Numerical analysis of the influence of inclination angle and wind on the heat losses of cavity receivers for solar thermal power towers

Flesch, Robert; Stadler, Hannes; Uhlig, Ralf; Pitz‐Paal, Robert

doi:10.1016/j.solener.2014.09.045

Cited by 54 publications

(14 citation statements)

References 9 publications

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“…Samanes et al [18] compared different correlations for convective losses prediction and selected the Clausing's approach. A numerical analysis of convective losses of inclined cavity was proposed in [19]. They concluded that in no wind condition the Clausing model and the simulation results match very well (for both horizontal and inclined cavities).…”

Section: Contextmentioning

confidence: 99%

“…Negligible mixing occurs with the stagnant zone due to the change of the air density with temperature. According to [19], the Clausing's model allows evaluating the natural convection in the cavity. However, in the case of forced convection, i.e., when there is some wind, the cavity is split into three zones, stagnant and strong convection zones, as in the Clausing's model, but also with an intermediary transition zone, whose thickness depends on the aperture inclination and the wind velocity.…”

Section: Convective Lossesmentioning

confidence: 99%

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Shaping High Efficiency, High Temperature Cavity Tubular Solar Central Receivers

et al. 2020

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High temperature solar receivers are developed in the context of the Gen3 solar thermal power plants, in order to power high efficiency heat-to-electricity cycles. Since particle technology collects and stores high temperature solar heat, CNRS (French National Center for Scientific Research) develops an original technology using fluidized particles as HTF (heat transfer fluid). The targeted particle temperature is around 750 °C, and the walls of the receiver tubes, reach high working temperatures, which impose the design of a cavity receiver to limit the radiative losses. Therefore, the objective of this work is to explore the cavity shape effect on the absorber performances. Geometrical parameters are defined to parametrize the design. The size and shape of the cavity, the aperture-to-absorber distance and its tilt angle. A thermal model of a 50 MW hemi-cylindrical tubular receiver, closed by refractory panels, is developed, which accounts for radiation and convection losses. Parameter ranges that reach a thermal efficiency of at least 85% are explored. This sensitivity analysis allows the definition of cavity shape and dimensions to reach the targeted efficiency. For an aperture-to-absorber distance of 9 m, the 85% efficiency is obtained for aperture areas equal or less than 20 m2 and 25 m2 for high, and low convection losses, respectively.

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Section: Contextmentioning

confidence: 99%

Section: Convective Lossesmentioning

confidence: 99%

Shaping High Efficiency, High Temperature Cavity Tubular Solar Central Receivers

et al. 2020

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“…The boundary conditions of the inner surface of the cavity have often been simplified in different ways by many researchers. Flesch et al [3] and Xiao et al [4] did not consider the helical tube in the cavity when exploring the effects of wind on the thermal performance of the receiver. Their models were greatly simplified.…”

Section: Introductionmentioning

confidence: 99%

Optical Performance Analysis of Conical Cavity Receiver

Xiao¹,

Zhang²,

Zou³

2019

Proceedings of the 5th World Congress on New Technologies

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In this paper, the commercial software TracePro was used to investigate the effects of some factors on a conical cavity receiver, such as the conical angle, the number of loops of the helical tube, and the distance between the focal point of the collector and the aperture. These factors affect the optical efficiency, the maximum heat flux density, and the light distribution in the conical cavity. The optical performance of the conical receiver was studied and analyzed using the Monte Carlo ray tracing method. The results showed that the amount of light rays reaching the helical tube increases with the increasing of the conical angle, while the optical efficiency decreases and the maximum heat flux density increases.

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“…Flesch et al [19] numerically analyzed the impact of head-on and sideon wind on large cavity receivers with inclination angles ranging from 0°(horizontal cavity) to 90°(vertical cavity) and compared with the data published in the open literature. Yu et al [20] performed a numerical investigation on the heat transfer characteristics of the porous material used in the receiver of a CSP with different structure parameters.…”

Section: Introductionmentioning

confidence: 99%

Experimental study of the energy and exergy performance for a pressurized volumetric solar receiver

Zhu

Wang

et al. 2016

Applied Thermal Engineering

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h i g h l i g h t sPerformance of a pressurized volumetric solar receiver is experimentally discussed. Energy and exergy analysis is performed during a two-hour period in the morning. The efficiency of the solar receiver is maintained at around 60% under steady state. The highest exergy efficiency and energy efficiency is approximately 36% and 87%. a b s t r a c tThis article presents an experimental investigation of the heat transfer characteristics as well as energy and exergy performance for a pressurized volumetric solar receiver under variable mass flow rate conditions. During a two-hour period of continuous operation in the morning, the solar irradiance is relatively stable and maintained at approximately 600 W/m 2 , which is beneficial for analyzing the energy and exergy performance of the solar receiver. Experimental results show that the mass flow rate fluctuation has insignificant effect on the solar receiver outlet temperature, whereas the mass flow rate plays an important role in the solar receiver power, energy efficiency and exergy efficiency. The efficiency of the solar receiver is normally above 55% with the highest efficiency of 87%, and under steady state operating conditions the efficiency is maintained at approximately 60%. A very low value of the heat loss factor (0.014 kW/K) could be achieved during the current steady state operating conditions. The highest exergy efficiency is approximately 36%. In addition, as the temperature difference increases, the impact of the exergy factor increases. The highest exergy factor is 0.41 during the entire test.

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Numerical analysis of the influence of inclination angle and wind on the heat losses of cavity receivers for solar thermal power towers

Cited by 54 publications

References 9 publications

Shaping High Efficiency, High Temperature Cavity Tubular Solar Central Receivers

Shaping High Efficiency, High Temperature Cavity Tubular Solar Central Receivers

Optical Performance Analysis of Conical Cavity Receiver

Experimental study of the energy and exergy performance for a pressurized volumetric solar receiver

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