Organic Rankine Cycle Solar-Thermal Powerplants

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Organic Rankine Cycle Solar-Thermal Powerplants ( organic-rankine-cycle-solar-thermal-powerplants )

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90 6.2.1 Storage Concepts Two-Tank Two-tank thermal energy storage systems use two reservoirs, a “hot tank” and “cold tank” to store thermal energy. Both direct and indirect versions of a two-tank storage system are shown in Figure 6.1. To charge the direct system (Figure 6.1(b)), high temperature fluid exiting the solar field is allowed to accumulate in the “hot tank” while low temperature fluid is pumped from the cold tank to supply the solar field. When discharging, the fluid in the “hot tank” is pumped to provide thermal energy to the power cycle and before returning to the “cold tank” as it is diverted away from the solar field. In the case of the indirect system (Figure 6.1(a)) the system is charged by diverting solar field fluid flow from the power cycle through the heat exchanger while the storage fluid is heated as it is pumped to from the “cold tank” to the “hot tank.” When discharging, the flow directions through the heat exchanger are reversed and solar field fluid flow is diverted away from the solar field. The indirect two-tank system can also be configured so that the storage fluid provides thermal energy to the power cycle instead of the solar field fluid. (a) (b) Figure 6.1: Two-tank thermal energy storage systems, (a) Indirect, and (b) Direct Stratified (Thermocline) The term thermocline refers to the sharp fluid temperature gradient (stratification) that develops between high and low temperature fluid in a storage tank. Stratification is caused by fluid buoyancy resulting from the variation in fluid density with temperature

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