To determine The pressure drop in the collector. Explanation Given: Size of the solar collector 1 m × 5 m . Temperature of the air is 45 ° C . Air flow rate is 0.15 m 3 / s . Calculation: Refer Table A-22 “Properties of air at 1 atm pressure” from Appendix 1 and obtain the following properties of air. Density , ρ = 1.109 kg / m 3 Kinematic viscosity, υ =1 .750 × 10 − 5 m 2 / s Calculate the mass flow rate. m ˙ = ρ V ˙ = ( 1.109 kg / m 3 ) ( 0.15 m 3 / s ) = 0.1664 kg / s Calculate the hydraulic diameter. D h = 4 A c p = 4 ( 1 m × 0 .03m ) 2 ( 1 + 0.03 ) m = 0.05825 m Calculate the velocity of air. V = V ˙ A c = 0.15 m 3 / s 1 m × 0 .03m = 5 m / s Calculate the Reynolds number

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Chapter 14, Problem 31P

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The pressure drop in the collector.

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Fundamentals of Thermal-Fluid Sciences

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