Block oriented modeling of drying processes. (English) Zbl 0859.65134
Summary: Block oriented system simulation based on physical model was used to simulate the drying process of different agricultural materials instead of uncertain empirical and half-empirical equations. The main purpose of this paper is to demonstrate the advantages of this method and to show how to build up a general library with several components which can help to simulate a randomly structured dryer. A well defined and known model is used as a basis. This model is solved originally with the help of a numerical method and neglecting some dynamical changes, but it is now solved by a block oriented method.
It is found that block oriented approaches have advantages compared to other methods. In many cases using physically based modeling means to solve several differential equations. Solving of these equations sometimes is impossible with traditional methods, but it is very simple with the help of this technique and creating new blocks during the work which help further developments. A fixed bed drying model is solved in a block oriented system consisting of air and grain moisture and temperature distributions. Finally, the moisture distribution of layers and a comparison with other models are performed.
It is found that block oriented approaches have advantages compared to other methods. In many cases using physically based modeling means to solve several differential equations. Solving of these equations sometimes is impossible with traditional methods, but it is very simple with the help of this technique and creating new blocks during the work which help further developments. A fixed bed drying model is solved in a block oriented system consisting of air and grain moisture and temperature distributions. Finally, the moisture distribution of layers and a comparison with other models are performed.
MSC:
| 65Z05 | Applications to the sciences |
| 80A20 | Heat and mass transfer, heat flow (MSC2010) |
| 35Q80 | Applications of PDE in areas other than physics (MSC2000) |
| 92C05 | Biophysics |
Keywords:
agricultural engineering; block oriented system simulation; drying process of agricultural materials; randomly structured dryer; differential equations; fixed bed dryingReferences:
| [1] | Bakker-Arkema, F. W.; Lerew, L. E.; De Boer, S. F.; Roth, M. G.: Grain dryer simulation. Research report (1974) |
| [2] | Boxtel, A. J. B.; Farkas, I.; Lukasse, L.; Rendik, Z.: Physically based modelling and optimal operation for product drying during post-harvest processing. Proc. 2nd IFAC-ISHS internat. Workshop, silsoe, UK (1994) |
| [3] | Farkas, I.: Modeling and identification of agricultural driers. Proc. 11th IFAC world cong., tallin, Estonia, USSR 12, 4-8 (1990) |
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