A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes
This work presents a multi-node lumped parameter model able to predict the steady and transient behavior of capillary heat pipes, taking into account the effects of gravity (orientation angle) and the real gas effects in the vapor modeling. The model was validated against experimental results acquir...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-03-01
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| Series: | Fluids |
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| Online Access: | https://www.mdpi.com/2311-5521/7/3/109 |
| _version_ | 1797471682097577984 |
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| author | Roberta Caruana Luciano Gallazzi Romano Iazurlo Maurizio Marcovati Manfredo Guilizzoni |
| author_facet | Roberta Caruana Luciano Gallazzi Romano Iazurlo Maurizio Marcovati Manfredo Guilizzoni |
| author_sort | Roberta Caruana |
| collection | DOAJ |
| description | This work presents a multi-node lumped parameter model able to predict the steady and transient behavior of capillary heat pipes, taking into account the effects of gravity (orientation angle) and the real gas effects in the vapor modeling. The model was validated against experimental results acquired by Leonardo S.p.A., which were obtained by simulating the behavior of a heat pipe embedded in a chassis cover, subject to seven cycles of transient thermal loading. After the validation, the analysis is focused on the model accuracy when using the ideal and real gas assumptions, using different working fluids (water, ammonia, acetone, HFC134a). The results showed that when using water or ammonia as working fluid, the error in modeling the vapor as an ideal instead of as real gas is negligible, both for the vapor temperatures and pressures predictions. On the contrary, when using acetone or HFC134a as working fluid, modeling the vapor as a real gas leads to a significant increase in the accuracy of the vapor pressure predictions. |
| first_indexed | 2024-03-09T19:51:39Z |
| format | Article |
| id | doaj.art-dac72508c65c42a68f0d4ae99dd2e2d7 |
| institution | Directory Open Access Journal |
| issn | 2311-5521 |
| language | English |
| last_indexed | 2024-03-09T19:51:39Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fluids |
| spelling | doaj.art-dac72508c65c42a68f0d4ae99dd2e2d72023-11-24T01:09:31ZengMDPI AGFluids2311-55212022-03-017310910.3390/fluids7030109A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat PipesRoberta Caruana0Luciano Gallazzi1Romano Iazurlo2Maurizio Marcovati3Manfredo Guilizzoni4Department of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milan, ItalyElectronics Division, Leonardo S.p.A., ItalyElectronics Division, Leonardo S.p.A., ItalyElectronics Division, Leonardo S.p.A., ItalyDepartment of Energy, Politecnico di Milano, Via Lambruschini 4, 20156 Milan, ItalyThis work presents a multi-node lumped parameter model able to predict the steady and transient behavior of capillary heat pipes, taking into account the effects of gravity (orientation angle) and the real gas effects in the vapor modeling. The model was validated against experimental results acquired by Leonardo S.p.A., which were obtained by simulating the behavior of a heat pipe embedded in a chassis cover, subject to seven cycles of transient thermal loading. After the validation, the analysis is focused on the model accuracy when using the ideal and real gas assumptions, using different working fluids (water, ammonia, acetone, HFC134a). The results showed that when using water or ammonia as working fluid, the error in modeling the vapor as an ideal instead of as real gas is negligible, both for the vapor temperatures and pressures predictions. On the contrary, when using acetone or HFC134a as working fluid, modeling the vapor as a real gas leads to a significant increase in the accuracy of the vapor pressure predictions.https://www.mdpi.com/2311-5521/7/3/109heat pipelumped parameter approachtransient analysisreal gas effects |
| spellingShingle | Roberta Caruana Luciano Gallazzi Romano Iazurlo Maurizio Marcovati Manfredo Guilizzoni A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes Fluids heat pipe lumped parameter approach transient analysis real gas effects |
| title | A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes |
| title_full | A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes |
| title_fullStr | A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes |
| title_full_unstemmed | A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes |
| title_short | A Multi-Node Lumped Parameter Model Including Gravity and Real Gas Effects for Steady and Transient Analysis of Heat Pipes |
| title_sort | multi node lumped parameter model including gravity and real gas effects for steady and transient analysis of heat pipes |
| topic | heat pipe lumped parameter approach transient analysis real gas effects |
| url | https://www.mdpi.com/2311-5521/7/3/109 |
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