Abstract
During the development of transferable measurement techniques for the heat capacity of raw coal, it was observed that the atmosphere in sealed sample cells affected the thermal behavior, particularly during the initial measurements. The model which had been used to represent the specific heat of coal did reproduce the results in air but failed to reproduce the deep exotherm of the thermograms obtained in nitrogen. The specific heat of coal has been determined in helium, argon, and carbon monoxide to provide insight into possible modifications to the model. The results of initial and repeat runs in the five different atmospheres and the impact of these results on the modeling are presented and discussed. The agreement between the experimental heat capacity and that predicted by the model, up to 500 K, is excellent and supports Merrick's predictions for the heat capacity of coal.
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Callanan, J.E., Sullivan, S.A. & MacDonald, R.A. Experimental determination and modeling of the heat capacity of coal in various atmospheres. Int J Thermophys 8, 133–145 (1987). https://doi.org/10.1007/BF00503229
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DOI: https://doi.org/10.1007/BF00503229