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Research Papers

Comparison of Two-Phase Flow Correlations for Thermo-Hydraulic Modeling of Direct Steam Generation in a Solar Parabolic Trough Collector System

[+] Author and Article Information
Bohra Nitin Kumar

Heat Transfer and Thermal Power Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: jain.ni3@gmail.com

K. S. Reddy

Heat Transfer and Thermal Power Laboratory,
Department of Mechanical Engineering,
Indian Institute of Technology Madras,
Chennai 600036, India
e-mail: ksreddy@iitm.ac.in

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received March 14, 2017; final manuscript received September 13, 2017; published online April 10, 2018. Assoc. Editor: Wei Li.

J. Thermal Sci. Eng. Appl 10(4), 041005 (Apr 10, 2018) (10 pages) Paper No: TSEA-17-1076; doi: 10.1115/1.4038988 History: Received March 14, 2017; Revised September 13, 2017

Direct steam generation (DSG) in parabolic trough collector (PTC) is an efficient and feasible option for solar thermal power generation as well as for industrial process heat supply. The two-phase flow inside the absorber tube complicates the thermo-hydraulic modeling of the DSG process. In the present work, a thermo-hydraulic model is developed for the DSG process in the receiver of a solar PTC. The two-phase flow in the evaporating section is analyzed using two empirical correlations of heat transfer and pressure drop, and a flow map integrated heat transfer and pressure drop model. The results of the thermo-hydraulic simulation using different two-phase heat transfer and pressure drop correlations were compared with experimental data from the direct solar steam (DISS) test facility at Plataforma Solar de Almeria (PSA), Spain. The test facility has collectors with aperture width of 5.76 m, focal length of 1.71 m, and absorber tube with inner and outer diameters of 50 mm and 70 mm, respectively. The simulation results using the aforementioned two-phase models were found to be satisfactory and consistent within the experimental uncertainty. The flow map based heat transfer model predicted the mean fluid temperature with root-mean-square error (RMSE) of 0.45% and 1.40%, for the cases considered in the present study. Whereas the flow pattern map based pressure drop model predicts the variation of pressure along the length of the collector with RMSE of 0.5% and 0.14%. Moreover, the flow pattern map based model predicts the different flow regimes paving a better understanding of the two-phase flow and helps in identifying the critical sections along the collector length.

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References

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Figures

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Fig. 2

Energy balance in a PTC

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Fig. 1

Solar collectors' loop in once-through mode at DISS test facility [3]

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Fig. 4

Flowchart for the thermo-hydraulic modeling of DSG process

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Fig. 5

Variation of HTC, heat loss per unit length of absorber, and absorber outer wall temperature for (a) case-A and (b) case-B

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Fig. 6

Contributions of convective and nucleate boiling heat transfer coefficient for (a) case-A and (b) case-B

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Fig. 3

Cross section of tube with stratified two-phase flow [14]

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Fig. 7

Flow pattern map developed for (a) case A and (b) caseB

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