Quentin Falcoz

Quentin Falcoz
French National Centre for Scientific Research | CNRS · Process Materials and Solar Energy Laboratory (PROMES)

PhD

About

69
Publications
16,679
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
767
Citations

Publications

Publications (69)
Article
The influence of fluid distribution on packed bed thermocline storage is studied experimentally on a 107 kWh prototype-scale setup. Three distributors are placed at the top of the tank, comparing uniform, central and peripheral geometries. A reference case is first considered and consists in a charge between 100 °C and 140 °C with an interstitial f...
Article
This work presents the design, experimental and numerical results related to a pilot-scale one-tank (thermocline) thermal energy storage (TES) combining latent and sensible heat storage materials with synthetic oil as heat transfer fluid (HTF). The layer of phase change material (PCM) is used to enhance the thermal performance of the TES. Alumina s...
Article
This study proposes a new seawater desalination process using concentrated solar energy. Compared with conventional desalination technologies, the proposed process produces tap water with high energy efficiency and a lower environmental impact. The proposed process is based on a new type of solar boiler using solar energy concentrated via a “beam-d...
Article
In order to reduce the amount of CO2 emissions associated with industrial boiling, the design of a new solar boiler operating with concentrated solar energy has been proposed and studied in the present work. A lab-scale solar boiler was built to show the feasibility of the concept through experiments, and a thermal model was then developed to study...
Article
To develop solar energy technology, the cavity receiver research is worth paying attention to. Instead of considering the cavity as a whole object, the surface of the cavity, exposed to solar radiation, is divided into five sections: the external front cover, the throat, the inner front cover, the pipe surface, and the bottom. Three critical parame...
Article
A concentrating solar system is established for the experimental investigation on a cylindrical cavity receiver. With a built-in helical pipe, the receiver is loaded at the focus point of a parabolic dish, driven by a double-axis tracking system. The helical pipe contains pressurized air as the heat transfer fluid (HTF), heated by concentrated sola...
Article
Thermocline storage performance is studied using a numerical model with three phases (fluid, solid, wall) and one dimension, which is then validated by comparison with experimental results. The impact of the interstitial fluid velocity on storage performance is presented and numerical simulations show the existence of an optimal velocity of 4⋅10⁻⁴...
Article
Compared with two tank thermal energy storage (TES) system, the single-tank thermocline (STTC) TES system provides a more cost-effective option for TES systems with low-cost solid filler, and it is progressively becoming an important research topic. In this study, analytical approach solutions derived from the one-dimensional two-phase (1D-2P) with...
Article
Full-text available
Although work has been done to understand the sintering behavior and properties of Municipal Waste Incinerator Bottom Ashes to produce sintered (Bethanis et al. in Ceram Int 28:881–886, 2002; Cheeseman et al. in Resour Conserv Recycl 43:147–162, 2005; Bourtsalas et al. in Waste Manag 45:217–225, 2014; Taurino et al. in J Eur. Ceram Soc 37:323–331,...
Article
This work presents the first use of Cofalit® (vitrified asbestos-containing waste) as a solid filler in pilot-scale thermocline thermal energy storage (TES). The thermocline size is 4 m³ connected to the MicroSol-R installation at the PROMES research facility in Odeillo, France. The study compares the thermal performance of the thermocline filled w...
Article
Full-text available
Pressed plates ceramics made of gross-milled bottom ashes and waste clay, were made using technologies available in the building bricks and tiles industry, to ease production upscaling at low-cost. These sintered ceramics are intended for use as a high-temperature thermal energy storage material. They represent an alternative to the waste-based pet...
Article
The performance of a solar conical receiver greatly influences the concentrated solar power (CSP) system. It is worthy to devote efforts on performance optimization for a solar conical receiver with a built-in helical pipe. A comprehensive investigation on the whole solar-heat conversion process is significant. Using a combined optics and heat tran...
Article
Full-text available
The optical performance of a receiver has a great influence on the efficiency and stability of a solar thermal power system. Most of the literature focuses on the optical performance of receivers with different geometric shapes, but less research is conducted on the effects of critical geometric parameters. In this paper, the commercial software Tr...
Article
In consideration of geometric parameters, several researches have already optimized the thermal efficiency of the cylindrical cavity receiver. However, most of the optimal results have been achieved at a fixed solar radiation. At different direct normal irradiance (DNI), any single optimal result may not be suitable enough for different regions ove...
Article
A high-temperature air/ceramic thermocline packed-bed heat storage pilot was designed and built to measure the effects of operating parameters and quality of the heat resource on its performance, with a horizontal duct of square section. The influence of inlet air flow rate during the discharging phase and the impact of a degraded inlet heat resour...
Conference Paper
Full-text available
Two liquid/solid thermocline heat storage systems are compared. Both setups have similar size and operate with thermal oil as heat transfer fluid but one consists of a packed bed of alumina spheres with a void fraction of 0.485, while the other consists of a packed bed of rock and sand with a void fraction of 0.270. A dimensionless approach based o...
Article
