A Thermodynamic Analysis And Comparison Of An Organic Rankine Cycled (ORC) System With Six Different Wet, Dry And Isentropic Working Fluids

Year 2022, Issue: 17, 1 - 8, 31.12.2022

Özlem Boydak

Abstract

Organic rankine cycle (ORC) is environment friendly waste low heat energy recovery system, utilizing organic working fluid instead of steam utilized in classic rankine cycle. Different types of organic working fluids, which are mainly wet,dry and isentropic, can be used in ORC systems. Isentropic fluids are highly usable, also freons and their alternatives demonstrate similar system responses in ORC system. Thus, organic fluid selection is an important case in terms of not only efficiency, energy and exergy but also safety and environmental concerns. In this study, an organic rankine cycled system with different organic working fluids, which are R134a, R245fa, R152a, R11, R113 and R32 was simulated via a simulation software. After simulations, the results were analyzed and compared. According to this results, the highest system thermal efficiency value as 0,26 was gained with the R11 working fluid. Then, the system thermal efficiency with R113 is 0,21, and then it is 0,20 with R245fa, then the system thermal efficiency with R134a is 0,14, and then it is 0,13 with R152a, and lastly the lowest thermal efficiency is 0,05 with R32, respectively, under same working conditions. Moreover, the biggest generator work is supplied with R11 as 826 kW, then with R152a as 600 kW, then with R113 as 516 kW, then with R245fa as 509 kW, then with R134a as 397 kW, then with R32 the lowest generator work value as 191 kW. Accordingly, as a result, R11, and then R113 supplied the best performance values for this ORC system, respectively. Further future studies on this subject area is on spot and continuing.

Keywords

ORC, Organic working fluids, energy efficiency, energy recovery system, working fluid selection, thermodynamic analysis

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