Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers
Heat exchangers are the most important equipment in refrigeration processes. Design and modeling of heat exchangers operating at low temperatures are different from other regular heat exchangers. This study includes two sections. In the first section, design and modeling considerations needed for ev...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR
2019-02-01
|
| Series: | Iranian Journal of Chemistry & Chemical Engineering |
| Subjects: | |
| Online Access: | http://www.ijcce.ac.ir/article_29774_95143670834e1b357a6e484b9ef73e91.pdf |
| _version_ | 1828267668362231808 |
|---|---|
| author | Ali Saberimoghaddam Mohammad Mahdi Bahri Rasht Abadi |
| author_facet | Ali Saberimoghaddam Mohammad Mahdi Bahri Rasht Abadi |
| author_sort | Ali Saberimoghaddam |
| collection | DOAJ |
| description | Heat exchangers are the most important equipment in refrigeration processes. Design and modeling of heat exchangers operating at low temperatures are different from other regular heat exchangers. This study includes two sections. In the first section, design and modeling considerations needed for evaluating the real thermal behavior of heat exchangers at low temperatures were discussed. These considerations are usually neglected by researchers who have modeled the heat exchanger at low temperatures. In the second section, a counter current helically coiled tube in tube heat exchanger operating in hydrogen liquefier was modeled and simulated considering notes discussed in the first section. The model was validated compared with the data presented by literature. The results showed the small positive effect of longitudinal heat conduction on hydrogen liquefaction. The heat in-leak into cold fluid resulted in higher cold fluid outlet temperature and higher hot fluid outlet temperature. Simulations showed that the heat in-leak into cold fluid leads to limit the overdesign for cryogenic heat exchangers. A comparison between models with considering different assumptions was presented and showed that the result may vary significantly based on the regarded assumptions. |
| first_indexed | 2024-04-13T05:08:36Z |
| format | Article |
| id | doaj.art-bedfc2b35a30478097041de7abfbc8a0 |
| institution | Directory Open Access Journal |
| issn | 1021-9986 1021-9986 |
| language | English |
| last_indexed | 2024-04-13T05:08:36Z |
| publishDate | 2019-02-01 |
| publisher | Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR |
| record_format | Article |
| series | Iranian Journal of Chemistry & Chemical Engineering |
| spelling | doaj.art-bedfc2b35a30478097041de7abfbc8a02022-12-22T03:01:07ZengIranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECRIranian Journal of Chemistry & Chemical Engineering1021-99861021-99862019-02-0138124325329774Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat ExchangersAli Saberimoghaddam0Mohammad Mahdi Bahri Rasht Abadi1Department of Chemistry and Chemical Engineering, Faculty of Chemical Engineering, Malek Ashtar University of Technology (MUT), Tehran, I.R. IRANDepartment of Chemistry and Chemical Engineering, Faculty of Chemical Engineering, Malek Ashtar University of Technology (MUT), Tehran, I.R. IRANHeat exchangers are the most important equipment in refrigeration processes. Design and modeling of heat exchangers operating at low temperatures are different from other regular heat exchangers. This study includes two sections. In the first section, design and modeling considerations needed for evaluating the real thermal behavior of heat exchangers at low temperatures were discussed. These considerations are usually neglected by researchers who have modeled the heat exchanger at low temperatures. In the second section, a counter current helically coiled tube in tube heat exchanger operating in hydrogen liquefier was modeled and simulated considering notes discussed in the first section. The model was validated compared with the data presented by literature. The results showed the small positive effect of longitudinal heat conduction on hydrogen liquefaction. The heat in-leak into cold fluid resulted in higher cold fluid outlet temperature and higher hot fluid outlet temperature. Simulations showed that the heat in-leak into cold fluid leads to limit the overdesign for cryogenic heat exchangers. A comparison between models with considering different assumptions was presented and showed that the result may vary significantly based on the regarded assumptions.http://www.ijcce.ac.ir/article_29774_95143670834e1b357a6e484b9ef73e91.pdfheat exchangerlongitudinal heat conductionheat in-leaklow temperature'refrigeration |
| spellingShingle | Ali Saberimoghaddam Mohammad Mahdi Bahri Rasht Abadi Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers Iranian Journal of Chemistry & Chemical Engineering heat exchanger longitudinal heat conduction heat in-leak low temperature' refrigeration |
| title | Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers |
| title_full | Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers |
| title_fullStr | Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers |
| title_full_unstemmed | Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers |
| title_short | Thermal Design Considerations and Performance Evaluation of Cryogenic Tube in Tube Heat Exchangers |
| title_sort | thermal design considerations and performance evaluation of cryogenic tube in tube heat exchangers |
| topic | heat exchanger longitudinal heat conduction heat in-leak low temperature' refrigeration |
| url | http://www.ijcce.ac.ir/article_29774_95143670834e1b357a6e484b9ef73e91.pdf |
| work_keys_str_mv | AT alisaberimoghaddam thermaldesignconsiderationsandperformanceevaluationofcryogenictubeintubeheatexchangers AT mohammadmahdibahrirashtabadi thermaldesignconsiderationsandperformanceevaluationofcryogenictubeintubeheatexchangers |