Design and modeling of a high temperature solar thermal energy storage unit based on molten soda lime silica glass

Bruno Cárdenas; Noel León; John Pye; Héctor D. García

doi:10.1016/j.solener.2015.12.034

Design and modeling of a high temperature solar thermal energy storage unit based on molten soda lime silica glass

Bruno Cárdenas^*, Noel León, John Pye, Héctor D. García

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The present article addresses the design, mathematical modeling and analysis of a high temperature solar thermal energy storage unit based on molten soda-lime silica glass. The 126kWh_th storage unit is aimed to be used as one of the main components of a novel solar power-generation system intended for a continuous operation. The proposed design for the unit, as well as the restrictions imposed by its intended operation inside the power generation system, are thoroughly discussed.The development of the mathematical model used to calculate the efficiency and performance of the thermal storage unit during the different stages of the work cycle as well as the assumptions and simplifications made are comprehensively explained. The results obtained through the model are exhaustively analyzed. Special attention is paid to the assessment of the behavior of the storage unit to guarantee that the functional requirements are met; the performance of the unit is not evaluated exclusively from an energy standpoint, but an in-depth exergy analysis is also presented.The overall performance of the TES unit is satisfactory; the unit is capable of supplying the required 4kW_th output throughout the 16-h discharge while it reaches its fully charged state during the subsequent 8-h recharge. The proposed designed for the TES unit exhibits a round trip exergy-efficiency of 59%.

Original language	English
Pages (from-to)	32-43
Number of pages	12
Journal	Solar Energy
Volume	126
DOIs	https://doi.org/10.1016/j.solener.2015.12.034
Publication status	Published - 1 Mar 2016

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title = "Design and modeling of a high temperature solar thermal energy storage unit based on molten soda lime silica glass",

abstract = "The present article addresses the design, mathematical modeling and analysis of a high temperature solar thermal energy storage unit based on molten soda-lime silica glass. The 126kWhth storage unit is aimed to be used as one of the main components of a novel solar power-generation system intended for a continuous operation. The proposed design for the unit, as well as the restrictions imposed by its intended operation inside the power generation system, are thoroughly discussed.The development of the mathematical model used to calculate the efficiency and performance of the thermal storage unit during the different stages of the work cycle as well as the assumptions and simplifications made are comprehensively explained. The results obtained through the model are exhaustively analyzed. Special attention is paid to the assessment of the behavior of the storage unit to guarantee that the functional requirements are met; the performance of the unit is not evaluated exclusively from an energy standpoint, but an in-depth exergy analysis is also presented.The overall performance of the TES unit is satisfactory; the unit is capable of supplying the required 4kWth output throughout the 16-h discharge while it reaches its fully charged state during the subsequent 8-h recharge. The proposed designed for the TES unit exhibits a round trip exergy-efficiency of 59%.",

keywords = "Exergy analysis, High temperature energy storage, Sensible heat storage, Soda-lime silica glass, Solar thermal energy storage, Thermal storage",

author = "Bruno C{\'a}rdenas and Noel Le{\'o}n and John Pye and Garc{\'i}a, {H{\'e}ctor D.}",

note = "Publisher Copyright: {\textcopyright} 2015 Published by Elsevier Ltd.",

year = "2016",

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doi = "10.1016/j.solener.2015.12.034",

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AU - Cárdenas, Bruno

AU - León, Noel

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AU - García, Héctor D.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - The present article addresses the design, mathematical modeling and analysis of a high temperature solar thermal energy storage unit based on molten soda-lime silica glass. The 126kWhth storage unit is aimed to be used as one of the main components of a novel solar power-generation system intended for a continuous operation. The proposed design for the unit, as well as the restrictions imposed by its intended operation inside the power generation system, are thoroughly discussed.The development of the mathematical model used to calculate the efficiency and performance of the thermal storage unit during the different stages of the work cycle as well as the assumptions and simplifications made are comprehensively explained. The results obtained through the model are exhaustively analyzed. Special attention is paid to the assessment of the behavior of the storage unit to guarantee that the functional requirements are met; the performance of the unit is not evaluated exclusively from an energy standpoint, but an in-depth exergy analysis is also presented.The overall performance of the TES unit is satisfactory; the unit is capable of supplying the required 4kWth output throughout the 16-h discharge while it reaches its fully charged state during the subsequent 8-h recharge. The proposed designed for the TES unit exhibits a round trip exergy-efficiency of 59%.

AB - The present article addresses the design, mathematical modeling and analysis of a high temperature solar thermal energy storage unit based on molten soda-lime silica glass. The 126kWhth storage unit is aimed to be used as one of the main components of a novel solar power-generation system intended for a continuous operation. The proposed design for the unit, as well as the restrictions imposed by its intended operation inside the power generation system, are thoroughly discussed.The development of the mathematical model used to calculate the efficiency and performance of the thermal storage unit during the different stages of the work cycle as well as the assumptions and simplifications made are comprehensively explained. The results obtained through the model are exhaustively analyzed. Special attention is paid to the assessment of the behavior of the storage unit to guarantee that the functional requirements are met; the performance of the unit is not evaluated exclusively from an energy standpoint, but an in-depth exergy analysis is also presented.The overall performance of the TES unit is satisfactory; the unit is capable of supplying the required 4kWth output throughout the 16-h discharge while it reaches its fully charged state during the subsequent 8-h recharge. The proposed designed for the TES unit exhibits a round trip exergy-efficiency of 59%.

KW - Exergy analysis

KW - High temperature energy storage

KW - Sensible heat storage

KW - Soda-lime silica glass

KW - Solar thermal energy storage

KW - Thermal storage

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DO - 10.1016/j.solener.2015.12.034

M3 - Article

SN - 0038-092X

VL - 126

SP - 32

EP - 43

JO - Solar Energy

JF - Solar Energy

ER -

Design and modeling of a high temperature solar thermal energy storage unit based on molten soda lime silica glass

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