Properties of solid particles as heat transfer fluid in a gravity driven moving bed solar receiver

Nie, Fude; Cui, Zhiying; Bai, Fengwu; Wang, Zhifeng

doi:10.1016/j.solmat.2019.110007

Cited by 45 publications

(24 citation statements)

References 64 publications

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“…Wang et al (2017) carried out dynamic thermal performance experiments on a falling particle receiver of a single quartz tube and found that particle diameter, particle inlet temperature, particle flow, and type of quartz tube had a significant influence on the temperature of particles at the outlet. Nie et al (2019) tested in experiments the influence of particles made of nine different kinds of materials on receiver efficiency, with the results showing that three kinds of materials, namely, silicon carbide, gray ceramsite sand, and bauxite-cordierite ceramics with good solar weighted absorptivity and anti-sintering properties, could be taken as good candidates of heat absorption media in SPSR systems. Aiming at the falling process of a single particle inside a solar receiver, Wang et al (2016) found through numerical simulation that when a solid particle had a relatively large diameter, the resulting convection losses and radiation losses were smaller and the particle could reach a higher maximum temperature.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on influence of wind on thermal performance of a solid particle solar receiver

Wang

et al. 2022

Front. Energy Res.

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The effects of wind speed and wind attacking angle on the thermal performance of a solid particle solar receiver (SPSR) are studied by numerical simulation. In addition, the effect of aerowindow on the efficiency of the solar receiver is also explored. The results show that under different wind speeds and attack angles, wind can differently prevent hot air from flowing out and carry cold air into the solar receiver. These two effects compete with each other, resulting in the complex influence law of wind on receiver efficiency. Generally, the increasing wind speed will eventually lead to a negative effect on the thermal efficiency of the receiver. At the incident radiation aperture, the aerowindow formed by the air nozzle can effectively reduce convection heat loss and significantly improve the receiver efficiency. Under the simulation conditions of the present study, there is an optimal air jet velocity to maximize the protection effect of the aerowindow. The heat receiver efficiency increases from 41.7 to 58.2% when the wind is 2.5 m/s and the wind attacking angle is 135°. In the analysis of the energy balance inside the solar receiver, the proportion of radiation heat loss is about one-third, and it is not affected by the aerowindow. Thus, reducing radiation heat loss is very important for further improving the receiver’s efficiency of SPSR.

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Section: Introductionmentioning

confidence: 99%

Numerical study on influence of wind on thermal performance of a solid particle solar receiver

Wang

et al. 2022

Front. Energy Res.

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“…Natarajan and Hunt [20] experimentally studied the heat transfer between shear and plug flows, and the results show that, at a low flow rate, the average heat transfer coefficients were higher for the shear flows for comparable values of flow velocity close to the wall. Nie et al [21] analyzed the effects of particles with different thermophysical properties on the performance of the directly irradiated solid particle solar receiver with semi-annular flow channels. Yin et al [22] found that increasing particle diameter and solid void ratio can reduce the total heat transfer coefficient, and the change of channel width has a great influence on the total heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Gravity-Driven Granular Flow around the Vertical Plate: Effect of Pin-Fin and Oscillation on the Heat Transfer

et al. 2021

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In this paper, the heat transfer of pin-fin plate unit (PFPU) under static and oscillating conditions are numerically studied using the discrete element method (DEM). The flow and heat transfer characteristics of the PFPU with sinusoidal oscillation are investigated under the conditions of oscillating frequency of 0–10 Hz, amplitude of 0–5 mm and oscillating direction of Y and Z. The contact number, contact time, porosity and heat transfer coefficient under the above conditions are analyzed and compared with the smooth plate. The results show that the particle far away from the plate can transfer heat with the pin-fin of PFPU, and the oscillating PFPU can significantly increase the contact number and enhance the temperature diffusion and heat transfer. The heat transfer coefficient of PFPU increases with the increase of oscillating frequency and amplitude. When the PFPU oscillates along the Y direction with the amplitude of 1 mm and the frequency of 10 Hz, the heat transfer coefficient of PFPU is increased by 28% compared with that of the smooth plate. Compared with the oscillation along the Z direction, the oscillation along the Y direction has a significant enhancement on the heat transfer of PFPU.

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“…After being focused, the sunlight is directly irradiated in the receiver, and a large number of particles fall from the upper part of the receiver to form a particle curtain to absorb the sunlight [12]. In this heating process, the particle can theoretically be heated to above 1000 • C [13][14][15][16][17][18]. Compared with other solar receivers, the advantages of solid-particle solar receivers are [19]:…”

Section: Introductionmentioning

confidence: 99%

Study on Spectral Radiative Heat Transfer Characteristics of a Windowed Receiver with Particle Curtain

et al. 2021

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In this paper, a windowed receiver with a particle curtain is numerically simulated under full-spectrum conditions. The discrete phase model (DPM) is used to model the particle flow and interactions between the particle phase and the air phase. The scattering, absorption of the particle curtain and quartz glass window are considered in detail. The spectral characteristics of glass have an important influence on the heat transfer characteristics and the receiver efficiency. The results show that the quartz window can reduce the convective heat loss and the cavity re-radiation heat loss. Under the same conditions, the receiver efficiency of a windowed receiver with a particle curtain is increased by 11.9% compared with an aerowindow receiver with a particle curtain. Under the same mass flow, the particle curtain thickness and particle size have a non-negligible influence on the flow pattern and temperature distribution of the particle curtain. When the particle curtain thickness is low, the flow stability of the particle curtain is high; as the particle curtain thickness increases, the volume fraction of the particle curtain decreases, and the flow stability of the particle curtain decreases, which affects the shape of the curtain. The scattering and absorption characteristics of the particles are different, resulting in different net fluxes of incident radiation under the reflection of the particle curtain and the back wall. As the particle curtain thickness increases, the particle average exit temperature and the receiver efficiency show a trend of first increasing and then decreasing. When d = 30 mm, the incident radiation (G) at the position of the particle curtain is larger, the particle average exit temperature reaches 1156.72 K, and the receiver efficiency reaches 74.4%. Therefore, different particle sizes also have a significant impact on the flow pattern of the particle curtain and the radiation distribution inside it. In the range of 250–750 μm particle size, the particles average exit temperature reaches above 1150 K, and the receiver efficiency is above 72.6%. As the particle size increases, the particle average exit temperature, and the receiver efficiency show a trend of first decreasing and then increasing. When the particle size is 500 mm, the particle average exit temperature reaches 1175.8 K, and the receiver efficiency reaches 79.4%.

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Properties of solid particles as heat transfer fluid in a gravity driven moving bed solar receiver

Cited by 45 publications

References 64 publications

Numerical study on influence of wind on thermal performance of a solid particle solar receiver

Numerical study on influence of wind on thermal performance of a solid particle solar receiver

Numerical Investigation of Gravity-Driven Granular Flow around the Vertical Plate: Effect of Pin-Fin and Oscillation on the Heat Transfer

Study on Spectral Radiative Heat Transfer Characteristics of a Windowed Receiver with Particle Curtain

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