HW2_solution-1

# HW2_solution-1 - Homework 2 solution 1.15(a Superheated...

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Homework 2 solution 1.15. (a) Superheated table, U(kJ/kg) = 2515.5, H(KJ/Kg) = 2687.5 (b) Single interpolation, U(kJ/kg) = 3175.2 + 0.25(3167.9-3175.2) = 3173.4 , H(kJ/kg) = 3541.3 + 0.25(3531.6-3541.3) = 3538.9 (c) Double interpolation, interpolate pressure first for higher accuracy T( o C)\P(MPa) 7 7.5 8 450 U=2979.0 H=3288.3 2973.4 3280.8 2967.8 3273.3 475 U=3021.7kJ/kg H=3343.2kJ/kg 500 U=3074.3 H=3411.4 3069.9 3405.5 3065.4 3399.5 (d) Double interpolation, interpolate between saturation table and superheated table T( o C)\P(MPa) 0.6 0.7 0.8 164.95(from steam table) U=2571.81kJ/kg H=2762.75kJ/kg 180 U=2599.0kJ/kg H=2798.1kJ/kg 200(from superheated table) U=2639.3 H=2850.6 2635.15 2845.15 2631.0 2839.7 1.17 (a) superheated q=1, T=400+(3000-2966)/(3047.5-2966.0)*50=421 o C V=1.0315+21/50*(1.1092-1.01315)=1.064 m 3 /kg (b) superheated q=1 T( o C) U kJ/kg 350 2865.1 by single interpolation T=370.7 by interpolation between 350 and 400 o C 2900 400 2949.5 by single interpolation V=0.1646 at 350

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HW2_solution-1 - Homework 2 solution 1.15(a Superheated...

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