Abstract
In our previous study of a CO2 hydrate engine generator (CHEG), the analysis results were clarified that the net electricity output was 1.4 kWh per 1 m3 water. This results were evaluated under the condition where the temperatures of the cold heat source and the hot heat source were 253 K and 313 K, respectively. Generally, the temperature of the outside air is not less than 253 K. Therefore, it is necessary to consider how to enable the energy storage by using the cold heat source which temperature is higher than 253 K. Along with the rise of the temperature of the cold heat source, the hydrate generation speed decreases and the duration time for the energy storage increases. The hydrate generation speed is proportional to the pressure difference between the generation pressure and the phase equilibrium pressure of the hydrate. The phase equilibrium pressure is possible to be moved to the high temperature and low pressure side by adding cyclopentane and its derivatives (c-C5H10, c-C5H8O, and c-C5H9F) , as generation reaction promotors, to the simple CO2 hydrate. In this paper, the influence of the hydrate generation speed on the energy storage speed is investigated, by means of numerical analysis. The numerical results indicate that the suitable promoters are c-C5H8 and c-C5H9F, corresponding to the temperature of the cold heat source is 273 K.
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