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Research Papers

Behavior of a Solar Collector Loop During Stagnation

[+] Author and Article Information
Ziqian Chen

Institute of Physics Science
and Engineering Technology,
Guangxi University,
100 Da Xue Road,
Nanning, Guangxi 530004, China
e-mail: czq8676@hotmail.com

Janne Dragsted

Department of Civil Engineering,
Technical University of Denmark,
Brovej, Building 118,
DK 2800 Kgs. Lyngby, Denmark
e-mail: jaa@byg.dtu.dk

Simon Furbo

Department of Civil Engineering,
Technical University of Denmark,
Brovej, Building 118,
DK 2800 Kgs. Lyngby, Denmark
e-mail: sf@byg.dtu.dk

Bengt Perers

Department of Civil Engineering,
Technical University of Denmark,
Brovej, Building 118,
DK 2800 Kgs. Lyngby, Denmark
e-mail: beper@byg.dtu.dk

Jianhua Fan

Department of Civil Engineering,
Technical University of Denmark,
Brovej, Building 118,
DK 2800 Kgs. Lyngby, Denmark
e-mail: jif@byg.dtu.dk

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received August 6, 2012; final manuscript received June 11, 2014; published online March 12, 2015. Editor: Gilles Flamant.

J. Sol. Energy Eng 137(3), 031017 (Jun 01, 2015) (10 pages) Paper No: SOL-12-1192; doi: 10.1115/1.4027933 History: Received August 06, 2012; Revised June 11, 2014; Online March 12, 2015

A mathematical model simulating the emptying behavior of a pressurized solar collector loop with solar collectors with a good emptying behavior is developed and validated with measured data. The calculated results are in good agreement with the measured results. The developed simulation model is therefore suitable to determine the behavior of a solar collector loop during stagnation. A volume ratio R, which is the ratio of the volume of the vapor in the upper pipes of the solar collector loop during stagnation and the fluid content of solar collectors, is introduced to determine the mass of the collector fluid pushed into the expansion vessel during stagnation, Min. A correlation function for the mass Min and the volume ratio R for solar collector loops is obtained. The function can be used to determine a suitable size of expansion vessels for solar collector loops.

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References

Figures

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Fig. 1

Experimental setup

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Fig. 8

Measured and calculated pressure on the upper part of the solar collector loop during stagnation, Sept. 1, 2009

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Fig. 10

Correlation of the mass of solar collector fluid pushed into the expansion vessel during stagnation and the expansion vessel empty volume at different system filling pressures. The prepressure of the expansion vessel is 1.0 bar.

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Fig. 5

Total solar irradiance on solar collectors, Sept. 1, 2009

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Fig. 6

Measured and calculated mass of solar collector fluid pushed into the expansion vessel during stagnation, Sept. 1, 2009

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Fig. 7

Measured and calculated pressure at the bottom part of the solar collector loop during stagnation, Sept. 1, 2009

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Fig. 9

Correlation of the mass of solar collector fluid pushed into the expansion vessel during stagnation and the expansion vessel empty volume at different prepressures. The system filling pressure of the solar collector loop is 2.55 bars.

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Fig. 15

Correlation of the ratio Vcs/Vc and the volume ratio R in case 1 and in case 2.

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Fig. 11

Correlation of the volume ratio R and the mass of solar collector fluid pushed into the expansion vessel during stagnation and the solar irradiance.

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Fig. 14

Correlation of the mass Min and the volume ratio R in case 1 and in case 2.

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Fig. 12

The mass of solar collector fluid pushed into the expansion vessel during stagnation as function of the volume ratio R with different insulation thicknesses of the upper pipes.

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Fig. 13

The mass of solar collector fluid pushed into the expansion vessel during stagnation as function of the volume ratio R with different numbers of solar collectors.

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