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Bahram Saadatfar, Reza Fakhrai and Torsten Fransson, JMES Vol 2 Issue 1 2014 investigation. Bao et al. [51] studied autocascade cycles with exergy analysis. Regenerative and simple cycle is compared by Mago et al. [52]. Moreover, dual loop cycle performance of ORC are studied by Zhang et al. [53]. Fig. 4 Different ORC layout [50] 2.3 Zeotropic vapor cycles Zeotropic mixture has a property named “temperature glide” in isobaric evaporation and condensation process. Because of the temperature difference they can reduce exergy destruction rate [54]. Another advantage of using zeotropic mixtures is that the power cycle can be operated at a relatively low pressure. Zeotropic mixtures are characterized by non- isothermal phase transitions at a constant pressure. It can be seen from Fig. 3(b) that zeotropic working fluid’s temperature glide follows close to the temperature profile of the thermal source compared with the ORC’s in Fig. 3 (a). This shows a reduction in the heat addition irreversibility [55,56]. Even though the temperature matching can be improved with zeotropic mixtures in vapor cycles, the disadvantage is that the mixtures always have a lower convective heat transfer coefficient in comparison with pure components for a given temperature difference because of the “diffusion resistance” to heat transfer for mixtures [57]. 6PDF Image | Thermodynamic Vapor Cycles for Converting Low- to Medium-grade Heat to Power: A State-of-the- art Review and Future Research Pathways
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