Title: Energy and exergy analysis of advanced absorption power cycles using salt-water mixtures as working fluids

Authors: Hasan Ozcan; Salem Yosaf

Addresses: Faculty of Engineering, Mechanical Engineering Department, Karabuk University, Demir Celik Kampusu, 78050, Karabuk, Turkey ' Faculty of Engineering, Mechanical Engineering Department, Karabuk University, Demir Celik Kampusu, 78050, Karabuk, Turkey

Abstract: In advanced absorption power cycles (AAPCs), a jet ejector is installed at the absorber inlet and serves for two main functions; it assists pressure recovery, and improves the mixing between the weak solution and the vapour coming from the turbine. These effects enhance the absorption of the vapour into the solution resulting in a better performing power cycle. The influence of the jet ejector on the energy and exergy efficiencies of an AAPC is evaluated, and the thermodynamic efficiencies of the AAPC are compared to those of conventional absorption power cycle (APC_S) using three different working fluids, namely ammonia-water solution (NH₃-H₂O), lithium bromide-water solution (LiBr-H₂O), and lithium chloride-water solution (LiCl-H₂O). Five cases are studied that represents the improvement in the AAPC_S efficiencies as results of jet ejector integration in the cycle. Results of parametric studies depict that LiCl-H₂O exhibits the highest energy and exergy efficiencies used in AAPC.

Keywords: APC; absorption power cycle; AAPC; advanced absorption power cycle; jet ejector; LiBr-water; NH₃-water; LiCl-water; energy; exergy.

DOI: 10.1504/IJEX.2018.090323

International Journal of Exergy, 2018 Vol.25 No.3, pp.187 - 202

Received: 21 Aug 2017
Accepted: 02 Oct 2017
Published online: 12 Mar 2018 *

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