A simulation of a 50 MWe power plant with thermocline tank as storage shows that there is no deterioration of the thermocline performance with cycling (successive charges and discharges), because no temperature threshold has to be taken into account during charges. Indeed, the best control strategy when the thermocline outlet fluid temperature incr...
Article
In the present study, geometry optimization of a phase change material (PCM) heat storage system is presented. The existing PCM-fins heat exchanger system works at the back side of a solar receiver in order to minimize the effect of the solar radiation fluctuations inside the cavity. As initially designed, the system does not accomplish the expecte...
Article
PROMES-CNRS laboratory has recently inaugurated a small scale parabolic trough power plant, named “MicroSol-R”, for research activities. The platform is aimed to test and improve various technologies including thermal energy storage, power conversion cycle, heat transfer fluid and collectors. This article highlights the experimental and numerical i...
Article
Regarding energy storage in concentrated solar power plants, thermocline technology is considered to be a cost effective but less efficient solution than conventional two-tank. However, thermocline storage charge and discharge are usually stopped when the varying outlet temperature reaches an arbitrarily chosen value. It is shown here that the stop...
Article
Full-text available
Concentrating solar power (CSP) represents a powerful, clean, endless, and reliable source of energy. Which, the parabolic trough collector (PTC) system was the first CSP technology to date, thus it is the most developed and most commonly replicated system. The optical analysis of a solar concentrator represents a major interest to evaluate the per...
Article
This work aims to predict the general performances of a pilot parabolic trough collector during transient periods. To do so, a one-dimensional thermal model has been developed. It has been validated with experimental results from two different experimental setups, in steady-state conditions, with a transmitted power maximum error of 3.4%. Since the...
Conference Paper
Full-text available
A thermocline thermal energy storage tank consists in using one single tank to store sensible heat. At almost any time, three zones coexist in the tank: a hot fluid zone at the top, a cold fluid zone at the bottom, and an intermediate zone called thermocline. Filling the tank with solid materials enables to reduce cost and to maintain the thermal s...
Conference Paper
A solar cavity receiver model for the dish collector system is designed in response to growing demand of renewable energy. In the present research field, no investigations into the geometric parameters of a cavity receiver have been performed. The cylindrical receiver in this study is composed of an enclosed bottom at the back, an aperture at the f...
Article
Full-text available
Compatibility tests were conducted between synthetic oil and potential solid filler materials in a thermocline tank built at the PROMES-CNRS laboratory. These experiments consisted of placing the oil and the solid materials together in small crucibles (2.3 L) and performing compatibility tests at 300 °C and accelerated ageing tests at 330 °C for 50...
Article
Full-text available
The major advantage of concentrating solar power before photovoltaic is the possibility to store thermal energy at large scale allowing dispatchability. Then, only CSP solar power plants including thermal storage can be operated 24 h/day using exclusively the solar resource. Nevertheless, due to a too low availability in mined nitrate salts, the ac...
Conference Paper
Direct thermocline thermal energy storage is the cheapest sensible thermal energy storage configuration. Indeed, a thermocline tank consists in one tank instead of two and reduces costs. Thermocline thermal energy storages are often filled with cheap solid materials which could react with the heat transfer fluid in the case of incompatibility. PROM...
Article
The interest for hybrid solar gas-turbine systems (HSGT) in solar power tower plant technologies is growing. This is due to the high conversion efficiency and to the low water consumption that are achieved when a combined cycle is implemented. This paper presents a simulation tool which is dedicated to the performance analysis a hybrid solar gas tu...
Article
This paper demonstrates the feasibility of using several post-industrial ceramics as filler materials in a direct thermocline storage configuration. The tested ceramics, coming from several industrial processes (asbestos containing waste treatment, coal fired power plants or metallurgic furnaces) demonstrate relevant properties to store thermal ene...
Article
Full-text available
Solid sensible heat storage is an attractive option for high-temperature storage applications in terms of investment and maintenance costs. Typical solid thermal energy storage systems use a heat transfer fluid to transfer heat as the fluid flows through a tubular heat exchanger embedded in the solid storage material. A one-dimensional unsteady mod...
Article
Full-text available
The interest for hybrid solar gas-turbine systems (HSGT) in solar tower plant technologies is growing This is due to the high conversion efficiency and to the low water consumption that are achieved when a combined cycle is implemented. This paper presents a simulation tool which is dedicated to the performance analysis of the top cycle featuring a...
Article
Full-text available
Thermocline storage may be, today, the cheapest way to store solar thermal energy at high temperatures. Several estimations lead to a potential cost reduction of 35% compared to a two tank configuration while retaining a good efficiency. Thermocline tanks, in packed bed configurations, are mostly designed using filler materials to reduce the requir...
Article
Full-text available
The work addresses the issue of fast variations of temperature of a central solar receiver under cloud covering. A specific attention is paid to the situation of Hybrid Solar Gas Turbine (HSGT) systems using pressurized air as Heat Transfer Fluid (HTF), as it is considered in the Pegase project (France). A Thermal Energy Storage (TES) unit integrat...
