Influence of the compression pressure ratio on the energetic and exergetic efficiency of a solar driven regenerative closed Brayton cycle with helium as working fluid

S. Sanchez-Orgaz, J. Rodríguez Martín, A. Jiménez Álvaro, I. López Paniagua, C. González Fernández and R. Nieto Carlier




One of the causes of the lack of competitiveness of solar thermal energy is its low energy and exergetic performance Therefore, it is necessary to investigate the possibility of using more efficient cycles. Closed Brayton cycles are an attractive alternative because of their good performance achieved in other applications on the same range of temperatures.
In this work the energy and exergy efficiency of a closed Brayton regenerative cycle have been calculated. The working fluid of the power block is helium. Also, the influence of the compressor pressure ratio on the energetic and exergetic efficiency has been analyzed. For this, a model of the plant in Engineering Equation Solver (EES) has been made. The maximum energy efficiency is 22.44% while the maximum exergetic efficiency is 24.09%. Both are obtained for a compressor pressure ratio of 1.634.

Published in: Renewable Energy & Power Quality Journal (RE&PQJ, Nº. 16)
Pages: 533-537 Date of Publication: 2018/04/20
ISSN: 2172-038X Date of Current Version:2018/03/23
REF: 378-18 Issue Date: April 2018
DOI:10.24084/repqj16.378 Publisher: EA4EPQ

Authors and affiliations

S. Sanchez-Orgaz1, J. Rodríguez Martín1, A. Jiménez Álvaro1, I. López Paniagua1, C. González Fernández1 and R. Nieto Carlier1
1. ETSI Industriales-Universidad Politécnica de Madrid, Spain

Key words

Helium, Closed Brayton, solar thermal, energetic, exergetic


[1] W.H Stein and R. Buck. Advanced power cycles for concentrated solar power. Solar Energy (2017), Vol. 152, pp. 91-105.
[2] V. Zare and M. Hasanzadeh. Energy and exergy analysis of a closed Brayton cycle-based combined. Energy Conversion and Management (2016). Vol. 128, pp. 227-237.
[3] K. Kusterer, R. Braun, N. Moritz, G. Lin, and D. Bohn. Helium Brayton Cycles with Solar Central Receivers: Thermodaynamic and Design. ASME Turbo Expo 2012.
[4] K. Kusterer, R. Braun, N. Moritz, T. Sugimoto, K. Tanimura and D. Bohn. Comparative study of solar thermal Brayton cycles operated with helium or argon. ASME Turbo Expo 2013.
[5] S.M, Besarati and D.Y. Goswami. A computationally efficient method for the design of the heliostat field for solar power tower plant. Renewable Energy (2014). Vol. 69, pp. 226-232.
[7] S.A. Kalogirou, S. Karellas, V. Badescu, and Braimakis. Exergy analysis on solar thermal systems: a better understanding of their sustainability. Renewable Energy (2016). Vol. 85, pp. 1328-1333.
[8] S.A Klein, S. A. and F.L Alvarado. Engineering equation solver. F-Chart Software. (2002).
[9] V. S. Reddy, S.C. Kaushik, K.R. Ranjan and S.K. Tyagi, State-of-the-art of solar thermal power plants- A review. Renewable and Sustainable Energy Reviews (2013). Vol. 27, 2013, pp. 258-273.