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research-article

Exergy optimization of a novel combination of a liquid air energy storage system and a parabolic trough solar collector power plant

[+] Author and Article Information
Shahram Derakhshan

Department of Mechanical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
shderakhshan@iust.ac.ir

mohammadreza khosravian

Department of Mechanical Engineering, Iran University of Science and Technology (IUST), Tehran, Iran
mrkhosravian@yahoo.com

1Corresponding author.

ASME doi:10.1115/1.4042415 History: Received March 26, 2018; Revised December 19, 2018

Abstract

In this paper, a parabolic trough solar collector (PTSC) plant is combined with a liquid air energy storage (LAES) system. The genetic algorithm (GA) is used to optimize the proposed system for different air storage mass flow rates. The roundtrip exergy efficiency is considered as the objective function and pressures of six points and mass flow rates of five points are considered as design parameters. The effects of some environmental and key parameters such as different radiation intensities, different ambient temperatures, different output pressures of the second compressor and different mass flow rates of the collectors fluid on the exergy efficiency are investigated. The results revealed that the system could produce 17526.15 kJ/s power in high demands time and 2233.48 kJ/s power in low demands time and the system shows a value of 15.13% round trip exergy efficiency is achievable. Furthermore, the exergy efficiency decreased by increasing the air storage mass flow rate (the efficiency is decreased by 5.1% when the air storage mass flow rate increased from 10 to 15 kg/s). Furthermore, the exergy efficiency decreases by increasing the collectors inside fluid mass flow rate or by decreasing radiation intensity.

Copyright (c) 2018 by ASME
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