An analysis of the heat loss and overheating protection of a cavity receiver with a novel movable cover for parabolic trough solar collectors

Liang, Hongbo; Fan, Man; You, Shijun; Xia, Junbao; Zhang, Huan; Wang, Yaran

doi:10.1016/j.energy.2018.06.059

Cited by 34 publications

(6 citation statements)

References 24 publications

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“…V-shape receiver with rectangular fins showed a better heat performance with higher outlet HTF temperature than using the absorber without fins. Further, the V-shape receiver indicated a potentially large improvement in future work [20] [21].…”

Section: Introductionmentioning

confidence: 93%

Thermal performance and design parameters investigation of a novel cavity receiver unit for parabolic trough concentrator

Mohamad

Ferrer

2021

Renewable Energy

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In this paper, we discuss an improved concept of for a cavity receiver unit for Solar Parabolic Trough Collectors (PTC) with the application of hot mirror coating (HMC) on a cavity aperture. This design aims to lessen radiant energy losses while operating at higher temperature by incorporating a variety of optically active layers. We present the theoretical background, which we derived in previous work, and the resulting implementation in a simulation code. We next discuss the layout and results of an experiment, which allowed us to make contact with the simulation with minor adjustments It was seen that the correspondence between the experiment and simulation results was encouragingly close (Chi squared p > 0.8 and p > 0.95), and we proceeded to investigate simulations of different receiver designs. Simulated outcomes for the temperature of the heat transfer fluid, temperature maps and efficiencies are presented. Our proposal indicates temperature related benefits when compared to other popular designs in terms of the heat transfer fluid temperature and the efficiency.

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Section: Introductionmentioning

confidence: 93%

Thermal performance and design parameters investigation of a novel cavity receiver unit for parabolic trough concentrator

Mohamad

Ferrer

2021

Renewable Energy

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“…Square-shaped cavity receivers have been easy to fabricate and have shown good optical and thermal performance. Workers [16,17] have proposed square pitch receivers having a trapezoidal cavity to overcome operation and maintenance issues associated with tube bundle receivers with experimental efficiency in the range of 34.18-48.55%. By incorporating a movable cover for PTC, they improved the heat reduction rate by 6.36-13.5%.…”

Section: Introductionmentioning

confidence: 99%

Cost effective non‐evacuated receiver for line‐concentrating solar collectors characterized by experimentally validated computational fluid dynamics model

et al. 2022

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Solar thermal technology promises to be a significant component of the future renewable energy mix. As the most mature solar thermal technology, parabolic trough concentrators (PTC) are the focus of considerable research. Conventional PTC use evacuated receivers, which contribute 30% of the solar field cost, not including significant failure (55% due to broken glass envelopes and 29% due to loss of vacuum arising due to failure of glass to metal seal). We report a non-evacuated receiver with a modular design for easier assembly and superior thermal performance for a PTC made of reflective strips of mirrored glass with a rim angle of 60 . The receiver performance is estimated using our own ray-tracing software and computational fluid dynamics (CFD) simulations using a model that we have validated with our own experimental rig. Critical parameters like the width of the mirror strip, the emissivity of solar selective coating, insulation material, and reflectivity of optical cavity walls have been analyzed in this study. A scaled-up model of the proposed novel receiver with a heat transfer fluid conduit diameter of 70 mm has been simulated to compare the performance with the commercial SCHOTT PTR ® 70.

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“…It was found that the experimental collector efficiency was in the range of 34.18-48.57%. Liang et al [7] also studied the effects of the movable cover on reducing heat loss and overheating protection of a cavity receiver for PTC. They concluded that the heat loss reduction rate varied from 6.36% to 13.55% when turning off the movable cover was applied.…”

Section: Introductionmentioning

confidence: 99%

Optical Performance Comparison of Different Shapes of Cavity Receiver in the Fixed Line-Focus Solar Concentrating System

Hai

Song

2022

Sustainability

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To optimize the fixed-focus solar concentrating system (FLSCS) and linear cavity receiver of better optical performance, the effects of receiver parameters (geometric shape, receiver position f, receiver internal surface absorptivity αab, and end reflection plane reflectivity ρr) on the relative optical efficiency loss ηre-opt,loss, the maximum value of the local concentration ratio Xmax, and the non-uniformity factor σnon were studied in the present study. The results showed that the increases of sun declination angle δ in the range of 0–8° have a weak effect on the ηre-opt,loss. The ηre-opt,loss are 2.25%, 2.72%, 12.69% and 2.62%, 3.26%, 12.85%, respectively, when the solar hour angle ω is 0°, 30°, 60° as δ = 0° and 8° for linear rectangular cavity receiver. The Xmax mainly depends on the energy flux distribution of first intercepted sunlight on the cavity absorber inner wall. Increasing the distance between the cavity absorber inner wall and the focal line Δf can affect the Xmax. The smaller the Δf, the greater the Xmax, and vice versa. The changing trend of σnon is basically consistent with that of the Xmax. When the f is 600, 625, 650, 675, 700 mm and the ω = 0°, the σnon are 0.832, 0.828, 0.801, 0.747, and 0.671, respectively, for linear rectangular cavity receiver. This work could establish the foundation for further research on the optical to thermal energy conversion in the FLSCS.

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An analysis of the heat loss and overheating protection of a cavity receiver with a novel movable cover for parabolic trough solar collectors

Cited by 34 publications

References 24 publications

Thermal performance and design parameters investigation of a novel cavity receiver unit for parabolic trough concentrator

Thermal performance and design parameters investigation of a novel cavity receiver unit for parabolic trough concentrator

Cost effective non‐evacuated receiver for line‐concentrating solar collectors characterized by experimentally validated computational fluid dynamics model

Optical Performance Comparison of Different Shapes of Cavity Receiver in the Fixed Line-Focus Solar Concentrating System

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