Influence of longitudinal clips in thermal stresses and deflection in solar tubular receivers

Montoya, A.; Rodríguez-Sánchez, M.R.; López-Puente, J.

doi:10.1016/j.solener.2020.01.030

Cited by 13 publications

(5 citation statements)

References 28 publications

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“…The 1D thermal modeling approach given in Smith (1992) can be extended beginning with consideration of finite wall thickness and a modified approach for qi,C (Liao et al, 2014, et al), up to implementation of an analytical methodology for solution to 2D Laplacian conduction equation additionally accounting for local radiative heat exchange qo,R and convective losses qo,C at outer domain boundaries (Khanna et al, 2015). Then, regarding analytical modeling of stress and strain, Irfan and Chapman (2009); Yang and Lee (1971) Montoya et al (2020) this approach can be extended once more presenting an analytical expression of total axial stress σ z , acknowledging temperature dependence of E and α.…”

Section: Conclusion and Outlook: Real-time Monitoring Of Service Life...mentioning

confidence: 99%

“…The responsibility for the content of this publication 770 lies with the authors. Khanna et al, 2015;Logie et al, 2018;Marugán-Cruz et al, 2016;Montoya et al, 2018Montoya et al, , 2020, cf. (Boley and Weiner, 1960;Goodier, 1957;Timoshenko and Goodier, 1951) 2D (r, ϕ) quasistatic, T = T (r) (separate solution to axial stress σz) linear-thermoelastic const.…”

Section: Acknowledgementsmentioning

confidence: 99%

See 1 more Smart Citation

Monitoring of service life consumption for tubular solar receivers: Review of contemporary thermomechanical and damage modeling approaches

Hering

Binder²,

Schwarzbözl

et al. 2021

Solar Energy

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Section: Conclusion and Outlook: Real-time Monitoring Of Service Life...mentioning

confidence: 99%

Section: Acknowledgementsmentioning

confidence: 99%

Monitoring of service life consumption for tubular solar receivers: Review of contemporary thermomechanical and damage modeling approaches

Hering

Binder²,

Schwarzbözl

et al. 2021

Solar Energy

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“…Longitudinal supports play a key role when thermal stress and deflection are studied in tubes of solar central receivers. Its number and position along the tube determine the value and the location of the highest stress peak [4]. A reduced number of clips would make non-viable the use of generalized plane strain assumption, which is widely used in stress calculation in solar central receivers [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…In existing literature, clips shape influence in the mechanical behaviour of the tubes has not been addressed. The longitudinal supports has been assumed as punctual supports in the tube wall, restricting the displacement perpendicular to the axial direction, but allowing the rotation of the tube [4,7,8]. This approach, based on previous studies of parabolic through receivers, carried out by Khanna et al [9], underestimates the clip mechanical behaviour in solar central receivers.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal supports shape influence on deflection and stresses in solar receiver tubes

Montoya¹,

López-Puente²,

Santana³

2024

RE&PQJ

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Longitudinal supports have a key role in solar central receivers, preventing tubes from excessive deflection. In this work, its influence on tube deflection and thermo-mechanical stresses has been studied. In exiting literature, the longitudinal supports are not modelled when the behaviour of solar receiver tubes is studied. In this research, they have been considered developing numerical models using a finite element analysis software. To carry out the analysis, a new geometry of the metal sheet attached to the receiver tubes has been proposed. With this new shape, different cases have been studied, varying the separation between supports and their size to study its impact on stress and deflection in the tubes. Results have shown that extremely rigid supports may induce additional stress in the receiver tube. With the geometry considered in this research, supports do not cause additional mechanical stress in tubes. Small supports are preferred to bigger ones due to the stresses arisen in the own support..

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“…Eliminating the glass tube significantly reduces construction and maintenance costs. On the other hand, since the temperature in the circumferential direction of the absorber tube varies considerably, thermal stress is one of the main concerns of designers [20][21][22]. However, the narrow slit at the top of the absorber tube circumferentially provides a free displacement for the tube, and thermal stress is released.…”

mentioning

confidence: 99%

Design, Simulation and Optimization of a Novel Transpired Tubular Solar Air Heater

Nemati

2024

Energies

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In this paper, a novel tubular solar air heater is introduced. In this air heater, the hot boundary layer is drawn into the absorber tube and can provide thermal energy at moderate temperatures. Several different cases were simulated and a correlation was proposed to predict the collector’s effectiveness as a function Rayleigh number and Reynolds number. An equation was derived to find the effectiveness of this collector. Finally, a real case was studied with non-uniform solar flux distribution, as well as radiation heat loss. Good agreement was found between the results and those derived by the proposed analytical method. For different suction values, the first-law and the second-law efficiencies were calculated. Based on the exergy analysis, exergy destruction in absorption is the dominant factor that is unavoidable in low-temperature collectors. It was shown that there is an optimum suction value at which the second-law efficiency is maximized. At the optimum point, temperature rise can reach 54 K, which is hardly possible with a flat plate collector. Based on the exergy analysis, the relation between tube wall temperature and air outlet temperature in their dimensionless forms at the optimum working condition was derived, and it was shown that effectiveness at the optimum working condition is around 0.5. This means that the air temperature rise shall be half of the temperature difference between collector wall and the ambient temperatures. A high outlet temperature besides the low cost of construction and maintenance are the main advantages of this air heater. With such a high temperature rise, this type of collector can increase the use of solar energy in domestic applications.

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Influence of longitudinal clips in thermal stresses and deflection in solar tubular receivers

Cited by 13 publications

References 28 publications

Monitoring of service life consumption for tubular solar receivers: Review of contemporary thermomechanical and damage modeling approaches

Monitoring of service life consumption for tubular solar receivers: Review of contemporary thermomechanical and damage modeling approaches

Longitudinal supports shape influence on deflection and stresses in solar receiver tubes

Design, Simulation and Optimization of a Novel Transpired Tubular Solar Air Heater

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