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CPOTE2020 logo
6th International Conference on
Contemporary Problems of Thermal Engineering
Online | 21-24 September 2020

Abstract CPOTE2020-1104-A

Book of abstracts draft
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Exergy-based comparative analysis of solar technologies for implementation in Integrated Solar Combined Cycle (ISCC) systems

Louay ELMORSY, Technische Universität Berlin, Germany
Tatiana MOROSUK, Technische Universität Berlin, Germany
George TSATSARONIS, Technische Universität Berlin, Germany

It is a fact that electricity is the key factor for modern economies and its demand will keep growing. Increased harmful emissions impel exploring more sustainable energy conversion systems. Concentrated solar power is one of the preeminent solutions. However, one of the barriers is its location dependency and high capital investment which did not significantly decrease as it was forecasted. Integrated solar combined-cycle power plants might be one of the keys for facilitating the transition towards higher concentrated solar power shares. This paper provides an exergy-based and economic comparative analysis for the three most promising solar thermal technologies being implemented in integrated solar combined-cycle systems. Namely, direct steam generation linear Fresnel collectors and solar power tower as well as oil parabolic trough collectors. All systems are designed based on the power-boosting operation mode for adding 50MWe during day operation. The integration of solar heat is in parallel to either the evaporator or evaporator and superheater of the high pressure level heat recovery steam generator. The exergetic analysis shows that configurations utilizing Fresnel collectors results the highest exergetic efficiencies while the configuration utilizing the solar tower results the least efficiency. Integrating the solar field into the high pressure level results in higher efficiencies for day operation. However, limits the steam cycle to benefit from higher pressures levels, especially during night operation as the cycle has to operate on the same design pressure level for avoiding possible part-load losses. Findings of the economic analysis show that sharing the same power block of the combined-cycle plant results in a significantly lower incremental specific investment cost for concentrated solar power that helps new installations at moderate investments and thus leading to steeper learning curves of the technology. Configurations utilizing solar collectors with direct steam generation produce electricity at a lower price. Parabolic trough collectors require experimental validation for reaching increased temperatures. The configuration utilizing oil parabolic trough produces electricity at the highest price whereas the configuration utilizing solar power tower produces the cheapest electricity with 1.77 $MWh difference.

Keywords: Concentrated solar power (CSP), Integrated solar combined cycle, Direct steam generation, Exergy-based analysis, Economic assessment