Which of the following is used in HID dimming circ
a. SL
b. SLD
c. SLIP
d. SLOD
d. SLOD
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Solar radiation is incident on a 5-m2 solar absorber plate surface at a rate of 800?W/m2. Ninety-three percent of the solar radiation is absorbed by the absorber plate, while the remaining 7 percent is reflected away. The solar absorber plate has a surface temperature of 40°C with an emissivity of 0.9 that experiences radiation exchange with the surrounding temperature of ??5°C. In addition, convective heat transfer occurs between the absorber plate surface and the ambient air of 20°C with a convection heat transfer coefficient of 7?W/m2•K. Determine the efficiency of the solar absorber, which is defined as the ratio of the usable heat collected by the absorber to the incident solar radiation on the absorber.
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