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International Journal of Advances in Engineering & Technology, Jan. 2013. ©IJAET ISSN: 2231-1963 and pipes. The cost of these components is directly related to size. Therefore it is important to compare the size of the components needed for different working fluids. . Fig 2. schematic of a geothermal power plant with a two-phase closed thermosyphon III. ANALYSIS 3.1. Energy and exergy analysis The solution to energy and exergy determines the mass flw rate of the working fluis, temperature and pressure at each point. Air mass flow rate of 25 kg/s is used for all cases and the other parameters used in the simulation shows in Table 1. The equations are solved using engineering equation solver, EES. EES has built-in thermodynamic and transport property function for different working fluids. Table 1: Parameters used in the simulation T0 [°C] 25 Tgeo [°C] 150 ηT [%] 80 ηP [%] 90 P3 [kpa] 1200 P4 [kpa] 140 [kg/s] 25 The following assumptions are considered during this study: a) The geothermal power plants operate in a steady-state condition. b) The pressure drops throughout the heat exchangers and pipelines are neglected. c) The turbines and pumps have isentropic efficiencies. d) The kinetic and potential energy changes are negligible. e) The geofluid is in a saturated liquid condition in the reservoir (x = 0). f) Fresh water properties have been used in the analysis instead of the thermodynamic properties of the geofluid. g) Temperature and pressure losses of the geofluid are neglected in the separation and condensation processes. h) The flashing process is accomplished at constant enthalpy. Parameters Value mair 54 Vol. 5, Issue 2, pp. 52-62PDF Image | ENERGY AND EXERGY ANALYSIS OF A GEOTHERMAL POWER STATION WITH TWO-PHASE CLOSED THERMOSYPHON SYSTEM IN AN ORGANIC RANKINE CYCLE
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