On the influence of rotation on thermal convection in a rotating cavity for solar receiver applications

Wu, Wei; Amsbeck, Lars; Buck, Reiner; Waibel, Niklas; Langner, Philipp; Pitz‐Paal, Robert

doi:10.1016/j.applthermaleng.2014.03.059

Cited by 39 publications

(21 citation statements)

References 27 publications

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“…The results of this study offer a valuable design guideline for future manufacturing processes. Wu et al [9] developed a novel particle receiver concept for concentrating solar power (CSP) plants. Special attention was paid to the effect of rotation on convective flow in a cylindrical cavity with heated side walls for solar applications.…”

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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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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“…From the viewpoint of the heat transfer, in order to improve the heat transfer performances, Montes et al [10] estimated the optimal width of each module of the active surface, as well as the tubes diameter and thickness of each of them. In order to investigate the effect of rotation on natural convection losses that can influences the efficiency of the solar power receiver, an electrically heated rotating cavity was designed and built up by Wu et al [11]. According to the first law of thermodynamics, Boerema et al [12] investigated the effect of several engineering concepts on the resultant surface temperatures of tubular billboard receivers.…”

Section: Introductionmentioning

confidence: 99%

Optimal energy use of the collector tube in solar power tower plant

et al. 2016

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a b s t r a c tAs one of the most important parts of the solar power tower plant, the receiver plays an important role in the high-efficiency operation of the solar power tower system. Obtaining the maximum available energy in the receiver is highly desired in real-world operations. In this paper heat transfer and exergy transfer methods are used to model the energy transfer process in a collector tube. Different from common analysis methods, in order to ensure the molten salt to obtain the maximum available energy, an objective function is proposed to convert the task into a constrained optimization problem. The gravitational search (GS) algorithm is employed to search for the optimal solution of the proposed objective function. Numerical results indicate that the proposed optimization method can find the optimal operation parameters under different conditions. The heat transfer and exergy transfer characteristics along the collector tube under the optimal working condition are revealed, which quantifies the available energy along the collector tube, as well as reveals the location of energy degradation in the tube. The research findings will provide a beneficial reference for the effective use of the solar energy.

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“…Solar cavity receivers find frequent use in paraboloidal dish and central tower systems and can be subjected to large concentrations of solar flux. Efforts to increase the operating efficiency of this CST system component have included research on optimised receiver geometries (Asselineau, 2018;Pye et al, 2016;Shuai et al, 2008), utilising the natural variation of receiver surface temperature to reduce convection and radiation losses (Hughes et al, 2016), use of air curtains (Fang et al, 2019;Zhang et al, 2015), use of protective cowling as part of receiver structure (Cagnoli et al, 2019), use of partial or full windows on receiver aperture (Flesch, Robert et al, 2015;Maag et al, 2011;Uhlig et al, 2014), a variable aperture opening mechanism (Najafabadi et al, 2019;Van den Langenbergh et al, 2015), finned internal surfaces (Ngo et al, 2015) and cavity rotation (Wu, W. et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The resulting correlation was refined using a numerical parametric study of three cavity receivers. However, as the ensemble length was defined based on a limited set of geometries, its respective correlation has been reported to under-or over-estimate the convection loss in a number of cases (Samanes et al, 2015;Uhlig et al, 2014;Wu, W. et al, 2014). Jilte et al (2013) undertook a numerical investigation of seven different cavity geometries assuming isothermal boundary conditions and, after investigating the correlation between convection loss and different surface area definitions, proposed a correlation based on an inclination-dependent surface area specifically defined as the summation of the lateral and back wall surface areas below the horizontal free-shear plane and the area bounded by the cavity walls and the horizontal freeshear plane.…”

Section: Introductionmentioning

confidence: 99%

Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution

et al. 2020

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On the influence of rotation on thermal convection in a rotating cavity for solar receiver applications

Cited by 39 publications

References 27 publications

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

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

Optimal energy use of the collector tube in solar power tower plant

Experimental correlation of natural convection losses from a scale-model solar cavity receiver with non-isothermal surface temperature distribution

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