Mathematical modelling of agricultural drying systems

Professorial Chair Lecture

Diamond Jubilee Professorial Chair for Assistant Professor of Agricultural Engineering

Place

Agricultural and Bio-Process Division Institute of Agricultural Engineering College of Engineering and Agro Industrial Technology UPLB, College Laguna

Date

8-22-2002

Abstract

Mathematical models for various types of agricultural dryers for use in the country have been developed. The following dryer types have been considered: (I) direct solar dryer; (2) indirect solar dryer: (3) flatbed dryer; and (4) natural convection pit dryer. Open sundrying was also evaluated. The models have been developed to provide an understanding of the flow phenomena. temperature. heat and mass fluxes in the dryers and to provide a method for the systematic design, development and evaluation of such agricultural dryers. the results obtained from the models indicate that drying rates m open sundrying and in the direct solar dryer are affected by the amount of solar radiation received, the crop bed thickness and the type of crop being dried. The study of indirect solar dryer indicated that the air flow through the bed and the temperature of the crop were uniform for the conditions considered. Thenatural convection flow pit dryer model indicated that the dominant factors affecting the drying rate are the heat exchanger temperature and the dept of the crop the distance between the crop bed and the heat exchanger has a weak effect on the total heat flow to the crop and radiative heat transfer contributes 2.1 of the total heat flux to the crop. From the CFO analysis of the l Flatbed dryer. it was concluded that increasing grain depth increases momentum resistance against drying airflow from the plenum. Also, flatbed dryer configuration should have length's...kith greater than I.

Location

UPLB Main Library Special Collections Section

Call Number

Sp. Col.

Pages/Collation

26 leaves

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