Heat loss investigation from spherical cavity receiver of solar concentrator

Shewale, V. C.; Dongarwar, P.R.; Gawande, Rupesh R.

doi:10.1007/s12206-016-1040-6

Cited by 6 publications

(3 citation statements)

References 17 publications

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“…The energy losses are higher for head on wind direction as compared to side-on wind condition. The losses in case of side-on wind conditions are found even lesser as compared to no-wind condition [29].…”

Section: Introductionmentioning

confidence: 82%

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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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Section: Introductionmentioning

confidence: 82%

“…In case of spherical cavity-type receiver made up of copper tubing, the total losses depict a decreasing trend for rise of inclination angle [29]. These losses increase with wind velocity currents.…”

Section: Introductionmentioning

confidence: 97%

Experimental investigations on thermal performance characteristics of a solar cavity receiver

Bopche

Kumar

2019

Int J Energy Environ Eng

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“…Above 3 m/s, the convection cum total energy losses are reported independent of the direction of the wind at all receiver tilting angles except down-facing (0°) position (Prakash et al , 2009). Similar such numerical investigations have been carried out by Shewale et al (2016) for examining the effects of inclination angle, headwind and crosswind conditions on the heat losses from the spherical cavity receiver. They have observed that the maximum convective heat losses occur at 0° inclination with head-on wind condition and the minimum occurs with 90° inclination at zero wind speed.…”

Section: Introductionmentioning

confidence: 85%

Thermal performance analysis of a Solar parabolic dish concentrator system with modified cavity receiver

Kumar

Bopche

2021

WJE

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Purpose This paper aims to present the numerical models and experimental outcomes pertain to the performance of the parabolic dish concentrator system with a modified cavity-type receiver (hemispherical-shaped). Design/methodology/approach The numerical models were evolved based on two types of boundary conditions; isothermal receiver surface and non-isothermal receiver surface. For validation of the numerical models with experimental results, three statistical terms were used: mean of absolute deviation, R2 and root mean square error. Findings The thermal efficiency of the receiver values obtained using the numerical model with a non-isothermal receiver surface found agreeing well with experimental results. The numerical model with non-isothermal surface boundary condition exhibited more accurate results as compared to that with isothermal surface boundary condition. The receiver heat loss analysis based on the experimental outcomes is also carried out to estimate the contributions of various modes of heat transfer. The losses by radiation, convection and conduction contribute about 27.47%, 70.89% and 1.83%, in the total receiver loss, respectively. Practical implications An empirical correlation based on experimental data is also presented to anticipate the effect of studied parameters on the receiver collection efficiency. The anticipations may help to adopt the technology for practical use. Social implications The developed models would help to design and anticipating the performance of the dish concentrator system with a modified cavity receiver that may be used for applications e.g. power generation, water heating, air-conditioning, solar cooking, solar drying, energy storage, etc. Originality/value The originality of this manuscript comprising presenting a differential-mathematical analysis/modeling of hemispherical shaped modified cavity receiver with non-uniform surface temperature boundary condition. It can estimate the variation of temperature of heat transfer fluid (water) along with the receiver height, by taking into account the receiver cavity losses by means of radiation and convection modes. The model also considers the radiative heat exchange among the internal ring-surface elements of the cavity.

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Integrated optical-thermal model and deep learning technique to estimate the performance of a conical cavity receiver coupled solar parabolic dish collector

Rajan,

Reddy

2024

Energy Conversion and Management

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Heat loss investigation from spherical cavity receiver of solar concentrator

Cited by 6 publications

References 17 publications

Experimental investigations on thermal performance characteristics of a solar cavity receiver

Experimental investigations on thermal performance characteristics of a solar cavity receiver

Thermal performance analysis of a Solar parabolic dish concentrator system with modified cavity receiver

Integrated optical-thermal model and deep learning technique to estimate the performance of a conical cavity receiver coupled solar parabolic dish collector

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