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Exergoeconomic Analysis and Optimization of ORC

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Exergoeconomic Analysis and Optimization of ORC ( exergoeconomic-analysis-and-optimization-orc )

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5.5 System Optimization Once all applicable equations and relations are set up in EES for the expander, thermodynamic, exergoeconomic modeling and optimization could begin. The objective function for the thermodynamic analysis is system exergy efficiency given in the equation below where 􏰓􏰒􏰐 􏰯􏱝 is given as 􏰳􏱽􏰜 = 􏱻􏰐 􏱃􏱓􏱃􏱳 􏱽􏰜􏰐 􏱅􏱭 􏰓􏰒􏰐 􏰯􏱝 = 􏱟1−􏱠􏱡􏱈􏱇􏰼􏱢􏱉􏱣􏱤×􏰨􏰐􏰯􏱝􏰪 􏱡􏱘 􏱇 􏰼 􏱢 􏱉 (5.53) (5.54) Since source temperature is a function of the inlet temperature which is constant, the only factor which changes exergy input to the boiler is heat input. Heat input depends on how much energy is recovered through the regenerator which also depends on how much energy is extracted in the expander. The more energy extracted in the expander (thus being closer to the condenser temperature) the less energy available to transfer in the regenerator. The objective function for the exergoeconomic analysis is electricity cost rate. In this case, the cost rate of electricity is minimized. The equation for cost rate of electricity is given below and is modified from the cost rate balance given in Eq. 5.49. 􏰎􏰛 = 􏱽􏰜􏰐 􏱍× 􏰡􏱍􏱇􏲀􏰐􏱃􏱑􏱒􏰹􏰡􏱗×􏱽􏰜􏰐 􏱗 (5.55) 􏱻􏰐 􏱃􏱓􏱃􏱳 56

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