Techno-economic comparison between CSP plants presenting two different heat transfer fluids

Sau, Salvatore; Corsaro, Natale; Crescenzi, Tommaso; D’Ottavi, Cadia; Liberatore, Raffaele; Licoccia, Silvia; Russo, Valeria; Tarquini, P.; Tizzoni, Anna Chiara

doi:10.1016/j.apenergy.2016.01.066

Cited by 55 publications

(26 citation statements)

References 15 publications

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“…The benefit of using molten salts as heat transfer fluids results from the increase in the allowable maximum operating temperature [15,21]. However, molten salts with the desired thermal stability limit have freezing/melting points well above ambient temperature.…”

Section: Solar Saltmentioning

confidence: 99%

Feasibility Study of Freeze Recovery Options in Parabolic Trough Collector Plants Working with Molten Salt as Heat Transfer Fluid

et al. 2019

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Parabolic trough collector (PTC) technology is currently the most mature solar technology, which has led to the accumulation of relevant operational experience. The overall performance and efficiency of these plants depends on several components, and the heat transfer fluid (HTF) is one of the most important ones. Using molten salts as HTFs has the advantage of being able to work at higher temperatures, but it also has the disadvantage of the potential freezing of the HTF in pipes and components. This paper models and evaluates two methods of freeze recovery, which is needed for this HTF system design: Heat tracing in pipes and components, and impedance melting in the solar field. The model is used to compare the parasitic consumption in three molten salts mixtures, namely Solar Salt, HiTec, and HiTec XL, and the feasibility of this system in a freezing event. After the investigation of each of these subsystems, it was concluded that freeze recovery for a molten salt plant is possible.

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Section: Solar Saltmentioning

confidence: 99%

Feasibility Study of Freeze Recovery Options in Parabolic Trough Collector Plants Working with Molten Salt as Heat Transfer Fluid

et al. 2019

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“…As a result, the cost (Cost i,t ) within a year i for each type facility t can be calculated as: (5) In turn, the annual cost (Cost i ) to the SES in a year i of all the SCSPS under the RD 661/2007 can be determined by: (6) In the same way, the cost of promotion of each type facility t during its lifetime can be calculated as:…”

Section: Objectives and Working Mechanism Of The Rdmentioning

confidence: 99%

“…Similar to that done in Eq. (1), it has been assumed that Nh_inst i follows a decreasing function of the input parameters yearly degradation rate (K R ) 5 of the CSPP and initial number of equivalent operating hours within the year a + 1 (Nh_inst a+1 ), 6 where (a) is the year in which the operating permit is obtained (see Eq. (12)).…”

Section: Objectives and Working Mechanism Of The Rdmentioning

confidence: 99%

Assessing the 2014 retroactive regulatory framework applied to the concentrating solar power systems in Spain

et al. 2018

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The RD 413/2014 new economic and regulatory framework applied to the concentrating solar power plants (CSPP) in Spain has been here analysed and its new remuneration scheme has been formulated, becoming evident its high complexity and the great number of regulatory parameters involved. Next, a new model focused on determining its impact on the economic results of the existing CSPP has been proposed. Due to the complexity of the system, a methodology comprising a set of different stages of analysis has been developed. The new model has proven to be a useful tool to analyse the economic impact of the new regulatory scheme on the facilities and to identify its most influential regulatory parameters. One of the most representative facilities has been chosen as a case study to undertake the analysis. The results of the analysis, which have shown a substantial profitability reduction, have been consistent with the appreciations and data provided by the claimants of the last arbitral Award concerning the Kingdom of Spain and investors of CSPP in this country.

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“…To summarize, no data are currently available about PCM packed-bed heat exchangers operating at high-temperature levels, especially around 600 • C, although this value is of particular interest given a Rankine power block presents a quite high efficiency if the steam operates between 530 and 240 • C [22,31]. In particular, a storage system presenting this working temperature can be suitable for CSP configurations operating with air as HTF.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Chloride-Carbonate Phase Change Material: Thermal Performances and Modelling of a Packed Bed Storage System for Concentrating Solar Power Plants

Tripi

Tizzoni

et al. 2021

Energies

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Molten salts eutectics are promising candidates as phase change materials (PCMs) for thermal storage applications, especially considering the possibility to store and release heat at high temperatures. Although many compounds have been proposed for this purpose in the scientific literature, very few data are available regarding actual applications. In particular, there is a lack of information concerning thermal storage at temperatures around 600 °C, necessary for the coupling with a highly efficient Rankine cycle powered by concentrated solar power (CSP) plants. In this contest, the present work deals with a thermophysical behavior investigation of a storage heat exchanger containing a cost-effective and safe ternary eutectic, consisting of sodium chloride, potassium chloride, and sodium carbonate. This material was preliminarily and properly selected and characterized to comply with the necessary melting temperature and latent enthalpy. Then, an indirect heat exchanger was considered for the simulation, assuming aluminum capsules to confine the PCM, thus obtaining the maximum possible heat exchange surface and air at 5 bar as heat transfer fluid (HTF). The modelling was carried out setting the inlet and outlet air temperatures at, respectively, 290 °C and 550 °C, obtaining a realistic storage efficiency of around 0.6. Finally, a conservative investment cost was estimated for the storage system, demonstrating a real possible economic benefit in using these types of materials and heat exchange geometries, with the results varying, according to possible manufacturing prices, in a range from 25 to 40 EUR/kWh.

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Techno-economic comparison between CSP plants presenting two different heat transfer fluids

Cited by 55 publications

References 15 publications

Feasibility Study of Freeze Recovery Options in Parabolic Trough Collector Plants Working with Molten Salt as Heat Transfer Fluid

Feasibility Study of Freeze Recovery Options in Parabolic Trough Collector Plants Working with Molten Salt as Heat Transfer Fluid

Assessing the 2014 retroactive regulatory framework applied to the concentrating solar power systems in Spain

High-Temperature Chloride-Carbonate Phase Change Material: Thermal Performances and Modelling of a Packed Bed Storage System for Concentrating Solar Power Plants

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