3.8-7 Figure P3.8-7 illustrates the flat plate solar collector that was previously analyzed under steady state conditions in Problem 1.9-7. L=8cmth=1.5mmεk=75W/m2-Kρ= 8800 kg/m3c= 375 J/kg-K25W/m -K10 ChT∞==°50 CwTsq′′±Figure 3.8-7: Flat plate solar collector. The collector consists of a flat plate that is th= 1.5 mm thick with conductivity k= 75 W/m-K, density = 8800 kg/m3, and specific heat capacity c= 375 J/kg-K. The plate is insulated on its back side and under normal conditions experiences a solar flux of ,s maxq±= 900 W/m2that is all absorbed. The surface is exposed to convection and radiation to the surroundings. The emissivity of the surface is = 1. The heat transfer coefficient is h= 5 W/m2-K and the surrounding temperature is T∞= 10ºC. The temperature of the water is Tw= 50ºC. The center-to-center distance between adjacent tubes is 2 Lwhere L= 8 cm. This problem deals with the transient behavior of the collector.
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