, Davis Operations And Supply Chain Management Assignment Help – A solar flux

, Davis Operations And Supply Chain Management Assignment Help – A solar flux

Question – A solar flux of 700 W/m2 is incident on a flat-plate solar collector used to heat water. The area of the
collector is 3 m2, and 90% of the solar radiation passes through the cover glass and is absorbed by
the absorber plate. The remaining 10% is reflected away from the collector. W ater flows through the
tube passages on the back side of the absorber plate and is heated from an inlet temperature Ti; to
an outlet temperature To. The cover glass, operating at a temperature of 30°c’ has an emissivity of
0.94 and experiences radiation exchange with the sky at – 10°C. The convection coefficient between
the cover glass and the ambient air at 25°C is l0 W/m2 · K.

(a) Perform an overall energy balance on the collector t …Read Moreo obtain an expression for the rate at which
useful heat is collected per unit area of the collector, q”u. Determine the value of q”u.
(b) Calculate the temperature rise of the water, To – Ti, if the flow rate is 0.01 kg/s. Assume the
specific heat of the water to be 4179 J/kg · K.
(c) The collector efficiency ? is defined as the ratio of the useful heat collected to the rate at which
solar energy is incident on the collector. What is the value of ?? …Read Less

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