Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG)
The organic Rankine cycle (ORC) is a thermodynamic cycle in which electrical power is generated using an organic refrigerant as a working fluid at low temperatures with low-grade enthalpy. We propose a turbine embedded in a generator (TEG), wherein the turbine rotor is embedded inside the generator...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-01-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/1/309 |
| _version_ | 1797499097818595328 |
|---|---|
| author | Jung-Bo Sim Se-Jin Yook Young Won Kim |
| author_facet | Jung-Bo Sim Se-Jin Yook Young Won Kim |
| author_sort | Jung-Bo Sim |
| collection | DOAJ |
| description | The organic Rankine cycle (ORC) is a thermodynamic cycle in which electrical power is generated using an organic refrigerant as a working fluid at low temperatures with low-grade enthalpy. We propose a turbine embedded in a generator (TEG), wherein the turbine rotor is embedded inside the generator rotor, thus simplifying turbine generator structure using only one bearing. The absence of tip clearance between the turbine rotor blade and casing wall in the TEG eliminates tip clearance loss, enhancing turbine efficiency. A single-stage axial-flow turbine was designed using mean-line analysis based on physical properties, and we conducted a parametric study of turbine performance, and predicted turbine efficiency and power using the tip clearance loss coefficient. When the tip clearance loss coefficient was applied, turbine isentropic efficiency and power were 0.89 and 20.42 kW, respectively, and ORC thermal efficiency was 4.81%. Conversely, the isentropic efficiency and power of the turbine without the tip clearance loss coefficient were 0.94 and 22.03 kW, respectively, and the thermal efficiency of the ORC was 5.08%. Therefore, applying the proposed TEG to the ORC system simplifies the turbine generator, while improving ORC thermal efficiency. A 3D turbine generator assembly with proposed TEG structure was also proposed. |
| first_indexed | 2024-03-10T03:42:35Z |
| format | Article |
| id | doaj.art-7f588456de7a4f92a759d98c0ff60b7a |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T03:42:35Z |
| publishDate | 2022-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-7f588456de7a4f92a759d98c0ff60b7a2023-11-23T11:28:45ZengMDPI AGEnergies1996-10732022-01-0115130910.3390/en15010309Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG)Jung-Bo Sim0Se-Jin Yook1Young Won Kim2Green Energy & Nano Technology R & D Group, Korea Institute of Industrial Technology, Gwangju 61012, KoreaSchool of Mechanical Engineering, Hanyang University, Seoul 04763, KoreaGreen Energy & Nano Technology R & D Group, Korea Institute of Industrial Technology, Gwangju 61012, KoreaThe organic Rankine cycle (ORC) is a thermodynamic cycle in which electrical power is generated using an organic refrigerant as a working fluid at low temperatures with low-grade enthalpy. We propose a turbine embedded in a generator (TEG), wherein the turbine rotor is embedded inside the generator rotor, thus simplifying turbine generator structure using only one bearing. The absence of tip clearance between the turbine rotor blade and casing wall in the TEG eliminates tip clearance loss, enhancing turbine efficiency. A single-stage axial-flow turbine was designed using mean-line analysis based on physical properties, and we conducted a parametric study of turbine performance, and predicted turbine efficiency and power using the tip clearance loss coefficient. When the tip clearance loss coefficient was applied, turbine isentropic efficiency and power were 0.89 and 20.42 kW, respectively, and ORC thermal efficiency was 4.81%. Conversely, the isentropic efficiency and power of the turbine without the tip clearance loss coefficient were 0.94 and 22.03 kW, respectively, and the thermal efficiency of the ORC was 5.08%. Therefore, applying the proposed TEG to the ORC system simplifies the turbine generator, while improving ORC thermal efficiency. A 3D turbine generator assembly with proposed TEG structure was also proposed.https://www.mdpi.com/1996-1073/15/1/309organic Rankine cycle (ORC)R245faaxial-flow turbinemean-line designgenerator |
| spellingShingle | Jung-Bo Sim Se-Jin Yook Young Won Kim Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG) Energies organic Rankine cycle (ORC) R245fa axial-flow turbine mean-line design generator |
| title | Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG) |
| title_full | Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG) |
| title_fullStr | Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG) |
| title_full_unstemmed | Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG) |
| title_short | Performance Analysis of Organic Rankine Cycle with the Turbine Embedded in a Generator (TEG) |
| title_sort | performance analysis of organic rankine cycle with the turbine embedded in a generator teg |
| topic | organic Rankine cycle (ORC) R245fa axial-flow turbine mean-line design generator |
| url | https://www.mdpi.com/1996-1073/15/1/309 |
| work_keys_str_mv | AT jungbosim performanceanalysisoforganicrankinecyclewiththeturbineembeddedinageneratorteg AT sejinyook performanceanalysisoforganicrankinecyclewiththeturbineembeddedinageneratorteg AT youngwonkim performanceanalysisoforganicrankinecyclewiththeturbineembeddedinageneratorteg |