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Publication Title | Multi- Objective Optimisation of CO2 Recompression Brayton Cycle for Central Receivers

Organic Rankine Cycle

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R. Vasquez Padilla

Multi- Objective Optimisation of CO2 Recompression Brayton Cycle for Central Receivers

Ricardo Vasquez Padilla1, Regano Benito2 and Wes Stein3

CSIRO Energy Technology

1Postdoctoral Fellow, PO Box 330, Newcastle, NSW 2300, 2Principal Research Engineer, PhD, PO Box 136, North Ryde, NSW 2113 3Solar Research Program Leader, PO Box 330, Newcastle, NSW 2300 E-mail: Ricardo.vasquezpadilla@csiro.au

Abstract

Concentrated Solar Power using supercritical CO2 (S-CO2) recompression Brayton cycles offer advantages of similar and even higher overall thermal efficiencies compared to power cycles using superheated or supercritical steam. The high efficiency and compactness of S-CO2, as compared with steam Rankine cycles operating at the same high temperature, make this cycle attractive for central receiver applications.

In this paper a multi-objective optimisation, based on energy and exergy analyses of a CO2 Recompression Brayton cycle, is performed. Energy, exergy and mass balance are carried out for each component and cycle first law efficiency and exergy destruction are calculated. In order to obtain optimal operating condition, two different sets, each including two objectives parameters, are considered individually. The pairs maximized separately were as follows: and

. The input variable vector used for this simulation was: . Optimisation is then carried out by using Non-dominated Sorting Genetic Algorithm-II (NSGA-II) and optimum Pareto front are obtained. The optimisation process was performed by using Inspyred 1.0 developed in Python 2.7. The results showed that an improvement in net work output causes deterioration of the cycle first law and overall exergy efficiency, while at the same time the total exergy destruction of the cycle is increased. The multi-objective optimisation of the cycle first law and exergy efficiency obtained results very close to those obtained by single objective optimisation of the cycle first law efficiency. The results showed that the overall exergy efficiency reached a maximum value at 600 °C (21.03%) while the cycle first law efficiency increases monotonically with the highest

temperature of the cycle, achieving a thermal efficiency of 52.8% at 850 °C.

Peer Reviewed Paper

Nomenclature

CO C2

Carbon dioxide

Concentration ratio

e

Specific exergy [kJ/kg]

h

Specific enthalpy[kJ/kg]

hconv

Convective heat transfer coefficient [W/m 2 K]

s

Specific entropy [kJ/kg-K]

EDNI

Direct normal irradiance [W/m 2]

𝐸̇𝑑

Exergy destroyed rate [kW]

𝐸̇𝑙𝑜𝑠𝑠

Exergy loss rate [kW]

𝐸̇𝑞𝑗

Exergy of heat transfer rate [kW]

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