Thermal characteristics and thermal stress analysis of a superheated water/steam solar cavity receiver under non-uniform concentrated solar irradiation

Fang, Jiabin; Zhang, Canghong; Tu, Ning; Wei, Jinjia; Wan, Zhenjie

doi:10.1016/j.applthermaleng.2020.116234

Cited by 19 publications

(7 citation statements)

References 48 publications

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“…Platform geometry has the highest stress value of all convection results. Another study [36] in the literature stated that a similar stress concentration occurs on the platform surface and its edges. The applied convection reduced the stress and contact pressure.…”

Section: Resultsmentioning

confidence: 81%

Structural analysis of embedded hollow tubes on straight and curved platforms under thermal loads

Yavuz

2021

International Advanced Researches and Engineering Journal

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Tube systems are widely used in heat transfer and intensive research is being done on positioning tubes on a platform. The platform structure is constantly exposed to thermal changes under operating conditions and the resulting stresses cause damage to existing systems. In this study, 8 thin-walled tubes were positioned on flat and curved platforms that were widely used and the stress behavior under thermal effects was investigated. Finite element analysis was used, and steadystate thermal condition was considered in the numerical investigation. The effects of temperature difference between platform surfaces and the thermal conductivity at the tube surfaces were investigated. It has been determined that the stress on the platform is higher than the stress on the tubes and the increase in the temperature difference on the platform surfaces increases the stress drastically. The increased thermal conductivity coefficient on the tube surface reduced the stresses on the platform and increased fatigue performance. Flat platform has lower contact pressure and platform stresses and better fatigue behavior. Results are discussed in detail.

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Section: Resultsmentioning

confidence: 81%

Structural analysis of embedded hollow tubes on straight and curved platforms under thermal loads

Yavuz

2021

International Advanced Researches and Engineering Journal

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“…The leading cause of thermal stress is the wide circumference temperature gradient. When a small temperature difference in the radial direction occurs, high thermal stress can occur [ 48 ]. The first set of conditions assumed that the two ends of the receiver tube were encastred and no clips were used.…”

Section: Resultsmentioning

confidence: 99%

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Shatnawi

Lim

Ismail

et al. 2021

Heliyon

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The solar receiver is considered the cornerstone of the solar tower power system. In particular, it receives hightemperature heat flux rays, and extracts the maximum heat energy to be transferred to the heat transfer fluid, while minimising any thermal and mechanical stresses. Reducing the solar receiver size helps to reduce the loss of spillage; consequently, the thermal stress increases. Using a solar receiver with inserted triangular longitudinal fins enhances the heat transfer as well as strengthens the receiver tube. This study aims to optimise the number of fins, heat flux aiming point, heat transfer fluid, nanoparticle effect with molten salt as the base fluid, and type of receiver material. Non-uniform heat flux with the cosine and Gaussian effects have been considered. When the number of fins (N) increases, the maximum temperature (T max ) decreases and the heat transfer is enhanced. When N ¼ 20, T max ¼ 656.4 K and when N ¼ 1, T max ¼ 683.55, while the efficiency for N ¼ 1 is greater by 3% compared to when N ¼ 20. The cosine distribution of heat flux has a higher maximum temperature than the Gaussian distribution by 29% and is 102% higher in receiver efficiency. The thermal efficiency when the heat flux is aimed at the middle point of the receiver is higher by 10% compared with a lower or upper aiming point. Using Al 2 O 3 nanoparticles with a concentration of 0.5 wt.% increases the thermal efficiency by 14% more than when using pure molten salt when Re ¼ 38000. Using liquid sodium is not required to monitor the peak heat flux, and by adding triangular fins the displacement and thermal stress are 6.5 % lower compared to a smooth receiver.

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“…Under both boundaries, the molten salt nanofluid significantly reduced the peak temperature of the tube wall's outer and inner heated surface compared with the pure molten salt. Fang et al [36] investigated the thermal and mechanical performance of the superheated water/steam solar cavity receiver using an integrated simulation model. They concluded that the superheater had both the higher wall temperature and thermal stress, which was more crucial for the safe operation of the superheated water/steam solar cavity receiver.…”

Section: Concentrating Solar Powermentioning

confidence: 99%

Solar energy utilisation: Current status and roll-out potential

Taylor

et al. 2022

Applied Thermal Engineering

106

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Thermal characteristics and thermal stress analysis of a superheated water/steam solar cavity receiver under non-uniform concentrated solar irradiation

Cited by 19 publications

References 48 publications

Structural analysis of embedded hollow tubes on straight and curved platforms under thermal loads

Structural analysis of embedded hollow tubes on straight and curved platforms under thermal loads

An optimisation study of a solar tower receiver: the influence of geometry and material, heat flux, and heat transfer fluid on thermal and mechanical performance

Solar energy utilisation: Current status and roll-out potential

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