Development of micro-scale axial and radial turbines for low-temperature heat source driven organic Rankine cycle

New performance maps for selecting suitable small-scale turbine configuration for low-power organic Rankine cycle applications

“…<20 kW). The difference between the current research and the previous research (Al Jubori et al, 2016)…”

“…The reported turbine efficiency achieved as a result from the turbine optimization was 81.7%. Al Jubori et al (2016) developed a micro-scale ORC based on single-stage axial and radial-inflow turbines and five organic fluids for low-temperature heat sources. The PD and threedimensional CFD analysis were conducted for both configurations.…”

An innovative small-scale two-stage axial turbine for low-temperature organic Rankine cycle

“…Their results indicated that using working fluid R123 with the turbine mean diameter of 70 mm, the maximum total isentropic efficiency of 82% was achieved with a power output 5.6 kW. Al Jubori et al [23] developed micro-scale axial and radial-inflow turbines for a low-temperature heat source driven ORC based on five organic fluids; 1D mean-line design and 3D CFD analysis were conducted. The results showed that the axial turbine was competitive to the radial turbine at a mass flow rate of 0.5 kg/s with a maximum ORC of 10.60%, based on the radial turbine compared with 10.14% based on the axial turbine.…”

“…The effect of working fluids was concluded on the efficiency in addition to the expansion ratio and size parameter. While the 3D CFD analysis of axial turbine has been conducted in [21][22][23]; Cho et al [21] used a partial admission radial turbo-expander with a supersonic nozzle to convert available fluctuating waste thermal energy to produce a small sized power output with working fluid R245fa. The results showed that the thermal efficiency was about 4% with 6 nozzles, to produce 3.8 kW with an inlet total temperature at the inlet of the turbine of 60°C.…”

Detailed Design and Aerodynamic Performance Analysis of a Radial-Inflow Turbine

“…However, all aforementioned works did not describe an approach to achieve the second step in radial-inflow design. Although commercial software such as ANSYS-Vista RTD and RITAL do not provide any information about the rotor detailed design, stator geometry, stator profile and volute dimensional specifications, designers usually use them for the preliminary design [7,14,15]. In other similar works with preliminary design of the RI turbine, we cannot find a detailed design approach for all components of a typical RI turbine (Volute, stator and rotor) [16][17][18][19][20].In this study, we redesign the radial-inflow turbine applied in the air cycle machines at Amikabir University of Technology to achieve higher efficiency such that the coefficient of performance of ACM is improved.…”