Modelling and performance evaluation of an organic rankine cycle (ORC) with R245FA as working fluid

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2012-5

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Bamgbopa, Musbaudeen Oladiran

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This thesis presents numerical modelling and analysis of a solar Organic Rankine Cycle (ORC) for electricity generation. A regression based approach is used for the working fluid property calculations. Models of the unit’s sub-components (pump, evaporator, expander and condenser) are also established. Steady and transient models are developed and analyzed because the unit is considered to work with stable (i.e. solar + boiler) or variable (i.e. solar only) heat input. The unit’s heat exchangers (evaporator and condenser) have been identified as critical for the applicable method of analysis (steady or transient). The considered heat resource into the ORC is in the form of solar heated water, which varies between 80-95 0C at a range of mass flow rates between 2-12 kg/s. Simulation results of steady state operation using the developed model shows a maximum power output of around 40 kW. In the defined operation range; refrigerant mass flow rate, hot water mass flow rate and hot water temperature in the system are identified as critical parameters to optimize the power production and the cycle efficiency. The potential benefit of controlling these critical parameters is demonstrated for reliable ORC operation and optimum power production. It is also seen that simulation of the unit’s dynamics using the transient model is imperative when variable heat input is involved, due to the fact that maximum energy recovery is the aim with any given level of heat input.

Subject Keywords

Organic Rankine cycle, R245fa, Transient modelling, Phase change heat transfer, Organik Rankine çevrimi, R245fa, Geçici ısı aktarımı yöntemleri, Faz değişimli ısı aktarımı

URI

https://hdl.handle.net/11511/69680

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Northern Cyprus Campus, Thesis

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Citation Formats

M. O. Bamgbopa, “Modelling and performance evaluation of an organic rankine cycle (ORC) with R245FA as working fluid,” M.S. - Master of Science, Middle East Technical University, 2012.