Optical and thermal analysis of different cavity receiver designs for solar dish concentrators

Bellos, Evangelos; Bousi, Erion; Tzivanidis, Christos; Pavlović, Saša

doi:10.1016/j.ecmx.2019.100013

Cited by 43 publications

(39 citation statements)

References 72 publications

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“…The diameter of the spot is approximately 69.8 mm, which is highly consistent with the theoretical calculation result of Equation (9). The simulation results show that the total energy of the test plane is 3436 W, and the error is 0.09% compared with the theoretical results of Equation (11), and the two results are very close to each other. To summarize, in this paper, using Optis-Works software for the simulation calculations is reliable.…”

Section: Methodology and Model Validationsupporting

confidence: 82%

“…In this paper, l is the average distance of the light radiation pass-ing through the quartz window, which is calculated as 9.8 mm. Through Equations (10) and (11), it can be calculated that the total energy in the test plane is 3433 W.…”

Section: Methodology and Model Validationmentioning

confidence: 99%

“…Yan et al [9] proposed a mirror rearranging method for a parabolic dish concentrator and a novel discrete dish concentrator [10], which significantly improved the flux uniformity of the cavity receiver. Evangelos et al [11] proposed cylindrical, rectangular, spherical, conical, and cylindrical-conical receivers, and the research shows that the cylindrical-conical receiver has the best flux uniformity. Shuai et al [12] designed a pear-like cavity receiver, which has better flux uniformity than a hemispherical receiver.…”

Section: Introductionmentioning

confidence: 99%

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Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Nie

Peng

Yan

et al. 2020

International Journal of Photoenergy

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A nonuniform and high-strength heat flux load would reduce the working efficiency, safety, and in-service life of a cavity receiver. Four types of concave quartz windows, including conical, spherical, sinusoidal, and hyperbolic tangent, were proposed to be used in the cylindrical cavity receiver of a solar dish concentrator system, which can improve the flux uniformity and reduce the peak concentration ratio of the receiver. For each concave quartz window, 36 structural schemes were offered. Based on the Monte Carlo ray-tracing method, the results showed that the nonuniformity coefficient of the receiver was 0.68 and the peak concentration ratio was 1320.21 by using a plane quartz window. At the same time, when the receiver is in the best optical performance, it is the receiver with sinusoidal, conical, spherical, and hyperbolic tangent quartz windows, respectively. The optical efficiency of the receiver with the above four types of quartz windows was basically the same as that of the receiver with the plane quartz window, but their nonuniformity coefficients were reduced to 0.31, 0.35, 0.36, and 0.39, respectively, and the peak concentration ratio was reduced to 806.82, 841.31, 853.23, and 875.89, respectively. Obviously, the concave quartz window was better than the plane quartz window in improving the flux uniformity. Finally, a further study on the sinusoidal quartz window scheme of all of the above optimal parameter schemes showed that when the installation position of the receiver relative to the dish concentrator was changed, the flux uniformity of the receiver could continue to improve. When the surface absorptivity of the receiver was reduced, the optical efficiency would be reduced. For the parabolic dish concentrator with different focal distance, the concave quartz window can also improve the uniformity of the flux distribution of the cylindrical cavity receiver.

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Section: Methodology and Model Validationsupporting

confidence: 82%

Section: Methodology and Model Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Nie

Peng

Yan

et al. 2020

International Journal of Photoenergy

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“…It was also concluded that mass flow rate and work output increased for maximum solar radiation and smaller tube diameter. Bellos et al 9 investigated five different solar dish concentrator cavity receiver designs from thermal and optical points of view. The cylindrical-conical-shaped receiver was the best among the examined cases, followed by the conical and spherical shapes.…”

Section: Introductionmentioning

confidence: 99%

Thermo‐environmental investigation of solar parabolic dish‐assisted multi‐generation plant using different working fluids

et al. 2020

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The present study investigates the performance of a multi-generation plant by integrating a parabolic dish solar collector to a steam turbine and absorption chiller producing electricity and process heat and cooling. Thermodynamic modeling of the proposed solar dish integrated multi-generation plant is conducted using engineering equation solver to investigate the effect of certain operating parameters on the performance of the integrated system. The performance of the solar integrated plant is evaluated and compared using three different heat transfer fluids, namely, supercritical carbon dioxide, pressurized water, and Therminol-VPI. The useful heat gain by collector is utilized to drive a Rankine cycle to evaluate the network output, rate of process heat, cooling capacity, overall energetic, and exergetic efficiencies as well as coefficient of performance. The results show that water is an efficient working fluid up to a temperature of 550 K, while Therminol-VPI performs better at elevated temperatures (630 K and above). Higher integrated efficiencies are linked with the lower inlet temperature and higher mass flow rates. The integrated system using pressurized water as a heat transfer fluid is capable of producing 1278 and 832 kW of power output and process heat, respectively, from input source of almost 6121 kW indicating overall energy and exergy efficiencies of 34.5% and 37.10%, respectively. Furthermore, multi-generation plant is evaluated to assess the exergy destruction rate and steam boiler is witnessed to have the major contribution of this loss followed by the turbine. The exergo-environmental analysis is carried out to evaluate the impact of the system on its surroundings. Exergo-environmental impact index, impact factor, impact coefficient, and impact improvement are evaluated against increase in the inlet temperature of the collector. The single-effect absorption cycle is observed to have the energetic and exergetic coefficient of performances of 0.86 and 0.422, for sCO 2 operating system, respectively, with a cooling load of 228 kW.

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“…Measuring the forced convection for an open cylindrical cavity receiver and optimizing the cavity by considering various parameters like the receiver efficiency, lifetime and reliability for a solar tower were reported in [13][14] respectively. Some interesting studies on the optical and thermal analysis both; experimentally and numerically at various operating conditions and working fluids, of a spiral cavity receiver with a parabolic dish concentrator were conducted by Pavlovic et al [15][16][17]. The overall conclusion indicated that water is the best working fluid for low-temperature values due to its high heat transfer coefficient.…”

Section: Introductionmentioning

confidence: 99%

Characterization of a micro thermal cavity receiver – Experimental and analytical investigation

Daabo

Bellos

Pavlović

et al. 2020

Thermal Science and Engineering Progress

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Optical and thermal analysis of different cavity receiver designs for solar dish concentrators

Cited by 43 publications

References 72 publications

Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Improvement in the Flux Uniformity of the Solar Dish Concentrator System through a Concave Quartz Window

Thermo‐environmental investigation of solar parabolic dish‐assisted multi‐generation plant using different working fluids

Characterization of a micro thermal cavity receiver – Experimental and analytical investigation

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