Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms
A comparative analysis of the flow boiling characteristics of R450A, R515B, and R1234ze(E) inside a 7.0 mm OD microfin tube was performed. The mass velocity was explored from low values, starting from 50 kg m<sup>−2</sup> s<sup>−1</sup>, up to 400 kg m<sup>−2</sup>...
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/23/12450 |
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| author | Yuce Liu Luisa Rossetto Andrea Diani |
| author_facet | Yuce Liu Luisa Rossetto Andrea Diani |
| author_sort | Yuce Liu |
| collection | DOAJ |
| description | A comparative analysis of the flow boiling characteristics of R450A, R515B, and R1234ze(E) inside a 7.0 mm OD microfin tube was performed. The mass velocity was explored from low values, starting from 50 kg m<sup>−2</sup> s<sup>−1</sup>, up to 400 kg m<sup>−2</sup> s<sup>−1</sup>, and the heat flux was tested in the range of 10–50 kW m<sup>−2</sup>, keeping a constant saturation temperature of 30 °C at the inlet of the test section. R515B and R1234ze(E) showed similar values of the heat transfer coefficient and frictional pressure gradient under all the investigated working conditions. R450A showed lower values of the heat transfer coefficient, especially at low heat flux and high mass velocity, compared to R515B and R1234ze(E), but the gap of the heat transfer performance between the three fluids reduced at high heat flux. The frictional pressure drops of R450A were generally lower than those of R515B and R1234ze(E). In the end, some correlations for the evaluation of both the heat transfer coefficient and the pressure drop were selected, and the estimated values were compared against the experimental counterpart. Furthermore, the effects of nucleate boiling and of convective boiling, as well as of the temperature glide for R450A, were analyzed and estimated. |
| first_indexed | 2024-03-09T17:52:29Z |
| format | Article |
| id | doaj.art-9b8328c5ba82444d9a7326870904993a |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-09T17:52:29Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-9b8328c5ba82444d9a7326870904993a2023-11-24T10:36:43ZengMDPI AGApplied Sciences2076-34172022-12-0112231245010.3390/app122312450Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling MechanismsYuce Liu0Luisa Rossetto1Andrea Diani2School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049, ChinaDepartment of Industrial Engineering, University of Padova, 35131 Padova, ItalyDepartment of Industrial Engineering, University of Padova, 35131 Padova, ItalyA comparative analysis of the flow boiling characteristics of R450A, R515B, and R1234ze(E) inside a 7.0 mm OD microfin tube was performed. The mass velocity was explored from low values, starting from 50 kg m<sup>−2</sup> s<sup>−1</sup>, up to 400 kg m<sup>−2</sup> s<sup>−1</sup>, and the heat flux was tested in the range of 10–50 kW m<sup>−2</sup>, keeping a constant saturation temperature of 30 °C at the inlet of the test section. R515B and R1234ze(E) showed similar values of the heat transfer coefficient and frictional pressure gradient under all the investigated working conditions. R450A showed lower values of the heat transfer coefficient, especially at low heat flux and high mass velocity, compared to R515B and R1234ze(E), but the gap of the heat transfer performance between the three fluids reduced at high heat flux. The frictional pressure drops of R450A were generally lower than those of R515B and R1234ze(E). In the end, some correlations for the evaluation of both the heat transfer coefficient and the pressure drop were selected, and the estimated values were compared against the experimental counterpart. Furthermore, the effects of nucleate boiling and of convective boiling, as well as of the temperature glide for R450A, were analyzed and estimated.https://www.mdpi.com/2076-3417/12/23/12450microfin tubeflow boilingR450AR515BR1234ze(E)heat transfer coefficient |
| spellingShingle | Yuce Liu Luisa Rossetto Andrea Diani Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms Applied Sciences microfin tube flow boiling R450A R515B R1234ze(E) heat transfer coefficient |
| title | Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms |
| title_full | Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms |
| title_fullStr | Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms |
| title_full_unstemmed | Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms |
| title_short | Flow Boiling of R450A, R515B, and R1234ze(E) Inside a 7.0 mm OD Microfin Tube: Experimental Comparison and Analysis of Boiling Mechanisms |
| title_sort | flow boiling of r450a r515b and r1234ze e inside a 7 0 mm od microfin tube experimental comparison and analysis of boiling mechanisms |
| topic | microfin tube flow boiling R450A R515B R1234ze(E) heat transfer coefficient |
| url | https://www.mdpi.com/2076-3417/12/23/12450 |
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