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International Journal of Advances in Engineering & Technology, Jan. 2013. ©IJAET ISSN: 2231-1963 operation [6].In this paper, combination of the exergy analysis and the lumped capacity was used to simulate thermal characteristics of a long TPCT system. The aims of this paper are as follows: 1. The exergy analysis of the two-phase closed thermosyphon system was performed for some refrigerants as the working fluids in an ORC. 2. Predict extracted heat as a function of the length of evaporator heat pipe based on different working fluids. 3.Comparing different working fluids at different operating condition such as: First and second thermodynamic law, Exergy distruction ratio,.. II. ANALYSIS OF A (TPCTS) AND (ORC) As shown in Fig. 2, the two-phase closed thermosyphon is a closed container filled with a small amount of working fluid. According to this figure, heat is added to the evaporator wall, which causes the liquid in the pool to evaporate. The generated vapor then moves upwards to the condenser. The heat transported is then rejected into the heat sink by a condensation process. The condensate forms a liquid film which flows downwards due to gravity. Here, the heat flux rate (Qe ) and the convective cooling conditions (h∞ and T∞ ) are given. Fig 1. Schematic drawing of the TPCT operation 2.1. Organic Rankine Cycle (ORC) with a two-phase closed thermosyphon The cycle considered is a simple cycle, which consists of a pump, heat exchanger, turbine and condenser (Fig. 1). The working fluid is saturated liquid at the exit of the condenser; it is then pumped to the heat exchanger where it gains heat from the heat source. Hot pressurized working fluid expands in the turbine thereby doing useful work. Pump and turbine efficiency is 80% and generator efficiency is 90%. The turbine efficiency is assumed to be the same for all working fluids and all cases considered. The selection of the working fluid has great implications for the performance of a binary plant. While there are many choices available for working fluids, there are also many constraints on that selection that relate to the thermodynamic properties of the fluids as well as considerations of health, safety, and environmental impact [7]. This work investigates the potential of different working fluids for power production at different operating pressure for subcritical cycle. Energy and exergy balance of the cycle is carried out. The investment cost of low-temperature energy recovery system (power cycle) is highly dependent on the cost of the components, i.e. heat exchangers, turbine, pumps 53 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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