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Modelling and performance evaluation of a direct steam generation solar power system coupled with steam accumulator to meet electricity demands for a hospital under typical climate conditions in Libya

Ehtiwesh, Amin; Kutlu, Cagri; Su, Yuehong; Riffat, Saffa

Modelling and performance evaluation of a direct steam generation solar power system coupled with steam accumulator to meet electricity demands for a hospital under typical climate conditions in Libya Thumbnail


Authors

Amin Ehtiwesh

YUEHONG SU YUEHONG.SU@NOTTINGHAM.AC.UK
Professor of Thermal Science and Building Technology

SAFFA RIFFAT saffa.riffat@nottingham.ac.uk
Professor of Sustainable Energy Systems



Abstract

This study aims to build a dynamic model of a direct steam generation (DSG) solar power system coupled with a steam accumulator to meet electricity demands for a hospital under transient environmental conditions in Libya. The main components of the system are DSG parabolic trough collectors, a steam accumulator, a turbine, a condenser and a circulation pump. The system is modelled via using Simulink\Simscape software blocks with integrated MATLAB functions to run a dynamic simulation. As the simulation tool reflects the transient operation of the components, advanced control strategies were applied to the model. Using the proportional integral controller (PI controller), safe operation of the system is secured by pump flow rate control, safe turbine operation is provided by pressure control and power output is matched with the demand by using a throttle valve control. 1584 m2 solar collector area and 160 m3 total volume of pressurized steam tank are used in the simulation considering the electricity demand of the hospital and solar radiation in the location. The produced work output was controlled to match the demand profile of the hospital, which needs 200 kW in the peak period and 50 kW at the night. The designed system shows a maximum thermal efficiency of 23.5% for the operation condition.

Citation

Ehtiwesh, A., Kutlu, C., Su, Y., & Riffat, S. (2023). Modelling and performance evaluation of a direct steam generation solar power system coupled with steam accumulator to meet electricity demands for a hospital under typical climate conditions in Libya. Renewable Energy, 206, 795-807. https://doi.org/10.1016/j.renene.2023.02.075

Journal Article Type Article
Acceptance Date Feb 17, 2023
Online Publication Date Feb 12, 2023
Publication Date Apr 1, 2023
Deposit Date Feb 23, 2023
Publicly Available Date Mar 28, 2024
Journal Renewable Energy
Print ISSN 0960-1481
Electronic ISSN 1879-0682
Publisher Elsevier BV
Peer Reviewed Peer Reviewed
Volume 206
Pages 795-807
DOI https://doi.org/10.1016/j.renene.2023.02.075
Keywords Demand profile; Direct steam generation Rankine Cycle; Operation control; SimulinkSimscape; Steam accumulator
Public URL https://nottingham-repository.worktribe.com/output/17661538
Publisher URL https://www.sciencedirect.com/science/article/pii/S0960148123002264

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