自己温度制御型面状発熱体
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概要
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The temperature distribution of a PTC planar heaters with self control temperature has been investigated. The main results obtained are summarized as follows; (1) For the temperature distribution, the results of the numerical calculations using one dimensional thermal model were in good agreement with the experimental results. (2) The product of thickness and thermal conductivity and the distance between electrodes have strongly influence on inhomogeneous temperature distribution. And then we obtain the improvement conditions for inhomogeneous temperature distribution.(3) In order to improve the temperture distribution, laminating heater element together with metal plate is effective equivalently. This improvement does not degrade the self control temperature characteristics. (4) Because of parallel structure rather than single structure, the temperature distribution of the heater shows a peak at every two heater elements, whereas the boundary conditions of individual heater elements approach adiabatic condition with the increase in the number of parallel elements. (5) The degree of inhomogeneous temperature distribution is introduced S-value which is the standard deviation normalized by the mean value for the given temperature distribution. (6) When the inhomogenety of temperature distribution is valued by the S-value, the value at self controlled temperature region is affected by the length between electrodes and the number of parallel heater element. (7) Finally, the design method for PTC planar heater with parallel structure is showed concretely.
- 1999-10-29
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