Operation strategies and performance of solar thermal power plants operating from PCM storage

Ronen Yogev, Abraham Kribus*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

22 Scopus citations

Abstract

Thermal storage with latent heat of phase change materials (PCM) is a desirable component in solar thermal power plants based on steam cycles, to provide heat for evaporation at nearly constant temperature, leading to stable plant operation and longer operation hours. This paper analyzes the relation between stored heat discharge rate, plant operation mode, and the power plant overall performance. The storage and plant models are simple and easily solved, yet they describe major performance characteristics observed in experiments. We show that the sliding pressure mode with constant heat extraction, currently preferred for operation from storage, does not provide constant electrical power output. A variant of sliding pressure, accounting for the variation of the thermodynamic cycle efficiency, can achieve nearly constant electrical power output. Moreover, the model shows that constant power operation can be achieved even for natural PCM without heat transfer enhancement, potentially reducing the complexity and cost of the storage system.

Original languageEnglish
Pages (from-to)170-180
Number of pages11
JournalSolar Energy
Volume95
DOIs
StatePublished - Sep 2013

Funding

FundersFunder number
Ministry of National Education and Research, France
Ministry of Foreign Affairs
Ministry of Science and Technology, Israel

    Keywords

    • Concentrating solar power (CSP)
    • Direct steam generation (DSG)
    • Latent heat thermal storage
    • Phase change materials

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