Combined heat loss analysis of solar parabolic dish – modified cavity receiver for superheated steam generation

Reddy, K. S.; Vikram, T. Srihari; Veershetty, G.

doi:10.1016/j.solener.2015.04.028

Cited by 53 publications

(18 citation statements)

References 15 publications

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“…connection with receiver geometries, dimensions and positions were investigated for different applications [18][19][20][21][22][23][24][25]. Amongst the literature [18][19][20][21][22][23][24][25], the most relevant have been chosen and will be discussed in the next paragraph.…”

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confidence: 99%

“…Their results showed that the losses of the cavity receiver are about 12% of the input energy to the aperture of the receiver and there is a small effect from the cavity geometry on the overall efficiency. Reddy et al [21] studied the effect of different factors such as the emissivity, inclination, insulation thickness and operating temperature on natural and forced convection and radiation heat losses of a modified hemispherical cavity receiver. Regarding the effect of the receiver inclination, they found that the minimum natural convection heat loss occurs when the open side of the receiver faces downwards, i.e.…”

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confidence: 99%

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The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

2016

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confidence: 99%

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confidence: 99%

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

2016

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“…They presented a Nusselt number for convection heat loss from the investigated cylindrical cavity receiver. Reddy et al [17] evaluated a dish concentrator using a modified cavity receiver using a numerical method. They predicted a Nusselt number for the combination of the convection and radiation heat losses from the investigated cavity receiver.…”

Section: Introductionmentioning

confidence: 99%

Thermal Evaluation of Cavity Receiver Using Water/Pg as the Solar Working Fluid

Kasaeian¹

2019

Journal of Thermal Engineering

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In this study, a parabolic dish concentrator with a cavity receiver was investigated. Water/ Propylene Glycol (PG) was used as the solar heat transfer fluid. Thermal numerical modelling was developed for prediction of the cavity receiver performance. The water/PG in different volume fractions (VF) of the PG was examined consist of 0%, 25%, 50%, and 55%. The working fluid inlet temperature is investigated in ranging 0 o C to 100 o C. The results revealed that the thermal efficiency and the cavity heat gain decreased by increasing the GP volume fraction. The pressure drop and pumping work demand decreased by increasing the working fluid inlet temperature as well as decreasing the PG volume fraction in the pure water. Consequently, the pure water had the lowest amount of the pressure drop among the investigated working fluids. The cavity surface temperature increased by increasing the working fluid inlet temperature as well as increasing the PG volume fraction in the pure water. Consequently, the application of the higher amount of PG is recommended for the Bryton cycle.

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“…They showed accurate and computationally cost effective predictions for fin-and-tube local temperature distributions, based on calculated non-uniform wall-fluid heat transfer coefficients captured by using advanced flow pattern maps based on wall wetting conditions for different flow regimes [42]. The modeling efforts for solar-driven tubular cavity receivers and reactors have been extensively reported [16,[43][44][45][46][47]. Martinek et al [16,44] developed a 3D steady-state model for a multi-tubular solar reactor for steam gasification of carbon using a hybrid Monte Carlo/ Finite Volume method for radiative heat transfer and a single-phase fluid flow model with volume-averaged mixture properties.…”

Section: Introductionmentioning

confidence: 99%

“…The approach is the following: a 1D two-phase flow model for the in-tube two-phase flow is coupled to a 3D heat transfer model of the receiver cavity, providing a simplified but accurate and computationally efficient model. A similar approach has been used by Zapata et al [48], one of the view reported modeling studies for solar-driven steam generation [46,48,49]. They used a 3D multi-mode heat transfer receiver model, however, they solved only a homogenous two-phase 1D model inside the absorber tube utilizing empirical correlations to predict the heat transfer between the tube surface and the working fluid without resolving the circumferential variations in the heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Modeling and design guidelines for direct steam generation solar receivers

et al. 2018

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• A computational model for solar receiver for direct steam generation is developed.• Experiments are conducted and used to validate the model.• Practical designs, operational conditions and material choices are investigated.• Model provides design tool for direct steam generation solar cavity receivers. A R T I C L E I N F OKeyword: Solar energy Multi-mode heat transfer modeling Two-phase flow modeling Solar receiver Steam generator Concentrated solar A B S T R A C T Concentrated solar energy is an ideal energy source for high-temperature energy conversion processes such as concentrated solar power generation, solar thermochemical fuel production, and solar driven high-temperature electrolysis. Indirectly irradiated solar receiver designs utilizing tubular absorbers enclosed by a cavity are possible candidates for direct steam generation, allowing for design flexibility and high efficiency. We developed a coupled heat and mass transfer model of cavity receivers with tubular absorbers to guide the design of solardriven direct steam generation. The numerical model consisted of a detailed 1D two-phase flow model of the absorber tubes coupled to a 3D heat transfer model of the cavity receiver. The absorber tube model simulated the flow boiling phenomena inside the tubes by solving 1D continuity, momentum, and energy conservation equations based on a control volume formulation. The Thome-El Hajal flow pattern maps were used to predict liquid-gas distributions in the tubular cross-sections, and heat transfer coefficients and pressure drop along the tubes. The heat transfer coefficient and fluid temperature of the absorber tubes' inner surfaces were then extrapolated to the circumferential of the tube and used in the 3D cavity receiver model. The 3D steady state model of the cavity receiver coupled radiative, convective, and conductive heat transfer. The complete model was validated with experimental data and used to analyze different receiver types and designs made of different materials and exposed to various operational conditions. The proposed numerical model and the obtained results provide an engineering design tool for cavity receivers with tubular absorbers (in terms of tube shapes, tube diameter, and water-cooled front), support the choice of best-performant operation (in terms of radiative flux, mass flow rate, and pressure), and aid in the choice of the component materials. The model allows for an indepth understanding of the coupled heat and mass transfer in the solar receiver for direct steam generation and can be exploited to quantify the optimization potential of such solar receivers.

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Combined heat loss analysis of solar parabolic dish – modified cavity receiver for superheated steam generation

Cited by 53 publications

References 15 publications

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

The optical efficiency of three different geometries of a small scale cavity receiver for concentrated solar applications

Thermal Evaluation of Cavity Receiver Using Water/Pg as the Solar Working Fluid

Modeling and design guidelines for direct steam generation solar receivers

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