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Research Papers

Numerical Investigation of the Tube Layout Effects on the Heat Losses of Solar Cavity Receiver

[+] Author and Article Information
Jiabin Fang

School of Chemical
Engineering and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: jiabinfang@xjtu.edu.cn

Nan Tu

College of Electrics and Information,
Xi'an Polytechnic University,
Xi'an 710048, China
e-mail: tu.nan@foxmail.com

Jinjia Wei

School of Chemical
Engineering and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: jjwei@xjtu.edu.cn

Tao Fang

School of Chemical
Engineering and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: taofang@xjtu.edu.cn

Xuancheng Du

School of Chemical
Engineering and Technology,
Xi'an Jiaotong University,
Xi'an 710049, China
e-mail: 379912909@qq.com

1Corresponding author.

Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF THERMAL SCIENCE AND ENGINEERING APPLICATIONS. Manuscript received December 5, 2016; final manuscript received February 15, 2017; published online July 19, 2017. Assoc. Editor: Jingchao Zhang.

J. Thermal Sci. Eng. Appl 10(1), 011008 (Jul 19, 2017) (10 pages) Paper No: TSEA-16-1359; doi: 10.1115/1.4036792 History: Received December 05, 2016; Revised February 15, 2017

The effects of tube layout on the heat losses of solar cavity receiver were numerically investigated. Two typical tube layouts were analyzed. For the first tube layout, only the active surfaces of cavity were covered with tubes. For the second tube layout, both the active cavity walls and the passive cavity walls were covered with tubes. Besides, the effects of water–steam circulation mode on the heat losses were further studied for the second tube layout. The absorber tubes on passive surfaces were considered as the boiling section for one water–steam circulation mode and as the preheating section for the other one, respectively. The thermal performance of the cavity receiver with each tube layout was evaluated according to the previous calculation model. The results show that the passive surfaces appear to have much lower heat flux than the active ones. However, the temperature of those surfaces can reach a quite high value of about 520 °C in the first tube layout, which causes a large amount of radiative and convective heat losses. By contrast, the temperature of passive surfaces decreases by about 200–300 °C in the second tube layout, which leads to a 38.2–70.3% drop in convective heat loss and a 67.7–87.7% drop in radiative heat loss of the passive surfaces. The thermal efficiency of the receiver can be raised from 82.9% to 87.7% in the present work.

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References

Figures

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Fig. 1

Schematic diagram of the heat transfer issues and the corresponding solutions of a cavity system

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Fig. 2

Relationships between the relative error of convective heat loss and the number of elements

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Fig. 3

Calculation procedure for estimating the thermal performance of receiver

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Fig. 4

Relationship between the absorbed and incident power

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Fig. 5

Cavity geometry and tube layouts: (a) cavity geometry, (b) first tube layout, and (c) second tube layout

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Fig. 6

Irradiation conditions of concentrated solar energy: (a) solar flux on the aperture and (b) irradiation angle

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Fig. 7

Heat flux and temperature of receiver for the first tube layout: (a) heat flux distribution and (b) temperature distribution

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Fig. 8

Two different water–steam circulation modes for the second tube layout: (a) first circulation mode and (b) second circulation mode

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Fig. 9

Temperature of receiver for the second tube layout: (a) first circulation mode and (b) second circulation mode

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Fig. 10

Velocity field of air surrounding the cavity: (a) first tube layout, (b) second tube layout and first circulation mode, and (c) second tube layout and second circulation mode

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Fig. 11

Temperature field of air surrounding the cavity: (a) first tube layout, (b) second tube layout and first circulation mode, and (c) second tube layout and second circulation mode

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Fig. 12

Radiative and convective heat losses of inner surfaces: (a) first tube layout, (b) second tube layout and first circulation mode, and (c) second tube layout and second circulation mode

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Fig. 13

Heat losses of the cavity receiver: (a) first tube layout, (b) second tube layout and first circulation mode, and (c) second tube layout and second circulation mode

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