Off-design simulation and performance of molten salt cavity receivers in solar tower plants under realistic operational modes and control strategies

Tehrani, S. Saeed Mostafavi; Taylor, Robert A.

doi:10.1016/j.apenergy.2016.07.032

Cited by 60 publications

(10 citation statements)

References 48 publications

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“…The off‐design results obtained using the present model were compared with solar field mass flow rate, receiver efficiency, and receiver thermal power data obtained by Tehrani and Taylor 46 and SAM, 47 as shown in Figure 4. This figure shows ambient temperature variation over 4 hours (1‐4 PM ) on the first day of January with corresponding DNI.…”

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

“…In order to validate the present CSP model and storage capability, the results were compared with the design point parameters of the 20 MW e Gemasolar power plant 20 . The model results were also compared with the Gemasolar power plant off‐design data obtained by Tehrani and Taylor 46 and System Advisor Model (SAM) 47 . Before conducting the comparison, the design point conditions of the Gemasolar power plant 20,46 were defined, as shown in Table 5, and used as inputs for the present model.…”

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

“…Off‐design results validation of CST model compared with Gemasolar power plant data obtained from SAM 47 and Tehrani and Taylor model results 46 : (A) solar field mass flow rate, (B) receiver efficiency, and (C) receiver thermal output [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

“…Verification of the potential of CST model for transient simulations in compasion with Gemasolar power plant data 47 and Tehrani and Taylor model results 46 …”

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

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Nuclear renewable hybrid energy system assessment through the thermal storage system

Bayomy

Moore

2020

Int J Energy Res

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Summary In support of the use of more efficient and low‐carbon nuclear energy along with solar energy in power generation systems, the present paper presents a technical‐economic analysis of a nuclear renewable hybrid energy system (NR‐HES) case study for a given electricity and residential heat demand profiles of a typical remote community in Canada. The studied hybrid energy system is composed of a small modular nuclear reactor (SMR), a concentrated solar tower (CST), and a thermal energy storage (TES) unit. A fossil fuel backup energy source is also considered to generate excess electricity as needed. The CST and nuclear reactor both share the same TES system. Five different thermal storage fluids are examined: Therminol, Dowtherm, solar salt, Hitec salt, and Hitec XL salt. A transient thermodynamic mathematical model is developed in order to determine the overall configuration, performance, and operation strategy for the NR‐HES. The operational strategy of the NR‐HES is based on the steady‐state full‐power operation of the SMR, storing the excess energy in the TES system when the combined nuclear and solar power generation exceeds the power demand of the electrical grid and using the stored thermal energy during the periods of peak demand A detailed economic analysis of the NR‐HES is conducted for each operational scenario, including the annualized cost of the TES system and the NR‐HES plant, as well as annual revenue and profit generated by the TES system. The developed model is used to obtain the most economical thermal storage fluid and to optimize the size of TES system in order to minimize the use of fossil fuels and maximize profit. Parametric studies of reactor thermal power and CST's field area are conducted to determine their effect on the performance and configuration of the NR‐HES. Based on the current case study in terms of demand profiles, the results revealed that Therminol is the most economical thermal storage fluid for the present NR‐HES with a charging capacity and round‐trip storage efficiency of 237 268 MWh/year and 96%, respectively. The optimum Therminol storage tank size is evaluated to be 14 m in height and 10 m in diameter with a yearly average power cycle efficiency of ~36% and economic profit of 1 158 30 CAD/year. The parametric studies indicated that a larger TES size may decrease the usage of fossil fuel energy sources; however, it increases system total capital cost and decreases the power cycle efficiency and TES profit at given load. The results of this study indicate that an NR‐HES is a promising low‐carbon power generation system with the potential to meet the electricity and residential heat demand of remote communities.

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Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

“…Verification of the potential of CST model for transient simulations in compasion with Gemasolar power plant data 47 and Tehrani and Taylor model results 46 …”

Section: Concentrated Solar Tower Plantmentioning

confidence: 99%

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Nuclear renewable hybrid energy system assessment through the thermal storage system

Bayomy

Moore

2020

Int J Energy Res

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“…The results showed that the cavity structure can slightly make the heat flux distribution more uniform and the reflection energy loss can be therefore reduced. Tehrani and Taylor developed a thermal model of molten salt cavity receivers as well as validating the model with data from the Gemasolar power plant. Flesch et al presented 2 measures to reduce the convection heat loss of a cavity receiver: an air curtain and a partial window that covered a third of the aperture.…”

Section: Introductionmentioning

confidence: 99%

Cavity receiver thermal performance analysis based on total heat loss coefficient and efficiency factor

Zhang

Wang

et al. 2018

Int J Energy Res

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Summary A cavity structure effectively decreases the heat loss of a receiver. This paper applies the widely used collector analysis method to derive the total heat loss coefficient and efficiency factor for a cavity receiver. Based on the derived factors, this paper investigates the effect of different parameters, such as absorber surface temperature and emissivity, on thermal performance. The absorber surface emissivity significantly affects the total heat loss coefficient at high temperatures. The effect of the absorber surface temperature on the total heat loss coefficient is significant, while the effect of the ambient temperature on the total heat loss coefficient can be ignored. The present results can help to determine the testing conditions for the cavity receiver by using molten salt as the heat transfer fluid.

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Experimental study and performance testing of a novel parabolic trough collector

Chargui

Tashtoush

Awani

2021

Intl J of Energy Research

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Summary This work presents an experimental evaluation of a new design of a parabolic trough solar collector (PTC). To maximize the energy yield, a solar tracking system is implemented. The thermal performance of the PTC at three outdoor test methods is evaluated. The new design essentially affects the balloon, the trunk, the insulation, the inner reflector, the glass, the upper plane reflector, and the cover. The system performance with bi‐axial orientation and an absorber with a glass‐covered envelope is compared with two other designs of mono‐ and bi‐axial orientation without a glass‐covered envelope. The tests of the PTC with an aperture area of 2.88 m2 were conducted in Tunisian weather conditions, and the results are compared with similar systems already published data in the literature. A dynamic simulation with TRNSYS software is developed to evaluate the system performance based on experimental results. An economic study to evaluate the system's feasibility is conducted. The results showed that the new design achieved a maximum temperature of 179°C in comparison to 134 and 120°C for the mono‐ and bi‐axial orientation without a glass‐covered envelope, respectively. Furthermore, in the new PTC design, the useful daily energy gain increased by 33% and 15%, and the system thermal efficiency increased by 8.9% and 5.8% in summer and winter, respectively, in comparison to the case of mono‐axial orientation without a glass envelope. Besides, the maximum useful energy gain and the instantaneous thermal efficiency in the new design were 22.6 MJ and 73.45%, respectively, in comparison to 17.93 MJ and 67.41% for the mono‐axial orientation without a glass‐covered envelope. The gross payback period of the system was found to be 3.3 years with an NPV of €5257 over the lifetime of the system.

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Off-design simulation and performance of molten salt cavity receivers in solar tower plants under realistic operational modes and control strategies

Cited by 60 publications

References 48 publications

Nuclear renewable hybrid energy system assessment through the thermal storage system

Nuclear renewable hybrid energy system assessment through the thermal storage system

Cavity receiver thermal performance analysis based on total heat loss coefficient and efficiency factor

Experimental study and performance testing of a novel parabolic trough collector

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