The development of a drum dryer using the infrared technique in okara powder | |
| Author | Nahathai Puntigo |
| Call Number | AIT Thesis no.FB-06-07 |
| Subject(s) | Okara Infrared heating |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. FB-06-07 |
| Abstract | An infrared assisted drum dryer was developed for okara. Okara was dried at three radiation intensities of infrared heater to obtain drum surface temperatures of about 130, 150 and 170 °c at three rotational speeds at 0.5, 1.0 and 1.5 rpm. Performance of infrared assisted drum dryer was compared with that of traditional drum dryer in terms of operational efficiency and properties of dried okara. The results showed that the rates of drying were higher in case of infrared assisted drum dryer as compared to the drum dryer. Drying rates of okara varied linearly with both radiation intensity of infrared lamp and rotational speed of the drum. The density, water solubility and protein content of dried okara powder did not change due to variations in the infrared assisted drum drying conditions. Water absorption decreased as heat treatment employed to the okara powder during drying increased while it increased with the increased of the rotational speed of the drum. The L (lightness) value of dried okara powder increased with increased rotational speed of the drum and decreased with increased radiation intensity. The a (redness) and b (yellowness) value increased as radiation intensity increased and decreased with increased rotational speed of the drum. When the infrared heating was used as additional heating source, the energy consumption slightly increased about 19.78 % and 5.40 % at 0.5 and 1.0 rpm and decreased about 10.40 % for 1.5 rpm as compared to the drum dryer. Increasing infrared radiation level did not affect the energy consumption. The result showed that steam drum dryer assisted with six infrared lamps having intensity of 170°C at 1.5 rpm offered the best condition because it decreased the drying time more than 40.71 % and increased the production rate more than 68.67% as compared to the drum dryer. |
| Year | 2006 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. FB-06-07 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Food Engineering and Bioprocess Technology (FB) |
| Chairperson(s) | Athapol Noornhorm |
| Examination Committee(s) | Rakshit, Sudip Kumar; Salokhe, Vilas M. |
| Scholarship Donor(s) | Royal Thai Government (Fellowship) |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2006 |