Evaluation of performance and energy consumption of a flash dryer for coconut residue | |
| Author | Phensiri Khongsit |
| Call Number | AIT Thesis no.FB-12-10 |
| Subject(s) | Coconut--Drying Fluidization |
| Note | A thesis submitted in partial fulfillment of the requirements for the ” degree of Master of Engineering in Food Engineering and Bioprocess Technology, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. no.FB-12-10 |
| Abstract | The objective of the study was investigating an effect from drying conditions to the dried coconut residue quality, evaluating the energy consumption and performance of flash drying. There were two drying methods, namely fluidized bed drying and flash drying. Fluidized bed drying was performed at difference drying tempera ture (130 °C, 140 °C, 150°C and 160 °C) at constant air velocity 0.7 m/s. The coconut residue was dried from 59% wet basis to 10% at drying time 120 - 155 second. Seven thin layer drying models (Newton or Lewis, Page , Henderson and Pabis, Logarithmic, Two te rm s , Two terms exponential and Midilli model ) were fitted for experimented data. The Page model was found as the best model to predict drying behavior of dried coconut. Flash dryer was performed at different air velocity (17.7, 18.2, 19.9 and 21 m /s) and drying temperature (160 , 170, 180 and 190 °C) at constant feed rate 0.0010517 kg/s. The drying temperature at 170 °C with 18.2 m/s air velocity was found the most appropriate condition to dry the coconut residue with the least moisture content (10% w . b . ). The effect from air velocity and drying temperature to the drying rate was found to be the linear regression. The terminal velocity of coconut residue was 1.96 m/s. The specific heat of coconut residue was determined by differential scanning calorimeter (D SC) raised from 1.81 to 4.67 kJ / kg °C at temperature 25 to 80 °C and moisture content 0.51 to 61.91 % wet basis. The relationship between the specific heat, moisture content and temperature was linear. The performance of flash drying was evaluated in term of mass and heat transfer. The coconut residue was los t from flash dryer at cyclone about 19.9% dry solid. The efficiency of flash dryer was range 5.37 – 7.57 % with drying temperature 160 - 190 °C and air velocity ( 17.7, 18.2, 19.9 and 21 m/s) . T he specific energy consumption was increased from 19.40 to 28.26 MJ/kg water with increase drying temperature and air velocity. The effect from drying temperature and air velocity to the specific energy consumption was found to be the linear regression. |
| Year | 2012 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. no.FB-12-10 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Food Engineering and Bioprocess Technology (FB) |
| Chairperson(s) | Athapol Noomhorm; |
| Examination Committee(s) | Rakshit, Sudip Kumar;Anal, Anil Kumar;Rittichai Asswarachan; |
| Scholarship Donor(s) | Royal Thai Government Fellowship |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2012 |