# HW8s - Spring 2006 Thermodynamics Homework#8 Solution 1 Ten...

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Spring 2006 1 ME 201 Thermodynamics Homework #8 Solution 1. Ten grams of water at 15 ° C and 100 kPa completely fills a balloon. The balloon is then heated on the stove top at constant pressure until the temperature reaches 125 ° C. Determine the boundary work in kJ involved in this process. What is the boundary power, if the process takes 700 seconds? Solution: Substance Type: Compressible(water) Process: Constant Pressure State 1 State 2 T 1 = 15 ° C T 2 = 125 ° C P 1 = 100 kPa P 2 = P 1 = 100 kPa v 1 = 0.001001 m 3 /kg v 2 = 1.8163 m 3 /kg m 1 = 0.01 kg m 1 = 0.01 kg phase: sub.liq. phase: sup.vap. Italicized values are from steam tables. Bold values are calculated. For a constant pressure process our boundary work is given by w = P(v - v ) bnd 2 1 and then W bnd = m w bnd and W = W t bnd bnd Δ So to perform this calculation we will need to determine the two specific volumes. At state 1, we know the pressure and temperature so that the state is fixed. Going to

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HW8s - Spring 2006 Thermodynamics Homework#8 Solution 1 Ten...

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