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geothermal organic Rankine cycle [7, 23]. The specifications and material properties of the shell and plate heat exchangers used in this analysis are given in Table 2. Table 2 Heat Exchanger Specifications Element Heat transfer surface length, mm 1465 Width of the heat transfer plate, mm 605 Clearance at organic fluid side, mm 5 Clearance at water side, mm 5 Pitch of the flute, mm 1 Depth of the flute, mm 1 Plate material Titanium Plate thickness, mm 0.9 Number of plates 200 Source [6, 23, 24]. The logarithmic mean temperature difference (LMTD) method is used in the analysis of the heat exchangers and the calculation of the heat transfer area. The heat transfer rate is described as ̇ (12) where A is the surface area of the heat exchanger and U is the overall heat transfer coefficient which is calculated as follows: (13) where is the convection heat transfer coefficient of the organic fluid, represents the convection heat transfer coefficient for the hot source in the evaporator or the cooling water in the condenser. Also, t and k are the thickness and thermal conductivity of the heat exchanger plate material. The heat transfer coefficients for hot and cold water side and the organic fluid side are determined using empirical correlations from the literature [6, 10, 25-28] based on the calculation of Nusselt Number as (14) where denotes the approximate diameter which is approximated to equal twice the clearance of the heat exchanger plate [23]. For the water side heat transfer coefficient at the system heat exchangers, the following correlation is used to calculate Nusselt Number [6]: (15) 5PDF Image | Exergoeconomic Analyses and Optimization of Geothermal ORC
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