Written Assignment 8 Solutions.pdf

C in order to calculate the total entropy generation

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(c) In order to calculate the total entropy generation S gen , the second law relation for transient process can be used: 𝑄 𝑐𝑣 ? + ? 𝑔𝑒𝑛 = ∑ 𝑚 𝑒 𝑠 𝑒 𝑒𝑥𝑖?? ∑ 𝑚 𝑖 𝑠 𝑖 + 𝑖𝑛𝑙𝑒?? (𝑚 2 𝑢 2 − 𝑚 1 𝑢 1 ) 𝑐𝑣 There is no water leaving the container, equation can be simplified to: T Q s m s m s m S cv cv i i gen ) ( 1 1 2 2 The only term that needs to be found is s i and s i = s sup . At P i = 400 kPa, use linear interpolation to find s i . The relevant properties can be found on table A-6. h (kJ/kg) s (kJ/kg·K) 3067.1 7.5677 3192.046984 s i 3273.9 7.9003
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