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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
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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
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The process in a mill is frequently monitored with the assistance of lists of measurement values and alarms from the process. Much time and concentration is sometimes needed to interpret these lists. If the process is described using a model the interpretation can be made automatically by a computer. This would unload the operator and permit the concentration of the operator to be focused on runni
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Hydro power stations are normally controlled by PID-controllers. One example is the Torsebro hydro power plant in Helge river. The Southern Sweden Power Supply (Sydkraft SB) initiated a research project addressing the water level control problem of hydro power plants.
The goal of this master thesis was to investigate the level-control problem. Different control structures were analyzed li