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Research Papers: Energy Storage/Systems

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 16846-13114, Iran
e-mail: shderakhshan@iust.ac.ir

Mohammadreza Khosravian

Department of Mechanical Engineering,
Iran University of Science and
Technology (IUST),
Tehran 16846-13114, Iran

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received March 26, 2018; final manuscript received December 19, 2018; published online January 30, 2019. Assoc. Editor: Esmail M. A. Mokheimer.

J. Energy Resour. Technol 141(8), 081901 (Jan 30, 2019) (12 pages) Paper No: JERT-17-1585; doi: 10.1115/1.4042415 History: Received March 26, 2018; Revised December 19, 2018

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 ratio 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, ambient temperatures, output pressures of the second compressor, and mass flow rates of the collectors fluid on the exergy ratio are investigated. The results revealed that the system could produce 17526.15 kJ/s (17.5 MW) power in high demands time and 2233.48 kJ/s (2.2 MW) power in low demands time and the system shows that a value of 15.13% round trip exergy ratio is achievable. Furthermore, the exergy ratio decreased by 5.1% when the air storage mass flow rate increased from 10 to 15 kg/s. Furthermore, the exergy ratio decreases by increasing the collectors inside fluid mass flow rate or by decreasing radiation intensity.

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Figures

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Fig. 1

The scheme of the proposed plant

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Fig. 2

The block diagram of the proposed plant

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Fig. 3

The simulation method flow chart

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Fig. 4

The convergence process

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Fig. 5

Turbines output works and pumps and compressors input works

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Fig. 6

The exergy changes for the pertinent cycle

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Fig. 7

The T–Q diagram for the HE11

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Fig. 8

The T–Q diagram for the cold box

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Fig. 9

The effect of different radiation intensities: (a) on the roundtrip exergy ratio and the output temperature of the solar collectors (T38) and (b) on the thermal efficiencies

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Fig. 10

The effect of different ambient temperatures: (a) on the roundtrip exergy ratio and input exergy and (b) on the thermal efficiencies

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Fig. 11

The effect of different outlet pressure of the second compressor: (a) on the roundtrip exergy ratio and (b) on the thermal efficiencies

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Fig. 12

The effect of different mass flow rate of the point 35: (a) on the roundtrip exergy ratio and the output temperature of the solar collectors (T38) and (b) on the thermal efficiencies

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