• Infrared and Laser Engineering
  • Vol. 52, Issue 9, 20230259 (2023)
Chenglong Wang, Bolong Yan, Mao Xu, and Jun Ma
Author Affiliations
  • National Engineering Research Center for Technology and Equipment of Environmental Deposition, Lanzhou Jiaotong University, Lanzhou 730070, China
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    DOI: 10.3788/IRLA20230259 Cite this Article
    Chenglong Wang, Bolong Yan, Mao Xu, Jun Ma. Optical performance of linear Fresnel condenser under different aiming strategies[J]. Infrared and Laser Engineering, 2023, 52(9): 20230259 Copy Citation Text show less
    Structural diagram of linear Fresnel condenser
    Fig. 1. Structural diagram of linear Fresnel condenser
    Schematic diagram of mirror transformation
    Fig. 2. Schematic diagram of mirror transformation
    Relationship between the focal length of the mirror and the width of the spot
    Fig. 3. Relationship between the focal length of the mirror and the width of the spot
    Schematic diagram of two aiming strategies
    Fig. 4. Schematic diagram of two aiming strategies
    Schematic diagram of aiming point position and spot width
    Fig. 5. Schematic diagram of aiming point position and spot width
    Linear Fresnel concentrating system built with Tonatiuh
    Fig. 6. Linear Fresnel concentrating system built with Tonatiuh
    Surface energy flow distribution diagram of collector tubes with five aiming strategies
    Fig. 7. Surface energy flow distribution diagram of collector tubes with five aiming strategies
    Comparison chart of optical efficiency and energy flow standard deviation for five aiming strategies
    Fig. 8. Comparison chart of optical efficiency and energy flow standard deviation for five aiming strategies
    Comparative diagram of local concentration ratio of five aiming strategies
    Fig. 9. Comparative diagram of local concentration ratio of five aiming strategies
    Linear Fresnel heat collection experimental system
    Fig. 10. Linear Fresnel heat collection experimental system
    ParameterValue
    Width of the mirror, Wm/m 0.8
    Length of the mirror, Lm/m4
    Number of mirrors, nm16
    Distance between adjacent mirrors, Sn/m0.332
    Height of receiver, H/m 9.056
    Diameter of the tube/mm90
    Half acceptance angle of CPC, θc/(o) 45
    Aperture width of CPC/mm400
    Table 1. Linear Fresnel system parameter
    Aiming strategy xaim/m
    M1M2M3M4M5M6M7M8
    10.00
    20.035
    30.07
    4−0.035−0.025−0.015−0.0050.0050.0150.0250.035
    5−0.07−0.05−0.03−0.010.010.030.050.07
    Table 2. Five aiming strategy
    t/min T/℃
    Constant duty cycle modeVariable duty cycle mode
    Strategy 1Strategy 4Strategy 1Strategy 4
    Note: “-” signifies that the temperature is not recorded as the evacuated tube reaches its bending limit and stops heating. “=” signifies that the evacuated tube did not reach its bending limit, but the temperature exceeded the preheating set value. As a result, the temperature is no longer recorded. The temperature represents an average of multiple evacuated tubes with an accuracy of ±1 °C. Recording began on April 15, 2023, at 10:00 A.M., with a 10-minute interval. DNI: 700-800 W/m2.
    015151515
    1070658378
    20123115148137
    30177165212197
    40230215276257
    50284265340316
    60-315-=
    70-=-=
    80-=-=
    Table 3. Collector tube temperature and preheating real-time temperature
    Chenglong Wang, Bolong Yan, Mao Xu, Jun Ma. Optical performance of linear Fresnel condenser under different aiming strategies[J]. Infrared and Laser Engineering, 2023, 52(9): 20230259
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