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Figure 3: Dependency of the peak heat flux observed during hydration of MgCl2 * 2 H2O on water vapour partial pressure and sample size. INFLUENCE OF HEATING RATES AND ADDITIVES ON THE DEHYDRATION TEMPERATURES Additives are considered to be helpful in the development of PCM to enhance power density by increasing thermal conductivity (graphite, nanoparticles [15, 16, 17], copper), or acting as a supporting agent, enhancing structure stability of the TCM (zeolites, other materials [18]). It is well known, that the heating rates used in TGA/DSC measurements show a strong influence on the observed temperatures, at which the dehydration reactions occur. If higher heating rates are used, observed reaction temperatures shifted upwards for two possible reasons: either heat conductivity of the material or the kinetics of the reactions itself are limiting. Figure 4 is showing observed reaction temperatures of the dehydration of MgCl2 * 6 H2O and a MgCl2 * 6 H2O : graphite composite when heated to 200°C at different rates. The addition of graphite shows the highest reduction in observed reaction temperatures at a rate of 5°C / min. The temperature ranges in which the reactions occur are lowered by 10-15°C, showing a possible influence of the heat conductivity of the material together with an effect possibly caused by the lower amounts of MgCl2 * 6 H2O used (10 mg and 6.9 mg, respectively). The influence of the added graphite naturally decreases with lower heating rates, as both effects, heat transfer and kinetic hindrance, are of lower importance at lower heating rates. At 0.1°C / min, the addition of graphite does not lead to a further reduction in the observed peak temperatures, but still sharpening of the peaks can be observed. At this very low heating rate, the material reveals dehydration temperatures below 100°C, which is an interesting fact regarding possible applications connected to CHP plants, where heat at a temperature of 90-95°C can be stored to make electricity production more flexible.PDF Image | THERMOCHEMICAL STORAGE MATERIALS RESEARCH
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