Equation of state based analytical formulation for optimization of sCO2 Brayton cycle

Sathish, S and Kumar, P (2021) Equation of state based analytical formulation for optimization of sCO2 Brayton cycle. In: Journal of Supercritical Fluids, 177 .

	PDF jou_sup_flu_177_2021.pdf - Published Version Restricted to Registered users only Download (1MB) | Request a copy
	Microsoft Word 1-s2.0-S0896844621001935-mmc1.doc - Published Supplemental Material Restricted to Registered users only Download (814kB) | Request a copy

Abstract

Real gas thermodynamic cycles employ state-of-the-art property routines to compute the state properties as ideal gas relations are inaccurate. Multiparameter equation of state (EOS), though accurate, is computationally time consuming due to iterative solutions needed for complex cycles. Alternatively, look-up tables alleviate the computational time but compromise the accuracy due to interpolation and extrapolation schemes. This paper proposes a novel analytical formulation to overcome the tradeoff between accuracy and computation cost. Helmholtz energy-based EOS in combination with Jacobian transformations and real gas thermodynamics is used to arrive at a single equation linking the state points of a thermodynamic cycle. The efficacy of the formulation is demonstrated to deduce the optimum pressure ratio while maximizing specific work or efficiency of a simple recuperated supercritical CO2 Brayton cycle. The difference in optimum pressure ratio predicted by the analytical formulation and conventional property-routine is inconsequential compared to an order of gain in the computational time. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Supercritical Fluids
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Brayton cycle; Carbon dioxide; Gases; Table lookup, Analytical formulation; Brayton; Computational time; Equation-of-state; Jacobians; Property; Real gas; Real gas thermodynamics; Supercritical CO-2; Thermodynamic cycle, Thermodynamic properties
Department/Centre:	Division of Mechanical Sciences > Mechanical Engineering
Date Deposited:	24 Sep 2021 07:56
Last Modified:	24 Sep 2021 07:56
URI:	http://eprints.iisc.ac.in/id/eprint/69740

Actions (login required)

View Item