Development of Specific Heat Measuring Apparatus of Geothermal Related Rocks and Their Measurement

用直接法和间接法两种不同的方法测量了岩石的比热。直接法采用差示扫描量热仪。间接法是通过热线法测量导热系数和热扩散率来计算比热，而直接法最大的问题是重复性差。对于这一问题的对策，采用了粒度较小的样品和重量在一定范围内的容器。间接法成功地测量了室温至400600ﾟC温度范围内的导热系数，所测岩石为花岗岩、安山岩、砂岩、页岩和煤。在热扩散率的测量中，岩样与热线之间的接触是最重要的，它会使测量的温度与初始加热时的理论温度产生偏差。得到了在室温下的比热，得出了合理的值。

Specific heat of rocks was measured by two different methods, direct method and indirect method. In the direct method, a differential scanning calorimeter was used. In the indirect method, the specific heat was calculated by measuring the thermal conductivity and the thermal diffusivity by using the hot wire method.In the direct method, the bad repeatability was the most significant problem. As for the countermeasure of this problem the specimen with smaller particle size and the vessels, weight of them lie in a certain range, were used. The stability of the baseline was a little bit improved by these measures, but the repeatability was not sufficient.In the indirect method, the thermal conductivity was successfully measured between room temperature and 400 - 600^ﾟC. The measured rocks were granite, andesite, sandstone , shale and coals. In the measurement of the thermal diffusivity, the contact between the rock specimen and the hot wire was found to be the most important , which would deviate the measured temperature from the theoretical one at the time of the initial heating. The specific heat at the room temperature was obtained with a reasonable value.