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research-article

THERMODYNAMIC OPTIMISATION OF SUPERCRITICAL CO2 BRAYTON POWER CYCLES COUPLED TO LINE-FOCUSING SOLAR FIELDS

[+] Author and Article Information
Luis Coco Enríquez

Senior Mechanical Engineer, Technical University of Madrid UPM, Madrid, Spain
luiscocoenriquez@hotmail.com

Javier Muñoz-Antón

PhD Mechanical Engineer, Technical University of Madrid UPM, Madrid, Spain
jamunoz@etsii.upm.es

José María Martínez-Val

Professor Mechanical Engineer, Technical University of Madrid UPM, Madrid, Spain
jm.mvp51@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4037381 History: Received February 17, 2017; Revised June 11, 2017

Abstract

An opportunity for increasing the parabolic solar power plant efficiency is substituting the actual subcritical Rankine power cycles with the innovative s-CO2 Brayton cycles. In this paper three configurations are assessed: the recompression cycle, the partial cooling with recompression cycle, and the recompression with main compression intercooling cycle, with one reheating stage. The thermodynamic parameters are optimized with three algorithms: SUBPLEX, UOBYQA and NEWOUA, and the results validated with Thermoflow Software. The parabolic troughs and linear Fresnel solar collectors are studied with different heat transfer fluids: Solar Salt, HITEC XL, Dowtherm A, Therminol-VP1, Syltherm 800 and Therminol 75. The Dual-Loop solar field, combining thermal oil and molten salt in the same solar plant, is also analysed. The plant power output and plant energy efficiency is translated into solar field aperture area and cost at Design-Point. From the point of view of the plant efficiency, the parabolic troughs with Solar Salt coupled to a s-CO2 Brayton RCMCI cycle is selected as the optimum design solution, providing a gross efficiency 51.43%. But from the point of view of minimizing the plant cost, the solar field with Dowtherm A coupled to the RCMCI is the most cost competitive design solution.

Copyright (c) 2017 by ASME
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