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International Journal of Advances in Engineering & Technology, Jan. 2013. ©IJAET ISSN: 2231-1963 YD,i = ED,i (14) Ein where, Ein 3.3. Energetic and exergetic relations for the subsystems of the (ORC) geothermal power plant in is the exergy of geofluid. Pump hp = hs,2 - h1 h2 - h1 EP=T0.morc.(s2-s1) Turbine hp = h3 - h4 h3 - hs,4 ET=T0.morc.(s4-s3) Condenser morc .(h4 - h1)= mair (h6 - h5) IV. RESULTS AND DISCUSSION wP,orc = morc.(h2 - h1) Yd,P= EP Energy relations Exergy relations Energy relations Exergy relations Qin,orc wT,orc = morc.(h3 - h4) EC=T0.morc.(s1-s4) Yd,T= ET Qin,orc Yd,C= EC Qin,orc Exergy relations Overall energy balance in the condenser In order to validate the present combination models, some test were conducted based on the data available in Kusaba[5]. The lines in the Figure 3,4,5,6, comparison of the extracted heat as a function of saturated temperature geothermal of the present model for different working fluids with the kusab results [5]. As shown in figures [3,..,6], is a linear relationship between extracted heat and saturated temperature geothermal. In order to test with the different working fluids, we used the EES software within FORTRAN code. According to figure [7,...,10] comparison of the extracted heat as a function of the length of TPCT for different working fluids. In figures [7,..,10] the predicted performance is shown for geothermal temperature of 100 and 150 °C according to length of TPCT by using R22, R143a, water and Ammonia as working fluid. Figure. 12 shows depicts the exergy destruction ratio in each components of the geothermal ORC for different working fluids. The maximum distruction ratio is related to condenser for R22(51.53%), R134a(18.93 %), water(12.06%), R123(4.0.4%), respectively. The next-largest exergy destruction occurs in the cooling air, turbine, respectively. Figure 11. shows the resulted the net work out in an ORC for different working fluids. this figure the maximum network for water and the minimum network for R123. The Table 2. shows Summary results for the first and second law efficiency and energy analysis of the ORC. (15) 56 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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