New Concepts FOR Organic Rankine Cycle Power Systems

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New Concepts FOR Organic Rankine Cycle Power Systems ( new-concepts-for-organic-rankine-cycle-power-systems )

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II III 4.3 (c) An isentropic expansion starting from saturated vapour conditions always evolves towards superheated–vapour states (dvs → e). (d) Furthermore, the temperature of the superheated vapor at the end of the expansion may be so high that internal heat-regeneration is mandatory if high cycle efficiency is required [25]. Mainly as a consequence of the higher molecular weight, a lower specific enthalpy drop is associated with the given expansion. Thus, the working fluid mass-flow through the ex- pander must be larger for the same power output. In combination, the low specific enthalpy drop and the higher mass-flow rate allow for the realization of comparatively simple and efficient turbines even for low or very low power outputs [14, 23]. The saturation pressure corresponding to the maximum cycle temperature is lower (e.g., 4.9 bar for D4 versus 39.8 bar for water): this is a major advantage if TES is of interest. Conversely, very low condensation pressure (e.g., 0.09 bar for D4 versus 1.01 bar for water) entails technological challenges for other components (e.g., turbines and condenser), see Refs. [11, 26]. Concepts of TES Systems for Power Plants Thermal Energy Storage for Solar Powered ORC Engines The basic principle of storage system integration into power plants is the so-called flow-storage, whereby the TES gets its charge according to several main concepts, corresponding to the plant configurations summarized in fig. 4.2a. In solar power plants, storage systems deal with secondary energy since, as opposed to fuelled thermal plants, storage on the primary energy side (fuel storage) is not possible. Fuel control would be feasible (defocusing of heliostats or collectors) but it is avoided because of the energy loss. Energy storage integrated into the primary heat transfer loop, 1234 acd b Solar field TES system Heat exc. Power block (Oil) (Oil/Salt) (Oil/H2 0) (H2 0) (a) Basic schemes for secondary energy storage in (b) State of the art: simplified process flow Rankine power plants: 1) primary energy, 2) sec- diagram of the Andasol solar power plant, ondary energy, 3) mechanical energy, 4) electrical adapted from [28]. energy. The tags a, b, c and d help identifying sev- eral so-called flow-storage options, adapted from [27]. Figure 4.2: Thermal energy storage in Rankine-cycle power plants. 93 􏰜

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