Energy and Exergy (2E) Analysis of Organic Flash Cycle With Waste Heat Recovery

ABSTRACT The world is experiencing an increased power demand, hence the need for sustainable sources of power at the expense of conventional sources. This paper explores the minimization of energy waste using the organic flash cycle in combination with a regenerator to recover the waste heat with 1,1,1,3,3‐pentafluoropropane as a working fluid. A thermodynamic model was designed to optimize the operating conditions primarily in the heat recovery vapor generator (HRVG) pressure. When HRVG pressure is raised, both cycle efficiency and power will go up, but turbine inlet temperature has a greater influence on the overall performance of the system. The results indicate that boiler pressure reaches a minimum level during waste heat recovery operations compared with traditional fuel‐fired facilities, and increasing source temperatures leads to increased pressure in both cases. The optimal operation pressure for the boiler reaches 12.79 bar when the source temperature stands at 150°C. Operating under those conditions allows the system to achieve 13.20% energy efficiency and 19.53% exergy efficiency.