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

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?

Stephen Evans

Samuel Seager

• Xcosø = Wm/2

• X = Wm/(2cosø)

• Qdir = AEa q” = WmL/2cosø(Eaqdir”)

• 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)

• 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.