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For efficient firing in sloping grate bark ovens, it is important to control the ash line position on the grate. Here, the problem of detecting the ash line with an image processing system is treated. The presentation of trend curves to the operator is of special interest. The trend curves shall indicate how the ash line position changes with time, and in that way improve the manual control of the
This is a presentation of automatic control theory in combination with an introduction to the digital controller Asea Novatune. The work is done as part of a master degree in science at Lund Institute of Technology, Department of Automatic Control, with Asea Innovation, Västerås, as sponsoring organization. The presentation is to be used within Asea Innovation for education. The presentation has
Design and operation of industrial freezers contains the crucial problem of how to make the frozen foods attain a prescribed temperature. Methods for prediction of freezing times under given constant conditions are commonly used in order to calculate the optimum product flow through continuous freezers. However, in reality the processes are time variable, due to disturbances and parameter deviatio
This master thesis develops and tests models for simulation of district heating networks. Starting with an example of a thermodynamical system, methods were developed to describe the system with modules. Three elementary modules have been defined: R-, E- and C-module. (R=resistance, E=energy transport element, C=capacitor) More complicated components, such as boilers and heat exchangers, can be vi
