Thermal-economic analysis of a novel solar power tower system with CO2-based mixtures at typical days of four seasons

Yaran Liang, Xinxing Lin, Wen Su, Lingli Xing and Naijun Zhou

Energy, 2023, vol. 276, issue C

Abstract: Herein, a novel power cycle is proposed to reduce the power consumption of compression. A second heater is introduced to alleviate the pinch point problem. To efficiently convert the heat of solar power tower (SPT) system, three mixtures, namely CO2/R290, CO2/R600a and CO2/R601a, are applied to the cycle. An integrated model is established for SPT system, and thermal-economic performances are studied and compared under the irradiation conditions of typical days in four seasons. The results indicate that: in the mass fraction range of CO2-based mixture with non-flammability, as the CO2 mass fraction increases, the overall energy efficiency, exergy efficiency and generated electricity increase first and then decrease, while LCOE decreases first and then increases. The corresponding optimal system performances are respectively obtained by CO2/R290 (0.8/0.2), CO2/R600a (0.8/0.2) and CO2/R601a (0.85/0.15). Under different typical days, the energy and exergy efficiencies of summer solstice are slightly lower than those of winter solstice, but its LCOE is the lowest and generated electricity is the highest. Furthermore, performance analysis is conducted under different values of system parameters. It's found that the minimum cycle temperature has the highest sensitivity on performances.

Keywords: Solar power tower system; CO2-Based mixture; Novel power cycle; Thermal performance; Economic performance (search for similar items in EconPapers)
Date: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:276:y:2023:i:c:s0360544223009969

DOI: 10.1016/j.energy.2023.127602

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