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(23) where , and are the pitch of the flutes on the heat exchanger plate, the heat transfer length and the depth of the flutes, respectively. The Bond Number (Bo) and Grashof Number (Gr) are dimensionless numbers and are defined as (24) ( )( ) (25) 5. Economic and Exergoeconomic Analyses The system economic analysis is performed taking into account the purchased components and equipment cost, operation and maintenance (O&M) cost and the cost of the energy input. The exergoeconomic (thermoeconomic) analysis is the study of the economic principles considering the exergy analysis of the system under study. The thermoeconomic analysis is performed by applying the cost balance equation on the system components where the steams crossing the components boundaries are expressed in the form of exergy cost rates of these streams. This equation can be formulated in a general form as follows: ∑̇ ̇ ∑̇ ̇ ̇ (26) where ̇ denotes the total cost rates of the exergy streams across a specific component in the system, and its values are expressed in $/h. They are defined as follows: ̇̇ ̇̇ ̇̇ ̇̇ (27) (28) (29) (30) Here, c denotes the average cost per exergy unit and is expressed in $/GJ. The exergy rate values in these equations are determined based on the exergy analysis of the system. The total cost rate associated with the products of the proposed system is expressed in the following equation as a function of the total fuel cost rate, ̇ and the annual investment cost rate of the system components, ̇ , as follows: ̇̇̇ (31) The annual investment cost rate of any component, ̇, is calculated for the proposed system. It is the summation of the annual capital investment cost rate and the annual O&M cost rate. The total capital investment (TCI) is considered in two parts; direct capital cost (DCC) and indirect capital costs (ICC). The direct capital cost for this study is the purchase equipment cost (PEC). The 7PDF Image | Exergoeconomic Analyses and Optimization of Geothermal ORC
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