Fuzzy Temperature Control Programs for the Precision Water Bath of the Heat Exchange Calorimeter

概要

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As a heat exchange calorimeter may be usually operated at a non-air-conditioned laboratory, the precision water bath is needed in practice. For the reason, it was necessary that the thermal fluctuation of the bath water was kept within a narrow temperature range. In this work, fuzzy inference approach was applied to select the control input for the water bath. The cooling water kept at a temperature lower than the set temperature was circulated in the bath. The deviation corresponding to the difference between the set temperature and the observed temperature was used as the input signal. The output or control input to be given to the heater element in the water bath was calculated by the fuzzy modus. The algorithm of the output function was simplified by means of circulating the cooling water. The contribution of each membership function was changed according to the thermal progress of the observed temperature of the water. The simple control program was written in BASIC for a practical water bath, and the observed results were fairly well. Some thermal tests were also involved.
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