Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow
Some air-cooled heat exchangers, especially in air conditioning and heating installations, heat pumps, as well as car radiators, work in a wide range of loads when the liquid flow in the tubes can be laminar, transitional or turbulent. In this paper, a semi-empirical and empirical relationship for t...
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| Format: | Article |
| Language: | English |
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EDP Sciences
2018-01-01
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| Series: | MATEC Web of Conferences |
| Online Access: | https://doi.org/10.1051/matecconf/201824002012 |
| _version_ | 1818445060355653632 |
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| author | Taler Dawid |
| author_facet | Taler Dawid |
| author_sort | Taler Dawid |
| collection | DOAJ |
| description | Some air-cooled heat exchangers, especially in air conditioning and heating installations, heat pumps, as well as car radiators, work in a wide range of loads when the liquid flow in the tubes can be laminar, transitional or turbulent. In this paper, a semi-empirical and empirical relationship for the Nusselt number on the liquid-side in the transitional and turbulent range was derived. The friction factor in the transition flow range Rew,trb ≤ Rew ≤ Rew,tre was calculated by linear interpolation between the values of the friction factor for Rew,trb =2,100 and Rew,tre =3,000. Based on experimental data for a car radiator, empirical heat transfer relationships for the air and water-side were found by using the least squares method. The water temperature at the outlet of the heat exchanger was calculated using P-NTU (effectiveness-number of transfer units) method. The heat flow rate from water to air was calculated as a function of the water flow rate to compare it with the experimental results. The theoretical and empirical correlation for the water-side Nusselt number developed in the paper were used when determining the heat flow rate. The calculation results agree very well with the results of the measurements. |
| first_indexed | 2024-12-14T19:25:49Z |
| format | Article |
| id | doaj.art-0a765da5358440059bd2cc7141e9b556 |
| institution | Directory Open Access Journal |
| issn | 2261-236X |
| language | English |
| last_indexed | 2024-12-14T19:25:49Z |
| publishDate | 2018-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | MATEC Web of Conferences |
| spelling | doaj.art-0a765da5358440059bd2cc7141e9b5562022-12-21T22:50:12ZengEDP SciencesMATEC Web of Conferences2261-236X2018-01-012400201210.1051/matecconf/201824002012matecconf_icchmt2018_02012Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube FlowTaler DawidSome air-cooled heat exchangers, especially in air conditioning and heating installations, heat pumps, as well as car radiators, work in a wide range of loads when the liquid flow in the tubes can be laminar, transitional or turbulent. In this paper, a semi-empirical and empirical relationship for the Nusselt number on the liquid-side in the transitional and turbulent range was derived. The friction factor in the transition flow range Rew,trb ≤ Rew ≤ Rew,tre was calculated by linear interpolation between the values of the friction factor for Rew,trb =2,100 and Rew,tre =3,000. Based on experimental data for a car radiator, empirical heat transfer relationships for the air and water-side were found by using the least squares method. The water temperature at the outlet of the heat exchanger was calculated using P-NTU (effectiveness-number of transfer units) method. The heat flow rate from water to air was calculated as a function of the water flow rate to compare it with the experimental results. The theoretical and empirical correlation for the water-side Nusselt number developed in the paper were used when determining the heat flow rate. The calculation results agree very well with the results of the measurements.https://doi.org/10.1051/matecconf/201824002012 |
| spellingShingle | Taler Dawid Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow MATEC Web of Conferences |
| title | Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow |
| title_full | Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow |
| title_fullStr | Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow |
| title_full_unstemmed | Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow |
| title_short | Performance of Air-Cooled Heat Exchanger with Laminar, Transitional, and Turbulent Tube Flow |
| title_sort | performance of air cooled heat exchanger with laminar transitional and turbulent tube flow |
| url | https://doi.org/10.1051/matecconf/201824002012 |
| work_keys_str_mv | AT talerdawid performanceofaircooledheatexchangerwithlaminartransitionalandturbulenttubeflow |