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Question

# Indicate whether the following statements are true or false. Explain. A closed system exergy balance consists of three major contributions: exergy change, exergy transfer, and exergy destruction.

Solution

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Exergy balance of a closed system is calculated as:

$E_2-E_1=\int_{1}^{2} \left (1-\frac{T_0}{T_b} \right ) \delta_Q-\left\vert W-p_0(v_2-v_1) \right \vert - T_0\sigma$

Where term

$E_2-E_1$

defines exergy $\textbf{change}$

$\int_{1}^{2} \left (1-\frac{T_0}{T_b} \right ) \delta_Q-\left\vert W-p_0(v_2-v_1) \right \vert$

defines exergy $\textbf{transfer}$ and

$T_0\sigma$

defines exergy $\textbf{destruction}$.

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