Article
Full-text available
Thermal Energy Storage (TES) is the key for a stable electricity production in future Concentrated Solar Power (CSP) plants. This work presents a study on the thermal protection of the central receiver of CSP plant using a tower which is subject to considerable thermal stresses in case of cloudy events. The very high temperatures, 800 °C at design...
Conference Paper
Full-text available
An innovative gravity-fed combined solar receiver/storage system for thermal energy storage (TES) is presented for concentrated solar power (CSP) plants with beam down tower configuration. Sand particles are employed as heat collector, heat transfer and thermal energy storage media in contrast to conventionally used materials such as molten salts o...
Conference Paper
Full-text available
An energy and exergy analysis of a novel solid particle solar receiver is presented based on experimental data and well-known correlations found in the literature. A sand sample from the deserts of the United Arab Emirates has been chosen as the solar absorber and heat carrier material. The intent of the receiver is to be used as a part of a sensib...
Article
The attraction of solar energy is greatly enhanced by the possibility of it being used during times of reduced or non-existent solar flux, such as weather induced intermittences or the darkness of the night. Therefore optimizing thermal storage for use in solar energy plants is crucial for the success of this sustainable energy source. Here we pres...
Article
The emissions of heavy metals during incineration of Municipal Solid Waste (MSW) are a major issue to health and the environment. It is then necessary to well quantify these emissions in order to accomplish an adequate control and prevent the heavy metals from leaving the stacks. In this study the kinetic behavior of Cadmium during Fluidized Bed In...
Article
Exploitation of forest resources for energy production includes various methods of biomass processing. Gasification is one of the ways to recover energy from biomass. Syngas produced from biomass can be used to power internal combustion engines or, after purification, to supply fuel cells. Recent studies have shown the potential to improve conventi...
Article
A particulate model was developed for municipal solid-waste incineration in a fluidized bed combining solid-waste-particle combustion and heavy metal vaporization from the burning particles. Based on a simpler, isothermal version presented previously, this model combines an asymptotic-combustion model for carbonaceous-solid combustion and a shrinki...
Article
The fate of heavy metals contained in municipal solid waste is of major concern in the incineration process. This study is the first attempt to analyze the kinetic behavior of Cd, Pb, and Zn in a waste bed burning on the grate of an incinerator. The vaporization rates of the three heavy metals were derived from laboratory experiments. The kinetic l...
Article
The accumulation of toxic metals generated by coal-fired power stations presents a serious threat to the environment. The volatilization behavior of two representative metals (Cd and Zn), and the influence of temperature were investigated during coal combustion. An inductively coupled plasma atomic emission spectrometric (ICP-AES) method was develo...
Article
An inductively coupled plasma atomic emission spectrometer was developed to continuously analyze the concentrations of cadmium and zinc in order to track the metal release process during coal combustion. The optimum values of the gas flows for the 1400 W power generator are 0.03 L/min for the sample gas and 0.16 L/min for Ar. This system was implem...
Article
Metal emissions from waste incineration plants become a great environmental concern because of their toxicity for both human health and environment. Metals are not destroyed by high-temperature thermal treatment and some vaporized metals may be emitted. It is thus essential to understand the release mechanism of metals during high-temperature waste...
Article
This study aims to develop a particulate model combining solid waste particle combustion and heavy metal vaporization from burning particles during MSW incineration in a fluidized bed. The original approach for this model combines an asymptotic combustion model for the carbonaceous solid combustion and a shrinking core model to describe the heavy m...
Article
The kinetic rate laws of heavy metal (HM) vaporization from municipal solid waste during its incineration were studied. Realistic artificial waste (RAW) samples spiked with Pb, Zn, and Cd were injected into a fluidized bed reactor. Metal vaporization wastracked by continuous measure ofthe above metals in exhaust gases. An inverse model of the react...
Article
A method for analyzing on-line the vaporized metals in an exhaust gas was developed by coupling an ICP (Inductively Coupled Plasma) spectrometer to the gas outlet of both a fixed bed reactor and a fluidized bed reactor. A calibration device was set up and implemented. It involves a standard gas synthesis protocol to obtain quantitative data. The ca...
Article
Full-text available
A method was developed for online analysis of vaporized cadmium in any exhaust gas by coupling an inductively coupled plasma spectrometer to the gas outlet of a laboratory fluidized bed reactor. A calibration device was set up and implemented, and a standard gas synthesis protocol was developed to obtain quantitative data. The calibration method wa...
Article
Solid samples, either of realistic waste model or coal, and spiked with Cd, Pb or Zn, were burned in an electrically-heated fluid bed reactor coupled to a customized ICP spectrometer, for on-line analysis of vaporized metals. For waste samples, a single kinetic law (whatever the metal), predicting the vaporization characteristic time and the time c...

Network

Cited By

Projects

Projects (6)
Archived project
Use UAE desert sand as high temperature direct absorption particle solar receiver