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$$\eta_{\mathrm{II}}=\frac{\eta_{\mathrm{th}}}{\eta_{\mathrm{th}, \mathrm{rev}}} \quad($$ heat engines $$)$$
$$\eta_{\mathrm{II}}=\frac{W_{u}}{W_{\mathrm{rev}}} \quad($$ work-producing devices $$)$$
$$\eta_{\mathrm{II}}=\frac{W_{\mathrm{rev}}}{W_{u}}$$
$$\eta_{\mathrm{II}}=\frac{\mathrm{COP}}{\mathrm{COP}_{\mathrm{rev}}}$$
$$\eta_{\mathrm{II}}=\frac{\text { Exergy recovered }}{\text { Exergy expended }}=1-\frac{\text { Exergy destroyed }}{\text { Exergy expended }}$$
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$$\eta_{\mathrm{II}}=\frac{\eta_{\mathrm{th}}}{\eta_{\mathrm{th}, \mathrm{rev}}} \quad($$ heat engines $$)$$
$$\eta_{\mathrm{II}}=\frac{W_{u}}{W_{\mathrm{rev}}} \quad($$ work-producing devices $$)$$
$$\eta_{\mathrm{II}}=\frac{W_{\mathrm{rev}}}{W_{u}}$$
$$\eta_{\mathrm{II}}=\frac{\mathrm{COP}}{\mathrm{COP}_{\mathrm{rev}}}$$
$$\eta_{\mathrm{II}}=\frac{\text { Exergy recovered }}{\text { Exergy expended }}=1-\frac{\text { Exergy destroyed }}{\text { Exergy expended }}$$
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