Numerical Investigation of the Temperature Distribution of a Solar Cavity Receiver Wall Using Finite Element Method

Kumar, Suneet; Bopche, Santosh B.

doi:10.1007/978-981-10-7206-2_4

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…The materials recommended for an annular plate closing partly the aperture of this receiver geometry are medium-grained extruded graphites (G-90 Graphite and Grade CS Graphite) and high-purity slip case silica. These explanations are supported by Kumar and Bopche (2018) in their numerical study.…”

Section: Introductionmentioning

confidence: 57%

Experimental evaluation study of collection efficiency of cavity receivers

Bopche

Lamba

2019

WJE

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Purpose This paper aims to present experimental work examining the effect of opening size on the collection efficiency of cavity-type receiver geometries, e.g. modified cavity and spherical cavity with single- as well as dual-stage water heating. The correlations, obtained using the experimentally obtained data, are helpful in designing of cavity receivers (modified and spherical geometry type) to be used in solar-power harnessing assignments/projects, for yielding better system performance. Design/methodology/approach The parameters of study encompass receiver opening or aperture ratios (d/D, ratio of diameter of opening to the maximum diameter of spherical cavity) of 0.4, 0.47, 0.533 and 0.6; flow Reynolds numbers of 938, 1,175, 1,525 and 1,880 with water as a coolant; and receiver inclination angles of 90, 60, 45 and 30° (with 90° as receiver-opening facing downward and 30° as receiver-aperture facing closer to sideway). A modified cavity receiver was examined for opening ratios of 0.46, 0.6, 0.7 and 0.93. The glass covers, with thickness 2, 4 and 6 mm, were positioned at the opening of cavity to mitigate the energy losses. Findings The experiments have been conducted at a lesser incoming radiative heat flux, for receiver cavity wall surface temperatures ranging from 90°C to 180°C. The collection efficiency values of both the receivers, modified cavity and spherical cavity types, are seen increasing with coolant flow rate and receiver tilt (inclination) angles, i.e. 30° → 90°. The collection efficiency exhibits maxima at an opening ratio of 0.533 in case of both single- and double-stage spherical cavity receiver. This value was observed as 0.6 for modified cavity receiver. The mathematical correlations developed for obtaining the collection efficiency values of modified cavity-type receiver, spherical cavity receiver with single stage and spherical cavity receiver with dual-stage water heating are given as ɳ=0.4667 Re0.0798dD0.1651 δ0.0281θ̇−0.011, ɳ=0.2317 Re0.124 dD1.265δ0.0192θ̇0.2914 and ɳ=0.1137 Re0.1715dD0.8702θ̇0.2757, respectively. Social implications The findings of the paper may be helpful in erecting concentrating solar collector systems for household water heating, concentrating solar-based power generation as well as for various agricultural applications. Originality/value The experimental investigations are fewer in the literature examining the combined geometrical influence on the efficiency of cavity receivers with single- and double-stage water heating provisions.

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Section: Introductionmentioning

confidence: 57%

Experimental evaluation study of collection efficiency of cavity receivers

Bopche

Lamba

2019

WJE

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“…Kumar and Bopche [38] have seen that the annular disc/ plate at an opening of modified cavity-type receiver showed maximum unsafe temperature as compared to a hemispherical cavity surface temperature, which is in vicinity of a coolant. It is referred as spillage of aperture lip (plate), which occurs due to constant exposure of concentrated radiation.…”

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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Numerical Investigation of the Temperature Distribution of a Solar Cavity Receiver Wall Using Finite Element Method

Cited by 2 publications

References 19 publications

Experimental evaluation study of collection efficiency of cavity receivers

Experimental evaluation study of collection efficiency of cavity receivers

Experimental investigations on thermal performance characteristics of a solar cavity receiver

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