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The exergy destruction can be also calculated based on entropy generation in each component as: ̇̇ (5) where ̇ denotes the entropy generation rate in the component i and it is determined from applying the entropy balance equation for a steady state operation on each component of the system as follows: ̇ ∑̇ ∑̇ ∑̇⁄ (6) The exergy destruction ratio for each component of the system is defined as the exergy destruction rate occurs in a certain component with respect to the total exergy destruction of the whole system: ̇ ⁄∑ ̇ (7) The overall system thermodynamics performance can be measured by the energy and exergy efficiencies. The energy efficiency can be calculated as follows: ̇ ̇ (8) And the exergy efficiency for is defined as the useful exergy output of the system, which is the net- work gain, over the exergy of the utilized input to the system: ̇ ̇ (9) It can also be expressed as a function of the exergy destruction rate in the system components as follows: ∑̇ ̇ (10) Furthermore, we aim to assess the sustainability dimension of the system. It is known that sustainable development requires an efficient use of the available resources besides using clean and affordable energy resources. Exergy analysis appears to be a significant tool for energy systems which may contribute in improving the sustainable development. A simple assessment is possible through the sustainability index which is defined as a function of exergy efficiency [20-22]: (11) 4. Heat Exchanger Surface Area The design of the evaporator and the condenser is discussed in this section. The regenerative heat exchanger overall heat transfer coefficient is taken relative to the ones for the evaporator and condenser. The evaporator, condenser and regenerative heat exchanger in the proposed system are shell and plate type heat exchangers [7]. This type of heat exchangers matches well with the existing case because of its high heat transfer coefficient that results in more compactness, especially with the relatively low temperatures of the heat sources in the proposed regenerative 4PDF Image | Exergoeconomic Analyses and Optimization of Geothermal ORC
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