Modeling of Drying Process and Energy Consumption of Onion (Ex-gidankwanoSpp.) Slices in a Hybrid Crop Dryer
Journal Title: American journal of Engineering Research - Year 2017, Vol 6, Issue 1
Abstract
High consumption of energy in the drying industry has prompted extensive research regarding various aspects of crop drying energy consumption. Specific energy consumption, moisture ratio and thermal efficiency in drying of fresh ex-gidankwano onions variety were determined using a hybrid electric-gas dryer at air temperatures of 50, 60 and 70oC, and at air velocities of 0.5, 1.0 and 1.5m/s. Thin layer models were selected by carrying out statistical analyses to fit the drying rate data to themodels. The Page drying model was found more suitable to describe the drying behaviour of onions slices based on its highest average R2 -values of 0.99 and lowest average RMSE of 3.91for all temperatures and air velocitiesirrespective of the heat source. Records of drying rates and energy consumption were made using electronic weighing balances and the Arduino microprocessor respectively. Results obtained show that the specific energy consumption decreases with increase in air temperature but increases with increase in air velocity in both heat sources. The minimum and maximum specific energies for the electric and gas heat sources were 48.73MJ/kg and 90.21MJ/kg, and 36.83MJ/kg and64.65MJ/kg of moisture evaporated respectively.The thermal efficiency of the heat sources increased proportionally with increasing drying air temperature and decreased with increase in drying air velocity with maximum values of 54.8% and 68.2% for the electric and gas heaters respectively. The gas heat source performed more efficiently in terms of energy consumption and thermal efficiency at different temperatures and air velocities.
Authors and Affiliations
N. R. Nwakuba1, O. C. Chukwuezie, L. C. Osuchukwu
Keywords
Related Articles
- EP ID EP399602
- DOI -
- Views 79
- Downloads 0
Design Improvement Study For cBN Coated Cutting Body Used In Piston Ring Cutting Process
In this study, the quality of non-alloy, non-heat treated, gray cast iron workpieces with lamellar graphite was compared with the cutter body with cubic boron nitride (cBN) coated with different hot work steel tool desig...
A Survey of Web Search from Web Documents Based On Semantic Ontology Technique
There exists a gap between Web mining and the effectiveness of using Web data. The main reason is that we cannot simply utilize and maintain the discovered knowledge using the traditional knowledge-based techniques due t...
Improving the Quality of Customer Service System at Sharia Bank using SERVQUAL and Six Sigma Methods
Customer satisfaction is a main factor important to Islamic banking in its effort to improve service quality. Customers expect the Bank Syariah Wilayah Jakarta Timur to have good service quality, yet customers perceived...
PVC Coated Glass Fiber Reinforced Composite Filament Material Production And Investigation Of The Mechanical Properties
In this work, the glass fiber filament was coated with PVC at the extruder in filament form. The filament material produced was woven with a weaving loom then pressed at 165 °C and 2.5MPa of pressure. In order to determi...
Methods for Determining Oxygen Overvoltage and Anode Poisoning Over Time at Iron-Group Metals under High Current Densities in Alkaline Water Electrolysis
Determination of oxygen overvoltage (s) is complicated by high current densities under alkaline water electrolysis. Therefore, it is desirable to develop method for advanced control of oxygen overvoltage. Here, we show...