A chemical reaction energy storage system of the methanation-reforming type is considered for storing 2550 MWh of electrical energy. The system turnaround efficiency is estimated at 0.85. The main powerplant thermal efficiency is 0.38. Calculate
(a) the individual masses, in kilograms, of reactant and product gases
(b) the necessary storage volumes, in cubic meters, assuming storage is at 70 bar and 500°C
(c) the maximum mechanical energy to be stored, in kilojoules, assuming for simplicity that pressure temperature, and pressure drops are the same in all reactors and tanks, and that all expanders and compressors have an efficiency of 0.60.
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