Thermocline thermal storage systems for concentrated solar power plants: One-dimensional numerical model and comparative analysis

Modi, Anish; Segarra, Carlos David Pérez

doi:10.1016/j.solener.2013.11.033

Cited by 74 publications

(20 citation statements)

References 24 publications

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“…Most commercial TES systems consist of: one cold salt tank, one hot salt tank, an HTF-salt exchanger, pumps (to move the molten salt from one tank into the other), pipes and control valves [35]. This is the type of TES considered in this paper, although one-tank TES are also very popular in the literature [36][37][38]. It must be noticed that the use of TES is not limited to solar thermal plants: they can be integrated in other systems such as oil-fired conventional power plants [39], nuclear power plants [40] or many other applications such as hot water supply, air conditioning, heat pumps, buildings, cogeneration, etc.…”

Section: Methodsmentioning

confidence: 99%

On the Convenience of Using Simulation Models to Optimize the Control Strategy of Molten-Salt Heat Storage Systems in Solar Thermal Power Plants

Prieto

Martínez

Peon³

et al. 2017

Energies

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Thermal oil has been used as heat transfer fluid in many solar thermal power plants, which also use molten salts as thermal energy storage system. Since the engineering of these plants is relatively new, control of the thermal energy storage system is currently achieved in manual or semiautomatic ways, controlling its variables with proportional-integral-derivative (PID) regulators. Once the plant is running, it is very difficult to obtain permission to try new control strategies. Hence, most plants keep running on these simple, sometimes inefficient control algorithms. This paper explores the results obtained with different control strategies implemented on a complete model of energy storage systems based on molten salt. The results provided by the model allow the optimum control strategy to be selected. Comparison of the results obtained by simulation of these control strategies and actual results obtained from a real plant, confirm the accuracy of the selection made.

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Section: Methodsmentioning

confidence: 99%

On the Convenience of Using Simulation Models to Optimize the Control Strategy of Molten-Salt Heat Storage Systems in Solar Thermal Power Plants

Prieto

Martínez

Peon³

et al. 2017

Energies

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“…This will cause more or less discrepancy between the simulation and test results. Studies about the influence of heat loss to the temperatures in the thermal storage tanks have been reported by Modi and Pérez-Segarra [43]. The heat loss at the tank surface needs a certain length of time to penetrate and influence the temperature of the center of the tank.…”

Section: Model Validationmentioning

confidence: 99%

“…The minimum cutoff temperature is set to be 360°C in a discharge process, below which HTF cannot be effectively used for power generation. This cutoff temperature is based on the conclusion from Modi and Pérez-Segarra [43] that 30°C below the high temperature is acceptable. All the operating conditions and the properties of HTF and filler material are listed in Tables 1 and 2.…”

Section: Descriptions Of the Examplementioning

confidence: 99%

General volume sizing strategy for thermal storage system using phase change material for concentrated solar thermal power plant

Chan

et al. 2015

Applied Energy

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h i g h l i g h t sWe present a method of sizing a thermocline thermal storage system for a CSP plant. Phase change materials (PCM) are considered for this study. Sizing criterion is that the discharged fluid temperature is above a cutoff point. The sizing procedures were presented through one design example. Latent heat storage system (LHSS) Phase change material (PCM) General volume sizing strategy Enthalpy-based 1D transient model a b s t r a c tWith an auxiliary large capacity thermal storage using phase change material (PCM), Concentrated Solar Power (CSP) is a promising technology for high efficiency solar energy utilization. In a thermal storage system, a dual-media thermal storage tank is typically adopted in industry for the purpose of reducing the use of the heat transfer fluid (HTF) which is usually expensive. While the sensible heat storage system (SHSS) has been well studied, a dual-media latent heat storage system (LHSS) still needs more attention and study. The volume sizing of the thermal storage tank, considering daily cyclic operations, is of particular significance. In this paper, a general volume sizing strategy for LHSS is proposed, based on an enthalpy-based 1D transient model. One example was presented to demonstrate how to apply this strategy to obtain an actual storage tank volume. With this volume, a LHSS can supply heat to a thermal power plant with the HTF at temperatures above a cutoff point during a desired 6 h of operation. This general volume sizing strategy is believed to be of particular interest for the solar thermal power industry.

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“…[7][8][9]), and (ii) one-dimensional numerical models of significantly lower spatial resolutions but thus suitable for computationally efficient transient performance simulations (e.g. [10][11][12][13]). Model group (ii) is typically based on slightly modified Schumann equations that were presented in their original form in a pioneering work [14] in 1929.…”

Section: Nomenclaturementioning

confidence: 99%

Object-oriented Modeling of Molten-salt-based Thermocline Thermal Energy Storage for the Transient Performance Simulation of Solar Thermal Power Plants

2015

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This paper presents a one-dimensional numerical model of a molten-salt-based thermocline thermal energy storage tank. The model is explained and referenced in detail, allowing for a complete reproduction. It has been successfully validated against experimental and theoretical data from the literature. Unlike previous works, the full boundary conditions of the performed validation simulations are given, enabling future model comparison studies and thus a further check for consistency against other codes. Finally, the model has been optimized regarding simulation speed for CSP performance simulations on system level.

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Thermocline thermal storage systems for concentrated solar power plants: One-dimensional numerical model and comparative analysis

Cited by 74 publications

References 24 publications

On the Convenience of Using Simulation Models to Optimize the Control Strategy of Molten-Salt Heat Storage Systems in Solar Thermal Power Plants

On the Convenience of Using Simulation Models to Optimize the Control Strategy of Molten-Salt Heat Storage Systems in Solar Thermal Power Plants

General volume sizing strategy for thermal storage system using phase change material for concentrated solar thermal power plant

Object-oriented Modeling of Molten-salt-based Thermocline Thermal Energy Storage for the Transient Performance Simulation of Solar Thermal Power Plants

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