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Research Papers

Experimental Investigation on Heat Losses From Differentially Heated Cylindrical Cavity Receiver Used in Paraboloid Concentrator

[+] Author and Article Information
Ravindra D. Jilte

Professor
School of Mechanical Engineering,
Lovely Professional University,
Phagwara 144411, Punjab, India
e-mail: rdjilte@gmail.com

Jayant K. Nayak

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, Maharashtra, India
e-mail: jknayak@iitb.ac.in

Shireesh B. Kedare

Professor
Department of Mechanical Engineering,
Indian Institute of Technology Bombay,
Mumbai 400076, Maharashtra, India
e-mail: sbkedare@iitb.ac.in

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING: INCLUDING WIND ENERGY AND BUILDING ENERGY CONSERVATION. Manuscript received April 11, 2016; final manuscript received February 24, 2017; published online April 25, 2017. Assoc. Editor: Mary Jane Hale.

J. Sol. Energy Eng 139(3), 031013 (Apr 25, 2017) (13 pages) Paper No: SOL-16-1156; doi: 10.1115/1.4036255 History: Received April 11, 2016; Revised February 24, 2017

In the present study, an experimental testing facility is created to analyze the heat losses from the cylindrical solar cavity. Tests are carried out under the temperature range from 225 °C to 425 °C for a cavity inclination from θ = 0–90 deg in steps of 30 deg. It is observed that for off-flux investigation of solar cavity receiver, near isothermal wall temperature condition can be realized with the differential heating arrangement. The total loss is found to be the highest when the cavity aperture is positioned at sideways (θ = 0 deg). It decreases by 43–51% when the cavity is inclined (θ = 90 deg). The conduction loss is found to be accounted for up to 32–34% of the total heat loss, whereas the cavity radiative loss is estimated to be 13%, 16%, and 20% of the total heat loss, respectively, for cavity wall temperature 225 °C, 325 °C, and 425 °C. The investigation of convective losses showed significant change with cavity tilt angles. It is 46–54% of the total heat loss when the cavity aperture is facing sideways (θ = 0 deg), whereas its value reduces up to 4% of the total heat loss when the cavity aperture is facing downward (θ = 90 deg). A Nusselt number correlation has been developed for predicting the convective heat loss from a open cavity. The Nusselt number correlation correlates 100% of data within ± 20% deviation.

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References

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Figures

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Fig. 1

Photograph of the experimental setup

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Fig. 2

Schematic of experimental setup: (a) front view and (b) side view (all dimensions in millimeters)

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Fig. 3

Cavity heating and supported connecting rods arrangement: (a) cavity receiver with different sections, (b) heating coils, and (c) support frame for mounting of cavity and thermocouples

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Fig. 5

Display parameters of acquiring data

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Fig. 6

Schematic arrangement for experimental conduction loss measurement

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Fig. 7

Sample plots of measured average wall temperature with time: (a) Tw = 225 °C, θ = 0 deg, (b) Tw = 325 °C, θ = 0 deg, and (c) Tw = 425 °C, θ = 0 deg

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Fig. 8

Measured wall temperature at different cavity inclinations: (a) θ = 0 deg, (b) θ = 30 deg, (c) θ = 60 deg, and (d) θ = 90 deg (temperatures at 0.255 m shown are back wall temperatures)

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Fig. 9

Variation of measured total heat loss with inclination for different operating temperatures

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Fig. 10

Variation of measured conduction loss with the operating temperature

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Fig. 11

Variation of measured Qconv + Qrad losses with cavity inclinations at different cavity operating temperatures: (a) Tw = 225 °C, (b) Tw = 325 °C, and (c) Tw = 425 °C

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Fig. 12

Cavity subsurfaces for approach I

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Fig. 13

Co-axial parallel surfaces

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Fig. 14

Cavity subsurfaces for approach II

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Fig. 15

Variation of the Nusselt number with cavity inclination and wall temperature

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Fig. 16

Parity plot for correlation (Eq. (18))

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