Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions
This paper presents the design optimization of a heat exchanger for a free-piston Stirling engine (FPSE) through an improved quasi-steady flow (iQSF) model and a central composite design. To optimize the tubular hot heat exchanger (HHX) design, a design set of central composite designs for the desig...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2022-05-01
|
| Series: | Energies |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1996-1073/15/9/3326 |
| _version_ | 1797504954872627200 |
|---|---|
| author | Dong-Jun Kim Yeongchae Park Tae Young Kim Kyuho Sim |
| author_facet | Dong-Jun Kim Yeongchae Park Tae Young Kim Kyuho Sim |
| author_sort | Dong-Jun Kim |
| collection | DOAJ |
| description | This paper presents the design optimization of a heat exchanger for a free-piston Stirling engine (FPSE) through an improved quasi-steady flow (iQSF) model and a central composite design. To optimize the tubular hot heat exchanger (HHX) design, a design set of central composite designs for the design factors of the HHX was constructed and the brake power and efficiency were predicted through the iQSF model. The iQSF model is improved because it adds various heat and power losses based on the QSF model and applies a heat transfer model that simulates the oscillating flow condition of an actual Stirling engine. Based on experimental results from the RE-1000, an FPSE developed by Sunpower, the iQSF model significantly improves the prediction error of the indicated power from 66.9 to 24.9% compared to the existing QSF model. For design optimization of the HHX, the inner diameter and the number of tubes with the highest brake power and efficiency were determined using a regression model, and the tube length was determined using the iQSF model. Finally, the brake output and efficiency of FPSE with the optimized HHX were predicted to be 7.4 kW and 36.4%, respectively, through the iQSF analysis results. |
| first_indexed | 2024-03-10T04:11:46Z |
| format | Article |
| id | doaj.art-0f43451fa4884140b6ecfc0ed91e7fa0 |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T04:11:46Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-0f43451fa4884140b6ecfc0ed91e7fa02023-11-23T08:09:44ZengMDPI AGEnergies1996-10732022-05-01159332610.3390/en15093326Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model PredictionsDong-Jun Kim0Yeongchae Park1Tae Young Kim2Kyuho Sim3Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, KoreaDepartment of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, KoreaDepartment of Mechanical and Automotive Engineering, Seoul National University of Science and Technology, Seoul 01811, KoreaDepartment of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, KoreaThis paper presents the design optimization of a heat exchanger for a free-piston Stirling engine (FPSE) through an improved quasi-steady flow (iQSF) model and a central composite design. To optimize the tubular hot heat exchanger (HHX) design, a design set of central composite designs for the design factors of the HHX was constructed and the brake power and efficiency were predicted through the iQSF model. The iQSF model is improved because it adds various heat and power losses based on the QSF model and applies a heat transfer model that simulates the oscillating flow condition of an actual Stirling engine. Based on experimental results from the RE-1000, an FPSE developed by Sunpower, the iQSF model significantly improves the prediction error of the indicated power from 66.9 to 24.9% compared to the existing QSF model. For design optimization of the HHX, the inner diameter and the number of tubes with the highest brake power and efficiency were determined using a regression model, and the tube length was determined using the iQSF model. Finally, the brake output and efficiency of FPSE with the optimized HHX were predicted to be 7.4 kW and 36.4%, respectively, through the iQSF analysis results.https://www.mdpi.com/1996-1073/15/9/3326free-piston Stirling engineimproved quasi-steady flow modeldesign of experimentsheat exchanger |
| spellingShingle | Dong-Jun Kim Yeongchae Park Tae Young Kim Kyuho Sim Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions Energies free-piston Stirling engine improved quasi-steady flow model design of experiments heat exchanger |
| title | Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions |
| title_full | Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions |
| title_fullStr | Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions |
| title_full_unstemmed | Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions |
| title_short | Design Optimization of Tubular Heat Exchangers for a Free-Piston Stirling Engine Based on Improved Quasi-Steady Flow Thermodynamic Model Predictions |
| title_sort | design optimization of tubular heat exchangers for a free piston stirling engine based on improved quasi steady flow thermodynamic model predictions |
| topic | free-piston Stirling engine improved quasi-steady flow model design of experiments heat exchanger |
| url | https://www.mdpi.com/1996-1073/15/9/3326 |
| work_keys_str_mv | AT dongjunkim designoptimizationoftubularheatexchangersforafreepistonstirlingenginebasedonimprovedquasisteadyflowthermodynamicmodelpredictions AT yeongchaepark designoptimizationoftubularheatexchangersforafreepistonstirlingenginebasedonimprovedquasisteadyflowthermodynamicmodelpredictions AT taeyoungkim designoptimizationoftubularheatexchangersforafreepistonstirlingenginebasedonimprovedquasisteadyflowthermodynamicmodelpredictions AT kyuhosim designoptimizationoftubularheatexchangersforafreepistonstirlingenginebasedonimprovedquasisteadyflowthermodynamicmodelpredictions |