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The 4th International Symposium – Supercritical CO2 Power Cycles September 9-10, 2014, Pittsburg, Pennsylvania SCO2 POWER PEAKING AND ENERGY STORAGE SUMMARY The goal of the proposed waste heat recovery power cycle is to use ice-energy-storage to increase the amount of dispatchable energy that is available during periods of high demand and high costs. This is accomplished by using energy-storage to shift the time when excess renewable energy stored as ice (night and early morning hours) can be used to produce even more energy by recovering some fraction of the stored ice-energy, but also by increasing the heat utilization of the high temperature (538 C) waste heat source, and by increases in the SCO2 power cycle efficiency during periods of peak demand (late day time and early evening). SCO2 Refrigeration Cycle s Turbo-Expander Sat-Liq Sat-Vap Expansion Vavle 390.0 370.0 350.0 330.0 310.0 290.0 270.0 250.0 0.50 1.00 Entropy (kJ/kg-K) 1.50 2.00 Figure 4: Temperature-Entropy Diagram for the SCO2 Ice generating refrigeration system with either an expansion valve (purple) or a turbo-expander (blue). The net COP varies from 2.69 to 3.35 for the expansion valve and the turbo-expander respectively. The ability to use ice-energy-storage to shift energy production to a later time is illustrated for this concept in Figure 5. This figure shows the rate of power production over a 24 hour period for this plant. As shown, there are three periods of different net power production. On-peak power that is produced over 4 hours is 9.3 MWe, off-peak power is 5.6 MWe for a 12 hour period, and the net power during the 9 Temperatuare (K)PDF Image | Bulk Energy Storage using a Supercritical CO2 Waste Heat Recovery Power Plant
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