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Technical Brief

Dust Effect on Thermal Performance of Flat Plate Solar Collectors

[+] Author and Article Information
Zhao Jing

School of Material Science and Engineering,
Lanzhou University of Technology,
Lanzhou 730050, China
e-mail: Zhaojing274704@126.com

Wang Zhiping

School of Material Science and Engineering,
Lanzhou University of Technology,
Lanzhou 730050, China
e-mail: solar_energy8@126.com

Wang Kezhen

Renewable Energy Laboratory,
Lanzhou University of Technology,
Lanzhou 730050, China
e-mail: 838300835@qq.com

Liu Jianbo

School of Material Science and Engineering,
Lanzhou University of Technology,
Lanzhou 730050, China
e-mail: Liujianbo01@126.com

1Corresponding author.

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 September 11, 2013; final manuscript received August 6, 2014; published online September 3, 2014. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 137(1), 014502 (Sep 03, 2014) (5 pages) Paper No: SOL-13-1251; doi: 10.1115/1.4028364 History: Received September 11, 2013; Revised August 06, 2014

The solar collectors were exposed to the ambient conditions and left without cleaning for three months in winter in Lanzhou. In this paper, the effect of dust accumulation on the instantaneous efficiency, stagnation temperature and temperature rise of flat plate solar collectors is analyzed. The efficiency of solar collectors with and without dust in steady-state condition is measured following the Chinese National Standard GB/T 4271. Beside this, the stagnation test is carried out. The results show that the optical efficiency decrease of 9.7% and the stagnation temperature decrease of 0.3 °C–7.2 °C over time in a solar collector exposed for three months without cleaning. Furthermore, daily test is conducted. The efficiency, dust shading coefficient, and temperature rise of solar collectors are calculated by using experimental data. In this experiment, the dust shading coefficient changes between 0.83 and 0.94 during the whole day, and it is lower at noon than in the morning and evening hours. The efficiency difference and the temperature rise difference between the solar collectors with and without dust also vary with the dust shading coefficient, the optical efficiency, total solar irradiance, and mass flow rate during the whole day.

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Figures

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Fig. 1

Schematic view of the experimental test rig

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Fig. 2

Efficiency curves obtained in steady-state test for both solar collectors with and without dust

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Fig. 3

Measured ambient temperature, total and diffuse solar irradiance during stagnation test period

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Fig. 4

Experimental points in Ts–G diagram for the solar collectors with and without dust

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Fig. 5

The optical efficiency FR(τα)e,n and FR(τα)e,w, and the dust shading coefficient Fd1 versus time

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Fig. 6

Measurements during daily test: diffuse and total irradiance, inlet, outlet, and ambient temperatures, and mass flow rate

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Fig. 7

Comparison between experimental average efficiency of clean solar collectors and that of solar collectors with dust accumulation

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Fig. 8

The optical efficiency FR(τα)e,n and FR(τα)e,w, and the dust shading coefficient Fd1 versus time

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Fig. 9

Comparison between the temperature rise of clean solar collectors and that of solar collectors with dust accumulation

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