| Author | Srianong Kitsummanangkoon |
| Call Number | AIT Thesis no. AE-81-11 |
| Subject(s) | Solar energy research
|
| Note | A thesis submitted in partial fulfilment of the requirements for the degree of Master of Science, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | A solar rice dryer having 10.5 m2 mat area and 31.5 m2 collector area was tested for fish drying at the Asian Institute of Technology, Bangkok during December 1980 and April 1981.
The solar dryer was modified to provide different drying conditions i.e., normal operation (N); one third part of collector covered by black plastic sheet ((l/3)CCB); drying chamber covered by black plastic sheet (DC) and all air inlets closed by black plastic sheet (AIC). Air temperature of AIC mode was highest and followed by N, (l/3)CCB, and DC. However, the relative humidity of AIC mode was slightly higher than in N mode resulting from all air
inlets being closed by a black plastic sheet. This problem was solved by a holed-flap black plastic sheet which reduced the relative humidity. Each configurations (N, DC, and AIC) was tested for fish drying using
Tilapia nilotica. Dried-salted fish from N configuration was the best based on the appearance and drying time. A comparison of each modification was made
with sun drying based on the appearance, chemical quality, drying rate, and shelf life for improving the quality of traditional dried-salted fish drying. Drying rates of AIC and N were nearly same and higher than sun drying. Drying rate
of DC was lower than sun drying. Moreover the fish could be dried in the dryer under cloudy condition (N+C) at the same rate as they were dried in the open air under clear sky, S(N). The appearance of fish from solar dryer was better
in all configurations except in DC mode than in sun drying. Therefore, in using this type of dryer for fish, it was necessary for the top to be clear so that
the fish dried in combined mode. On the other hand, the increased air temperature in AIC mode caused cooking of fish during its drying process. If the cooking was not required, air should be allowed to flow freely into air
inlets. The percent NPN-TN of sun dried and solar dried fish was nearly the same. In terms of the rancidity, the storage life of solar dried fish appeared to be lower. However, the insect infestation during the fish drying on open mats had a marked influence on the fish appearance during the storage period. |
| Year | 1981 |
| Type | Thesis |
| School | School of Environment, Resources, and Development |
| Department | Department of Food, Agriculture and Natural Resources (Former title: Department of Food Agriculture, and BioResources (DFAB)) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Jindal, Vinod Kumar ; Edwards, Peter
|
| Examination Committee(s) | Exell, Robert H.B.
|
| Scholarship Donor(s) | The Australian Government |
| Degree | Thesis (M.Sc.) - Asian Institute of Technology, 1981 |