Abstract
In recent years, due to its feasibility and reliability, the organic rankine cycle has become a widespread concern and is the subject of research. In the organic rankine cycle system, the radial turbine component is a highly influential component of the high low performance resulting. This paper discusses the design of radial turbines for organic rankine cycle systems. The design stage consists of preliminary design and detail design with parametric methods on the working fluid R22 to determine the geometry and initial estimation of the performance of the radial turbine. After that, a numerical study of the fluid flow region in the radial turbine with R22 as the working fluid was performed. The analysis was performed using computational fluid dynamics of Autodesk Computational Fluid Dynamics Motion software on two models of real gas, k-epsilon and shear stress transport. From the results of this analysis, there is pressure, velocity and temperature distribution along the radial turbine blades and estimated performance under various operating conditions. Comparison between parametric and computational fluid dynamics analysis results show different performance. The difference is due to the computational fluid dynamics analysis already involving the real gas shear stress transport model.
Highlights
IntroductionThe ideal Organic Rankine Cycle (ORC) has four process stages: isentropic compression at the pump, isobaric evaporation of the boiler, isentropic expansion on the turbine, and isobaric condensation on the condenser
In recent years, due to its feasibility and reliability, the organic rankine cycle has become a widespread concern and is the subject of research
Dry fluid has a positive dT ds‒1 slope, wet fluid has a negative dT ds‒1 slope, and isentropic fluid categorized if dT ds‒1 has a zero value [12]
Summary
The ideal ORC has four process stages: isentropic compression at the pump, isobaric evaporation of the boiler, isentropic expansion on the turbine, and isobaric condensation on the condenser. The advantage of this cycle is to use a refrigerant with boiling point and condensation point lower than the water used in the regular Rankine cycle. By utilizing exhaust heat that is still hot and below 100 oC (range 65 oC to 80 oC), it is connected to an ORC generator engine evaporator, and by heat transfer process will evaporate the organic working fluid inside the evaporator and increase the pressure inside the evaporator chamber. Utilization of ORC power plant in renewable energy sources is shown in Figure 4 below:
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