Flexible electricity dispatch for CSP plant using un-fired closed air Brayton cycle with particles based thermal energy storage system

Rovense, Francesco; Reyes-Belmonte, Miguel A.; González-Aguilar, José; Amelio, Mario; Bova, Sergio; Romero, Manuel

doi:10.1016/j.energy.2019.02.135

Cited by 43 publications

(18 citation statements)

References 28 publications

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“…COPT = {COPT 0 , COPT 1 , COPT 2 , ..., COPT i , ..., COPT I } (14) In Equation ( 14), it can be seen that there is a particular COPT for each sub-period i. The procedure for the LOLE determination with daily COPT recalculation is as shown:…”

Section: Elcc With Variable Dispatchable Capacitymentioning

confidence: 99%

“…Significant technological advancements have taken place in energy storage [12], demand control [13], CSP [14], and even intermittent energy as possible sources of flexibility [15,16]. However, the models used for the planning and operation of power systems continue to a large extent using premises that, although representing well enough conventional thermoelectric technologies, do not facilitate the insertion of emerging technologies to perform the energy transition to renewable sources.…”

Section: Introductionmentioning

confidence: 99%

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Capacity Value from Wind and Solar Sources in Systems with Variable Dispatchable Capacity—An Application in the Brazilian Hydrothermal System

Amado

Pelegia²,

Sauer³

2021

Energies

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The most robust methods to determine the capacity contribution from intermittent sources combine load curve, variable generation profile, and dispatchable generators’ data to calculate any new inserted variable source’s capacity value in the power system. However, these methods invariably adopt the premise that the system’s dispatchable generators’ capacity is constant. That is an unacceptable limitation when the energy mix has a large share of hydroelectric sources. Hydroelectric plants are dispatchable sources with variable maximum power output over time, varying mainly according to the reservoirs’ level. This article develops a method that makes it possible to calculate the capacity value from renewable resources when the dispatchable generation units of an electric system have variable capacity. The authors apply the method to calculate the capacity value from solar and wind sources in Brazil as an exercise. By abandoning the hypothesis of constant dispatchable capacity, the developed approach is in principle extensible for other energy-limited resources, such as batteries and concentrating solar power (CSP). This can be a strategy to incorporate energy-limited capacity sources into the planning and operation models as reliable capacity sources.

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Section: Elcc With Variable Dispatchable Capacitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Capacity Value from Wind and Solar Sources in Systems with Variable Dispatchable Capacity—An Application in the Brazilian Hydrothermal System

Amado

Pelegia²,

Sauer³

2021

Energies

View full text Add to dashboard Cite

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“…Different process designs using fluidised bed heat exchanger (HEX) and particle TES are already presented in context with concentrating solar power applications [7][8][9]. In [10], also the design of the hopper for storing the particles and its insulation are examined.…”

Section: Introductionmentioning

confidence: 99%

FP-TES: A Fluidisation-Based Particle Thermal Energy Storage, Part I: Numerical Investigations and Bulk Heat Conductivity

et al. 2020

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Renewables should become more continuously available, reliable and cost-efficient to manage the challenges caused by the energy transition. Thus, analytic and numerical investigations for the layout of a pilot plant of a concept called Fluidisation-Based Particle Thermal Energy Storage (FP-TES)—a highly flexible, short- to long-term fluidised bed regenerative heat storage utilising a pressure gradient for hot powder transport, and thus enabling minimal losses, high energy densities, compact construction and countercurrent heat exchange—are presented in this article. Such devices in decentralised set-up—being included in energy- and especially heat-intensive industries, storing latent or sensible heat or power-to-heat to minimise losses and compensate fluctuations—can help to achieve the above-stated goals. Part I of this article is focused on geometrical and fluidic design via numerical investigations utilising Computational Particle Fluid Dynamics (CPFD). In the process a controlled transient simulation method called co-simulation of FP-TES is developed forming the basis for test bench design and execution of further co-simulation. Within this process an advanced design of rotational symmetric hoppers with additional baffles in the heat exchanger (HEX) and internal pipes to stabilise the particle mass flow is developed. Moreover, a contribution bulk heat conductivity is presented to demonstrate low thermal losses and limited needs for thermal insulation by taking into account the thermal insulation of the outer layer of the hopper.

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“…The CSP systems present a higher potential to store energy in comparison with PV systems [1]. As a result, CSP with a thermal energy storage (TES) system is considered the first choice to provide electricity on a large scale, even at nighttime or on cloudy days [2,3]. The principle behind CSP consists of the reflection of solar irradiation in a small area where heat is collected by a fluid and, subsequently, used in a Rankine cycle to generate steam.…”

Section: Introductionmentioning

confidence: 99%

Stability and Thermal Properties Study of Metal Chalcogenide-Based Nanofluids for Concentrating Solar Power

et al. 2019

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Nanofluids are colloidal suspensions of nanomaterials in a fluid which exhibit enhanced thermophysical properties compared to conventional fluids. The addition of nanomaterials to a fluid can increase the thermal conductivity, isobaric-specific heat, diffusivity, and the convective heat transfer coefficient of the original fluid. For this reason, nanofluids have been studied over the last decades in many fields such as biomedicine, industrial cooling, nuclear reactors, and also in solar thermal applications. In this paper, we report the preparation and characterization of nanofluids based on one-dimensional MoS2 and WS2 nanosheets to improve the thermal properties of the heat transfer fluid currently used in concentrating solar plants (CSP). A comparative study of both types of nanofluids was performed for explaining the influence of nanostructure morphologies on nanofluid stability and thermal properties. The nanofluids prepared in this work present a high stability over time and thermal conductivity enhancements of up to 46% for MoS2-based nanofluid and up to 35% for WS2-based nanofluid. These results led to an increase in the efficiency of the solar collectors of 21.3% and 16.8% when the nanofluids based on MoS2 nanowires or WS2 nanosheets were used instead of the typical thermal oil.

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Flexible electricity dispatch for CSP plant using un-fired closed air Brayton cycle with particles based thermal energy storage system

Cited by 43 publications

References 28 publications

Capacity Value from Wind and Solar Sources in Systems with Variable Dispatchable Capacity—An Application in the Brazilian Hydrothermal System

Capacity Value from Wind and Solar Sources in Systems with Variable Dispatchable Capacity—An Application in the Brazilian Hydrothermal System

FP-TES: A Fluidisation-Based Particle Thermal Energy Storage, Part I: Numerical Investigations and Bulk Heat Conductivity

Stability and Thermal Properties Study of Metal Chalcogenide-Based Nanofluids for Concentrating Solar Power

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