Development and Performance Assessment of a Moving Bed Heat Exchanger for Solar Central Receiver Power Plants

Baumann, Torsten; Zunft, Stefan

doi:10.1016/j.egypro.2015.03.085

Cited by 60 publications

(12 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The moving bed heat exchanger test infrastructure used for this study is shown in FIGURE 2 (left) and has been described in detail in [29]. It basically consists of a storage container for the granular material, a particle heat exchanger and a conveyor device.…”

Section: Methodsmentioning

confidence: 99%

Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation

Bartsch

Zunft

2019

Solar Energy

View full text Add to dashboard Cite

Moving bed heat exchangers are a central element in solar thermal power plants using granular heat transfer fluids. Their performance is determined by a complex granular flow field in the device. This calls for accurate simulation models forming the basis for novel design tools. In this study we propose a discrete element model (DEM) to calculate the dense granular flow field around the horizontal tubes of a moving bed heat exchanger. The simulation results are compared to measurement data using particle image velocimetry (PIV). In the upper part of the tube the model agrees well with the experiment, capturing the relevant flow phenomena like the stagnant zone on top of the tube. Below the tube, a void area is observed both in the experiment and the simulation. However, the PIV analysis of the experimental data doesn't resolve the void area and the associated flow phenomena due to the highly dynamic flow state, the inherent nature of PIV technique and additional disturbing effects in the setup. Therefore, the model can't be validated in the corresponding regions. Still, the deviations between simulation and experiment are confined to a very narrow region directly at the tube surface in the lower part of the tube. In the rest of the flow field, the model proves to be a reliable tool for further investigations and will be used in future studies.

show abstract

Section: Methodsmentioning

confidence: 99%

Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation

Bartsch

Zunft

2019

Solar Energy

View full text Add to dashboard Cite

show abstract

“…All the vertical channel walls are adiabatic, and the temperature of tube wall is kept at T tube = 287 K. Particles are generated at the entrance of the flow channel, and the particle inlet temperature is kept at T in = 773 K. All particles are driven by the gravity and have a dense filling in the flow channel. The particle velocity in the channel is controlled at the outlet [5], and the particle outlet velocity is kept constant along the vertical direction (z). As shown in Figure 1b, five different tubes are adopted for the study, including circular tube, elliptical tube, flat elliptical tube, elliptical-flat elliptical tube and flat elliptical-elliptical tube, where the perimeters of different tube cross sections are kept the same.…”

Section: Physical Modelmentioning

confidence: 99%

“…In the recent years, the world's energy and environmental problems have become more and more prominent, which makes it urgent to improve energy efficiency and develop sustainable energy techniques. Moving bed heat exchanger (MBHE), with the advantages of low cost, clean energy and wide particle size adaptation, is gradually applied in many high temperature waste heat recovery industries [1], such as slag [2], cement [3], coke [4] and concentrated solar power (CSP) [5]. For the MBHE, the granular flow inside is driven by the gravity, and the heat transfer is relatively lower [6] as compared with packed bed [7] or fluidized bed [8].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Heat Transfer in Gravity-Driven Particle Flow around Tubes with Different Shapes

et al. 2020

View full text Add to dashboard Cite

In the present paper, the heat transfer of gravity-driven dense particle flow around five different shapes of tubes is numerically studied using discrete element method (DEM). The velocity vector, particle contact number, particle contact time and heat transfer coefficient of particle flow at different particle zones around the tube are carefully analyzed. The results show that the effect of tube shape on the particle flow at both upstream and downstream regions of different tubes are remarkable. A particle stagnation zone and particle cavity zone are formed at the upstream and downstream regions of all the tubes. Both the stagnation and cavity zones for the circular tube are the largest, and they are the smallest for the elliptical tube. As the particle outlet velocity (vout) changes from 0.5 mm/s to 8 mm/s at dp = 1.72 mm/s, when compared with the circular tube, the heat transfer coefficient of particle flow for the elliptical tube and flat elliptical tube can increase by 20.3% and 15.0% on average, respectively. The proper design of the downstream shape of the tube can improve the overall heat transfer performance more efficiently. The heat transfer coefficient will increase as particle diameter decreases.

show abstract

“…Analyses of particle based heat exchangers can be divided into three levels: analytical solution, numerical simulation, and experimental procedure. In view of the complex geometry, the last two methods are generally applied in fluidized bed and shell and tube heat exchangers . Different from the two complicated types mentioned above, analytical solutions to the shell and plate heat exchangers have been proposed in recent literatures and led to interesting results.…”

Section: Introductionmentioning

confidence: 99%

Heat transfer model of a particle energy storage‐based moving packed bed heat exchanger

Yin

Zheng²,

Zhang

2019

Energy Storage

View full text Add to dashboard Cite

show abstract

Development and Performance Assessment of a Moving Bed Heat Exchanger for Solar Central Receiver Power Plants

Cited by 60 publications

References 4 publications

Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation

Granular flow around the horizontal tubes of a particle heat exchanger: DEM-simulation and experimental validation

Numerical Study of Heat Transfer in Gravity-Driven Particle Flow around Tubes with Different Shapes

Heat transfer model of a particle energy storage‐based moving packed bed heat exchanger

Contact Info

Product

Resources

About