Performance of air-cooled heat exchanger with laminar, transitional, and turbulent tube flow
Authors:
- Dawid Taler
Abstract
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.
- Record ID
- CUTed042a9f22c34074b94365fece730e92
- Publication categories
- ; ;
- Author
- Journal series
- MATEC Web of Conferences, ISSN , e-ISSN 2261-236X, Irregular
- Issue year
- 2018
- Vol
- 240
- Pages
- [1-8]
- Article number
- 02012
- Other elements of collation
- rys.; wykr.; Bibliografia (na s.) - 7-8; Bibliografia (liczba pozycji) - 16; Oznaczenie streszczenia - Abstr.; Numeracja w czasopiśmie - Vol. 240
- Substantive notes
- Section: Heat Exchangers
- Conference
- XI International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018), 2018, 21-05-2018 - 24-05-2018, Cracow, Polska
- Keywords in English
- heat exchanger, transitional and turbulent flow, semi-empirical relationship for the Nusselt number, empirical heat transfer relationships, mathematical model
- DOI
- DOI:10.1051/matecconf/201824002012 Opening in a new tab
- URL
- https://www.matec-conferences.org/articles/matecconf/abs/2018/99/matecconf_icchmt2018_02012/matecconf_icchmt2018_02012.html Opening in a new tab
- Language
- eng (en) English
- License
- Score (nominal)
- 15
- Additional fields
- Indeksowana w: Web of Science, Scopus
- Uniform Resource Identifier
- https://cris.pk.edu.pl/info/article/CUTed042a9f22c34074b94365fece730e92/
- URN
urn:pkr-prod:CUTed042a9f22c34074b94365fece730e92
* presented citation count is obtained through Internet information analysis, and it is close to the number calculated by the Publish or PerishOpening in a new tab system.