Journal article
Thermodynamic feasibility of alternative supercritical CO2 Brayton cycles integrated with an ejector
Applied Energy, Vol.169, pp.49-62
2016
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Abstract
<p><p id="x-x-sp010">Supercritical CO<sub>2</sub> Brayton cycle has emerged as an alternative power block for Concentrated Solar Thermal (CST) systems and nuclear plants. In order to optimise the thermal performance of the Supercritical CO<sub>2</sub> Brayton cycles, a combination of high pressure and temperature are required. The high pressure of the S-CO<sub>2</sub> Brayton cycles has a remarkable effect on not only the thermal performance of the cycle but also the thermodynamic and mechanical performance of the solar receiver. In this paper, three S-CO<sub>2</sub> Brayton cycle configurations without reheat are proposed by introducing an ejector prior the heater, which reduces the pressure at the solar receiver. A comprehensive thermodynamic analysis and a multi-objective optimisation were performed to study the thermodynamic feasibility of the proposed cycles. The effect of the cycle pressure ratios, turbine split ratio, turbine inlet temperature and exit pressure of the ejector on the thermal performance and output parameters of the S-CO<sub>2</sub> Brayton cycles assisted by an ejector was analysed. The proposed configurations were compared with the conventional S-CO<sub>2</sub> Brayton cycles without reheat and referenced steam Rankine cycles (projected thermal efficiencies of 0.416–0.47 in 2020–2025). The results showed that under some operating conditions, the proposed configurations assisted by an ejector can achieve higher efficiencies than the referenced steam Rankine cycles. As the ejector exit pressure increased, the thermal performance of the proposed configurations approached the conventional supercritical CO<sub>2</sub> Brayton cycles.</p>
Details
- Title
- Thermodynamic feasibility of alternative supercritical CO2 Brayton cycles integrated with an ejector
- Creators
- Ricardo Vasquez Padilla - Southern Cross UniversityYen Chean Soo Too - CSIRO Energy Technology, AustraliaRegano Benito - CSIRO Energy Technology, AustraliaRobbie McNaughton - CSIRO Energy Technology, AustraliaWes Stein - CSIRO Energy Technology, Australia
- Publication Details
- Applied Energy, Vol.169, pp.49-62
- Identifiers
- 3848; 991012822293802368
- Academic Unit
- School of Environment, Science and Engineering; Faculty of Science and Engineering; Engineering
- Resource Type
- Journal article