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    Investigation of the effect of the water phase in the evaporator inlet on economic performance for an Organic Rankine Cycle (ORC) based on industrial data
    (Pergamon-Elsevier Science Ltd, 2016) Ozdil, N. Filiz Tumen; Segmen, M. Ridvan
    In this paper, exergoeconomic analysis of an Organic Rankine Cycle (ORC) is presented for a local power plant, located in the southern part of Turkey. Specific Exergy Costing Method (SPECOM) is applied using balance and auxiliary equations for the exergoeconomic analysis. The capital investment cost, operating and maintenance costs, and total investment cost of ORC steam plant are calculated as 7.43 $/h, 6.69 $/h and 14.12 $/h, respectively. The unit exergy cost and exergy cost of the electricity produced by the turbine are found as 11.05 $/GJ and 14.96 $/h, respectively. In order to show the effect of the water phase in the evaporator inlet on economic performance of the system, exergoeconomic factor of the system is calculated for four different water phases. When the evaporator inlet phase is in saturated liquid form, better exergoeconomic performance is observed for the system. The highest exergoeconomic factor is observed in the pump because of the lowest exergy destruction rate and low total investment cost, while the lowest exergoeconomic factor is observed in the evaporator due to the highest exergy destruction rate in the evaporator. Moreover, payback period assessment is calculated as 3.27 years for the ORC power plant. (C) 2016 Elsevier Ltd. All rights reserved.
  • [ X ]
    Öğe
    Thermodynamic analysis of an Organic Rankine Cycle (ORC) based on industrial data
    (Pergamon-Elsevier Science Ltd, 2015) Ozdil, N. Filiz Tumen; Segmen, M. Ridvan; Tantekin, Atakan
    In this study, thermodynamic analysis of an Organic Rankine Cycle (ORC) is presented in a local power plant that is located southern of Turkey. The system that is analyzed includes an evaporator, a turbine, a condenser, a pump and a generator as components. System components are analyzed separately using actual plant data and performance cycle. The relationship between pinch point and exergy efficiency is observed. As the pinch point temperature decreases, the exergy efficiency increases due to low exergy destruction rate. The energy and exergy efficiencies of the ORC are calculated as 9.96% and 47.22%, respectively for saturated liquid form which is the real condition. In order to show the effect of the water phase of the evaporator inlet, exergy destruction and exergy efficiencies of components and overall system are calculated for different water phases. The exergy efficiency of the ORC is calculated as 41.04% for water mixture form which has quality 0.3. On the other hand, it is found as 40.29% for water mixture form which has quality 0.7. Lastly, it is calculated as 39.95% for saturated vapor form. Moreover, exergy destruction rates of the system are 520.01 kW for saturated liquid form, 598.39 kW for water mixture form which has quality 0.3, 609.5 kW for water mixture form which has quality 0.7 and 614.63 kW for saturated vapor form. The analyses show that evaporator has important effect on the system efficiency in terms of exergy rate. The evaporator is investigated particularly in order to improve the performance of the overall system. (C) 2015 Elsevier Ltd. All rights reserved.