What is the optimal size for a solar absorber
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What is the optimal size for a solar absorber? PowerPoint PPT Presentation


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What is the optimal size for a solar absorber?. Stephen Evans Samuel Seager Me 340 Dr. Vladimir Solovjov. The component of direct radiation. Xcosø = W m /2 X = W m /(2cosø) Qdir = AE a q” = W m L/2cosø(E a q dir ”). The component of diffused radiation. tan(θ/2) = (W a /2)/d

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What is the optimal size for a solar absorber?

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What is the optimal size for a solar absorber

What is the optimal size for a solar absorber?

Stephen Evans

Samuel Seager

Me 340 Dr. Vladimir Solovjov


The component of direct radiation

The component of direct radiation

  • Xcosø = Wm/2

  • X = Wm/(2cosø)

  • Qdir = AEa q” = WmL/2cosø(Eaqdir”)


The component of diffused radiation

The component of diffused radiation

  • tan(θ/2) = (Wa/2)/d

  • θ/2 = arctan(Wa/2d)

  • θ = 2arctan(Wa/2d)

  • Percentage of diffused radiation is: η

  • η = angle of projected/total projected = θ/Π = (2/Π) arctan (Wa/2d)

  • Qdiff = Aηqdiff = (WmL2/Π)arctan (Wa/2d)


Net energy from radiation

Net energy from radiation

  • Q = [(WmL/2cosθ)(Eaqdir”) + (2WmL/Π) arctan (Wa/2d)]n - Ea r(Ta4 – T∞4)WaL

  • Plot with varying Wm to find qmax

  • Conclusion: The ideal width for the solar collector absorber should be in the range of 40 to 60 inches depending on its surface temperature.


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