Comparative study of spiral and conical cavity receivers for a solar dish collector

Pavlović, Saša; Loni, Reyhaneh; Bellos, Evangelos; Vasiljević, Darko; Najafi, Gholamhassan; Kasaeian, Alibakhsh

doi:10.1016/j.enconman.2018.10.030

Cited by 87 publications

(23 citation statements)

References 42 publications

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“…It was observed that increasing aspect ratio caused the cavity performance to fall. A conical cavity receiver and a spiral cavity receiver coupled to a dish concentrator were investigated under energy and exergy aspects by Loni et al 20 They found that the conical cavity design is more efficient than the spiral design, and it is better in both thermal and optical terms. Yang et al 21 considered the convective cavity thermal losses, and they suggested a new air circulation method for reducing heat losses.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity

Rafiei

Loni

Ahmadi

et al. 2020

Energy Science & Engineering

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Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity

Rafiei

Loni

Ahmadi

et al. 2020

Energy Science & Engineering

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“…The exergetic efficiency ($12.29%) of the SDC increased by utilizing a Cu-oil based nanofluid and corrugated absorber. Pavlovic et al (2018b) examined spiral and conical cavities by using a thermal model. The thermal model was unified with an optical tool to properly simulate the SDC.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the receiver of a solar thermal dish collector with a dual layer, staggered tube arrangement, and multiscale diameter

Dulaimi

2020

Energy Exploration & Exploitation

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A new experimental model is proposed and tested to enhance the ability of receivers of solar thermal dish collectors in absorbing solar energy. An innovative model consisting of a dual layer, staggered arrangement, and multiscale diameter tubes is established. The enhancement augments the capability of the solar receiver of the collector to transform solar energy to thermal energy within the heat transfer fluid. The new design depends on the exploitation of the dead regions of the solar receiver, that is, surfaces with weak solar energy absorption which include the space between the pipes and the terminal sides of the pipes. The surface areas of the circular pipes in these regions are almost parallel to the solar energy radiation, which leads to a reduction in the ability of the tube to absorb solar energy. The design was validated through five receiver ([Formula: see text]) models for solar thermal dish collectors, in addition to the model base (which has single layer). Each model consists of a two-layer staggered arrangement and tubes with four different staggered diameter ratios [Formula: see text] between the two layers. Each of them has an octagonal shape and consists of three serial paths of copper tubes; each path consists of a bank of parallel tubes. The results show a noteworthy increase in the ability of the receiver to absorb solar energy and greater with model ([Formula: see text]) which [Formula: see text]equal (0.269) than for a plain tube collector. The enhancement leads to an increase in the thermal efficiency [Formula: see text]and exergetic performance [Formula: see text], that equal (78.8%) and (19.8%) respectively at (0.07 kg/s). Furthermore, the pressure difference, and efficiency evaluation criterion was estimated to evaluate dish collector receivers.

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“…In a similar fashion, two cavity receivers, the spiral tube and conical cavity, have been examined for various flow rates and working temperatures of oil as an operating fluid [36]. The collection efficiency of conical receiver is reported to be better than a spiral receiver.…”

Section: Introductionmentioning

confidence: 99%

“…The enhancement in receiver thermal efficiency is reported to be 5.63% and 40.45% at 100 °C and 200 °C, respectively. The pumping power and receiver wall temperature have been reported to be higher in case of spiral receiver, which reduces its performance [36].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on thermal performance characteristics of a solar cavity receiver

Bopche

Kumar

2019

Int J Energy Environ Eng

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The experimentation is carried out to examine the influence of receiver aperture/opening ratio (receiver's aperture diameter to the maximum diameter ratio, d/D), glass cover thickness and inclination angle of cavity receiver on its collection efficiency for various flow rates of ordinary water as a working fluid. Experimental tests have been conducted at lower incident energy, i.e., at lower cavity wall temperatures (less than 200 °C). The aperture ratio examined encompasses values as 0.46, 0.6, 0.7, and 0.93 for water flowing at flows of 0.8, 0.65, 0.5, and 0.4 LPM that corresponds to Reynolds numbers (Re) of 1880, 1525, 1175, and 938, respectively. The glazing thicknesses of 6, 4, and 2 mm were provided at an aperture. A modified cavity-type receiver is made inclined at angles 90°, 60°, 45°, and 30° (with 90° as down-facing receiver opening and 30° as close to sideway-facing of receiver opening). The tests have been conducted for cavity surface temperatures ranging from 90° to 180 °C. It is observed that an aperture ratio of 0.6 demonstrates maximum receiver performance for the values of Reynolds number studied, while the receiver performance exhibited reducing trend with reduction in receiver tilting angle from 90° to 30°.Keywords Modified cavity receiver · Aperture/opening ratio · Collection efficiency · Inclination Non-dimensional numbers d/D Ratio of receiver's aperture diameter to the receiver maximum diameter ∕D Glazing thickness ratio Gr Grashof number Nu Nusselt number N RC Radiation-conduction number = T 4 w D 2 (Tw−Tamb)kf Re Reynolds number T R Temperature ratio = T amb T w o Angle ratio Symbols Surface absorptivity δ Thickness (m) Emissivity of the surface Receiver collection efficiency or receiver performance parameter

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Comparative study of spiral and conical cavity receivers for a solar dish collector

Cited by 87 publications

References 42 publications

Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity

Sensitivity analysis of a parabolic trough concentrator with linear V‐shape cavity

Experimental investigation of the receiver of a solar thermal dish collector with a dual layer, staggered tube arrangement, and multiscale diameter

Experimental investigations on thermal performance characteristics of a solar cavity receiver

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