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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Vahid Esfahanian (Professor of Mechanical Eng.)
Mohammad Kordi (Senior Research Scientist)
Kamran Mahootchi Saeed (Senior Research Scientist)

Abstract:
A comprehensive thermodynamic simulation and modelling of a biomass system for heating, electricity generation and hot water production are needed to design and evaluate a biomass system. This biomass system consists of a gas turbine cycle, an Organic Rankine Cycle (ORC) and a domestic water heater. Energy, exergy, exergoeconomic analyses and environmental impact assessments and related parametric studies of each thermodynamic unit helps designers to find ways to improve the performance of the system in a cost effective way, and parameters that affect environmental impact and sustainability. The objective of this paper is to evaluate irreversibility of a Biomass-ORC Unit and it's thermodynamic modelling. The effect of changes in main parameters on the exergetic efficiency and exergy destruction in the biomass-ORC unit has been evaluated. The exergy destruction and exergy loss of each component of this ORC unit have been estimated. Moreover, the effects of the load variations and ambient temperature have been calculated in order to obtain a good insight into this analysis. The exergy efficiencies of the Burner, ORC-turbine, pump, evaporator and the condenser have been estimated at different ambient temperatures. Additionally, the exergoeconomic and exergoenvironmental analysis have been performed for each component of the ORC unit in order to calculate the cost of exergy destruction. The biomass-ORC unit include of a burner, heat exchanger, evaporator, ORC-turbine and condenser. The design parameters of the unit chose as: ORC-turbine pressure ratio, ORC-turbine isentropic efficiency, combustion chamber inlet temperature, and turbine inlet temperature. The main program has been developed in MATLAB Software programming. In order to find the optimal system design parameters, a exergoeconomic and exergoenvironmental approach also have been followed. In this article, the effect of some thermodynamic or system parameters in a biomass-ORC unit for one region in Iran, with hot–dry climate conditions have been conducted, as a case study. REFERENCES [1] Tj. Kotas, The Exergy Method of Thermal Plant Analysis, Butterworths: London, 1985. [2] M.S. Peters and K.D. Timmerhaus, Plant design and economics for chemical engineers, 4th Edition, McGraw Hill, 1991.