Modeling, Construction, and Experimentation of a Compound Parabolic Concentrator with a Concentric Tube as the Absorber

Acuña, A.; Velázquez, N.; Sauceda, D.; Aguilar-Jiménez, J.A.

doi:10.1061/(asce)ey.1943-7897.0000416

Cited by 9 publications

(6 citation statements)

References 25 publications

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“…Thus, the benefit of radiation concentration is compromised by increased thermal losses. However, conduction and convection losses can be minimized by employing evacuated tube receiver (ETR) while radiation losses can be suppressed by applying selective coatings at the absorber surface which can also increase energy absorption [19]. An external CPC coupled with counterflow absorber with cylindrical fin enclosed in an evacuated glass tube was designed, developed, modeled and tested by Kim et al [20].…”

Section: Introductionmentioning

confidence: 99%

“…Energy collection in a CPC collector greatly depends on the absorption of concentrated radiations at the absorber surface which is affected by configuration, material and surface properties of collector components as well as manufacturing and alignment accuracy [19]. Ray tracing is a very useful tool to precisely estimate the flux distribution and amount of solar energy available at the receiver.…”

Section: Introductionmentioning

confidence: 99%

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Optical Performance Analysis of Single Flow Through and Concentric Tube Receiver Coupled with a Modified CPC Collector Under Different Configurations

et al. 2019

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Compound parabolic concentrating (CPC) collectors have great potential to provide sustainable solar thermal energy for many applications operating in the medium temperature range. This paper presents the design, development and performance evaluation of a modified CPC collector integrated with an evacuated tube receiver. The optical performance of the designed CPC paired with concentric tube receiver is compared with that of a CPC coupled with single flow through evacuated tube receiver for stationary installation in the East-West and North-South directions. Ray tracing simulations of different configurations demonstrate that CPC coupled with single flow through receivers suffer high gap losses, especially at smaller incidence angles which are considerably alleviated by a concentric tube receiver arrangement. East-West installation of CPC paired with concentric tube receiver exhibited superior optical performance than all other configurations. The yearly average optical efficiency of CPC with concentric tube receiver was 5% higher than that of a single flow through receiver within the acceptance angle. A 60% truncated CPC coupled with concentric tube receiver emerged as the most effective design, which was fabricated for experimental testing. The tests conducted under actual outdoor tropical environmental conditions demonstrated that the experimental optical efficiency reached to about 69% in the case of N-S installation and 66.5% in an E-W arrangement. The experimental results closely match the simulation outcomes, which indicate the proposed performance prediction technique as instrumental for selecting the most effective configuration of CPC collectors for medium temperature heat supply.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optical Performance Analysis of Single Flow Through and Concentric Tube Receiver Coupled with a Modified CPC Collector Under Different Configurations

et al. 2019

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“…where hcco is the convective heat transfer coefficient between the glass cover and the external environment (Acuna et al, 2017):…”

Section: Energy Balance For the I Th Element Of The Glass Covermentioning

confidence: 99%

“…Without such the sun-tracking system, the annual and daily average efficiency of these collectors will be relatively low, which in turn negatively affects the economy and practicability of their application (Ma et al, 2019). Acuna et al (2017) developed a compound parabolic concentrator, which uses a single concentric tube as an absorber. Field experiments demonstrated that the design increased the collector's efficiency by 5 %, compared to a conventional collector.…”

Section: Introductionmentioning

confidence: 99%

“…Their research created a foundation for following design optimization and heat transfer analysis studies for solar collectors. However, in the above model, authors assumed that such key components as glass cover, absorption tube wall and reflector were isothermal, which produced errors in operation predictions (Acuna, et al, 2017). Singh et al (2012) studied theoretically and experimentally the mechanism of natural convection heat transfer in the cavity of trough collectors.…”

Section: Introductionmentioning

confidence: 99%

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Numerical and experimental study of laboratory and full-scale prototypes of the novel solar multi-surface air collector with double-receiver tubes integrated into a greenhouse heating system

et al. 2020

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The laboratory and full-scale prototypes of the novel solar air collector were tested;  Fuel economy achieved in tests varies from 11% to 81% depending on weather conditions;  The increased concentration ratio of about 1.4 was obtained without a sun-tracking device;  The mathematical model of the collector was validated against experimental results;  The model was used to define the rational design parameters of the full-scale prototype.

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A review on recent advancements in performance enhancement techniques for low-temperature solar collectors

Gorjian

Ebadi

Calise

et al. 2020

Energy Conversion and Management

119

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Modeling, Construction, and Experimentation of a Compound Parabolic Concentrator with a Concentric Tube as the Absorber

Cited by 9 publications

References 25 publications

Optical Performance Analysis of Single Flow Through and Concentric Tube Receiver Coupled with a Modified CPC Collector Under Different Configurations

Optical Performance Analysis of Single Flow Through and Concentric Tube Receiver Coupled with a Modified CPC Collector Under Different Configurations

Numerical and experimental study of laboratory and full-scale prototypes of the novel solar multi-surface air collector with double-receiver tubes integrated into a greenhouse heating system

A review on recent advancements in performance enhancement techniques for low-temperature solar collectors

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