Modeling a thermoplate conical heat exchanger in a point focus solar thermal collector

Khalil, Imane; Pratt, Quinn; Spitler, Christopher; Codd, Daniel S.

doi:10.1016/j.ijheatmasstransfer.2018.10.041

Cited by 14 publications

(2 citation statements)

References 9 publications

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“…The hemispherical shape resulted in the best performance with a thermal efficiency of about 65%, followed by cubical and cylindrical shapes with 63% and 58% thermal efficiencies. Khalil et al 106 proposed an innovative dimpled thermoplate rolled as a conical receiver for a parabolic dish. The receiver was made from Inconel by laser welding and spot welding techniques.…”

Section: Cavity Receiversmentioning

confidence: 99%

Stationary point focus solar concentrators—A review

Reddy

Khan

2022

Intl J of Energy Research

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The innovation in concentrated solar power (CSP) systems is one of the many vital solutions to meet the ever-increasing global energy demands. Among various CSP systems, point focus solar concentrators can attain a higher concentration ratio and helps reduce the size of the receiver, resulting in higher operating temperatures, lower thermal losses, and higher system exergy. This article presents a review on a particular class of CSP systems known as stationary point focus solar concentrators, that is, point focus solar concentrators having a stationary receiver. They can be categorized as (a) Scheffler reflector, (b) Scheffler-type concentrator, (c) high temperature concentrator, (d) central tower receiver, and (e) CNRS solar furnace. Having a stationary receiver helps reduce the maintenance and simplifies the plumbing network for heat transfer fluid. However, low maintenance might be a tradeoff on the performance side. This review systematically collates the literature on stationary point focus solar concentrators. Also, the basics of solar angles and various solar tracking systems applicable to this class of CSP systems are covered. K E Y W O R D Scentral tower receiver, fixed focus solar concentrator, high-temperature concentrator, Scheffler reflector, Scheffler-type solar concentrator

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Section: Cavity Receiversmentioning

confidence: 99%

Stationary point focus solar concentrators—A review

Reddy

Khan

2022

Intl J of Energy Research

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“…This method allows thermal-optical calculation that deal with complex geometric shape and boundary conditions, enabling the approximation of variables in a volume or surface element that changed across the element. Thus, the variation of the field variables can be specified to increase degrees of approximations (An et al, 2005) (Li et al, 2015) (Rinker et al, 2018) (Khalil et al, 2019).…”

Section: Fig 4 Rac Solar Flux As a Function Of The First Width Ringmentioning

confidence: 99%

A three-dimensional ring-array concentrator solar furnace

et al. 2019

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A single ring-array concentrator solar furnace unit was firstly modeled analytically, and then optimized numerically by ZEMAX ® and ANSYS ® software, reaching a temperature of 3778 K, nearly equivalent to that of a medium size solar furnace with 3.14 m 2 collection area. A novel three-dimensional ring array concentrator solar furnace was subsequently proposed and analyzed. It consisted of five single ring array concentrators, forming a compact box-shaped solar furnace with an opening at the rear side for an easy access to a common focal spot in the center. Based on the edge-ray principle of non-imaging optics, 3.53 times higher concentration ratio was analytically calculated for this three-dimensional solar furnace, as compared to that of the medium size solar furnace, leading to significantly enhanced thermal and optical efficiencies. The temperature performance of the three-dimensional ring-array concentrator furnace as a function of receiver size and collector area was analyzed numerically and compared to that of the medium size solar furnace. For a 5.68 mm diameter spherical receiver and large collection area varying from 3.14 m 2 to 100 m 2 , 1.1 times gradual enhancement in the maximum attainable temperature was calculated for the ring array concentrator furnace. More importantly, its average and minimum temperatures were significantly improved by 870 K and 1140 K, respectively, as compared to that of the medium size solar furnace. With convection loss, the 3D RAC solar furnace also more efficient in attaining maximum temperature than that by the parabolic mirror furnace. In addition, the three-dimensional ringarray concentrator also presented a significant tracking error compensation capacity in relation to that with the medium size solar furnace.

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