouse drying and heat pump drying. in The Fifth International Symposium on Agricultural Engineering - ISAE-2021, Proceedings. 2021;:III-97-III-108. https://hdl.handle.net/21.15107/rcub_machinery_5038 .
Sekar, Subramani D, Sekar, S, Zlatanović, Ivan, "Post-harvest drying kinetics of okra (Abelmoschus Esculentus) under greenhouse drying and heat pump drying" in The Fifth International Symposium on Agricultural Engineering - ISAE-2021, Proceedings (2021):III-97-III-108, https://hdl.handle.net/21.15107/rcub_machinery_5038 .