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(a) (b) FIGURE 1: Schematic layout of the (a) charging and (b) discharging cycles for a time-shifted recompression sCO2 power cycle Heat rejection Medium temperature storage Cold storage FIGURE 2: Temperature-entropy diagram showing the charge and discharge of a time-shifted recompression sCO2 cycle. (Note, this diagram shows two stages of expansion whereas the following results are for a single expansion). Results for a TSRC-sCO2 cycle are compared to an equivalently sized recompression (RC) sCO2 cycle in Table 3. These systems use nitrate molten salts for the hot storage and are therefore limited to maximum temperatures of 565°C. By avoiding the recompression during discharge, the power cycle increases the net power output during discharge by nearly 8%, which corresponds to the heat engine efficiency increasing from 45.5% to 49.0%. The TSRC-sCO2 represents a good use of grid electricity since high values of exergetic round-trip efficiency are achieved (72.9%). On the other hand, consuming grid electricity during charge reduces the net work dispatched to the grid over a single charge-discharge cycle. As a result, the net efficiency is somewhat lower than the conventional RC-sCO2 cycle. This implies that the TSRC-sCO2 cycle generates less work per unit of solar heat than the conventional cycle. Therefore, the benefit of providing electricity storage services and being able to take advantage of price fluctuations should be considered. 7 This report is available at no cost from the National Renewable Energy Laboratory (NREL) at www.nrel.gov/publications. T (°C)PDF Image | Supercritical CO2 Heat Pumps Concentrating Solar Power
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CO2 Organic Rankine Cycle Experimenter Platform The supercritical CO2 phase change system is both a heat pump and organic rankine cycle which can be used for those purposes and as a supercritical extractor for advanced subcritical and supercritical extraction technology. Uses include producing nanoparticles, precious metal CO2 extraction, lithium battery recycling, and other applications... More Info
Heat Pumps CO2 ORC Heat Pump System Platform More Info
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