A concentrating solar collector consists of a
Chapter 6, Problem 6.11(choose chapter or problem)
A concentrating solar collector consists of a parabolicreflector and a collector tube of diameter D, throughwhich flows a working fluid that is heated with concen-trated solar irradiation. Throughout the day, the reflec-tor is slowly repositioned to track the sun. For windconditions characterized by a steady, horizontal flownormal to the tube axis, the local heat transfer coeffi-cient on the tube surface varies, as shown in theschematic for various reflector positions.Case 1V, TCollector tubeParabolic reflectorDNud?hd/k?CRemdPr1/3(a) Estimate the value of the average heat transfercoefficient over the entire collector tube surface foreach of the three cases.(b) Assuming the tube receives the same amount ofsolar irradiation in each case, which case wouldhave the highest collector efficiency?
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