Determination of Solar Energy Absorption and Thermal Radiative Properties of some Agricultural Products

1987 ◽  
Vol 30 (1) ◽  
pp. 0259-0265 ◽  
Author(s):  
E. A. Arinze ◽  
G. J. Schoenau ◽  
F. W. Bigsby
Keyword(s):  
Solar Energy ◽  
Energy Absorption ◽  
Agricultural Products ◽  
Radiative Properties ◽  
Thermal Radiative Properties

Determination of thermal radiative properties of packed-bed media containing a mixture of polydispersed particles

2009 ◽  
Vol 48 (8) ◽  
pp. 1510-1516 ◽  
Author(s):  
Klaus Jäger ◽  
Wojciech Lipiński ◽  
Helmut G. Katzgraber ◽  
Aldo Steinfeld
Keyword(s):  
Packed Bed ◽  
Radiative Properties ◽  
Thermal Radiative Properties

Experimental and Numerical Determination of Thermal Radiative Properties of ZnO Particulate Media

2009 ◽  
Vol 132 (1) ◽  
Author(s):  
P. Coray ◽  
W. Lipiński ◽  
A. Steinfeld
Keyword(s):  
Radiative Properties ◽  
Continuous Beam ◽  
Scattering Medium ◽  
Measured Intensity ◽  
Particulate Media ◽  
Varying Thickness ◽  
Thermal Radiative Properties ◽  
Exponential Trend ◽  
Radiative Characteristics

The radiative characteristics of dependently scattering packed-beds of ZnO particles, applied in the design of high-temperature solar thermochemical reactors, were investigated experimentally. ZnO samples of varying thickness were exposed to a continuous beam of near monochromatic thermal radiation in the 0.5–1 μm wavelength range. The overall transmitted fraction measured as a function of sample thickness s obeys an exponential trend exp(−As), with the fit parameter A ranging from 4000±100 m−1 at 555 nm to 2100±100 m−1 at 1 μm. In the forward directions, the measured intensity distribution is approximately isotropic, whereas in the backward directions it is well approximated by a Henyey–Greenstein equation with asymmetry factors g≈−0.4 at 555 nm and g≈−0.1 at 1 μm. A Monte Carlo ray-tracing model of the experimental setup is employed to extract the extinction coefficient and the scattering albedo for the case of a nongray absorbing-scattering medium.

Experimental and Numerical Determination of Thermal Radiative Properties of ZnO Particulate Media

2008 ◽  
Author(s):  
Patrick Coray ◽  
Wojciech Lipin´ski ◽  
Aldo Steinfeld
Keyword(s):  
Radiative Properties ◽  
Asymmetry Factor ◽  
Scattering Medium ◽  
Measured Intensity ◽  
Particulate Media ◽  
Thermal Radiative Properties ◽  
Exponential Trend ◽  
Set Up ◽  
Radiative Characteristics

The radiative characteristics of packed beds of ZnO particles, applied in the design of high-temperature solar thermochemical reactors, were investigated experimentally. ZnO samples of varying thickness were exposed to a continuous beam of near monochromatic thermal radiation in the 0.5–1 μm wavelength range. The overall transmitted fraction measured as a function of sample thickness s obeys an exponential trend exp(–As), with the fit parameter A ranging from (4000 ± 100) m−1 at 555 nm to (2100 ± 100) m−1 at 1 μm. In the forward directions, the measured intensity distribution is approximately isotropic, whereas in the backward directions it is well approximated by a Henyey–Greenstein equation with asymmetry factor g ≈ − 0.4 at 555 nm and g ≈ − 0.1 at 1 μm. A Monte Carlo ray-tracing model of the experimental set-up is employed to extract the extinction coefficient and the scattering albedo for the case of non-grey absorbing-scattering medium.

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