Performance of air-cooled heat exchanger with laminar, transitional, and turbulent tube flow / Dawid Taler // MATEC Web of Conferences [Dokument elektroniczny]. – 2018, Vol. 240, 8 s. : rys., wykr. – ... więcej

Performance of air-cooled heat exchanger with laminar, transitional, and turbulent tube flow / Dawid Taler // MATEC Web of Conferences [Dokument elektroniczny]. – 2018, Vol. 240, 8 s. : rys., wykr. – Tryb dostępu: https://www.matec-conferences.org/articles/matecconf/pdf/2018/99/matecconf_icchmt2018_02012.pdf. – Oznaczenie ref./art.: 02012. – Bibliogr. 16 poz., Abstr. – Section: Heat Exchangers. – Mat. konf.: XI International Conference on Computational Heat, Mass and Momentum Transfer (ICCHMT 2018), Cracow, Poland, 21-24.05.2018. – doi: 10.1051/matecconf/201824002012. – ISSN 2261-236X

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, ... więcej

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.