Experimental determination of the heat transfer coefficients of shell-and-tube heat exchangers with different hollow fiber arrangements

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26210%2F22%3APU146412" target="_blank" >RIV/00216305:26210/22:PU146412 - isvavai.cz</a>

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s10973-022-11576-1" target="_blank" >https://link.springer.com/article/10.1007/s10973-022-11576-1</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s10973-022-11576-1" target="_blank" >10.1007/s10973-022-11576-1</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Experimental determination of the heat transfer coefficients of shell-and-tube heat exchangers with different hollow fiber arrangements

Popis výsledku v původním jazyce

To maximize heat transfer in heat exchangers (HEs), it is important to enlarge the active surface area and to ensure that the whole surface is in contact with continuously flowing fluids on both sides. Progress in the last two decades led to the creation of polymeric hollow-fiber HEs (PHFHEs) that have an extensive active surface area to volume ratio. Compared to conventional metal HEs, polymeric HEs are lighter and more chemically resistant. Furthermore, the fibers PHFHEs can be organized in a specific arrangement that guarantees high heat transfer efficiency. Six shell-and-tube HEs with three different types of fiber arrangements (parallel fibers, coils, and chaotization) were compared by calculating the heat transfers and the heat transfer coefficients. Pressure drops were also measured. The experiments were conducted with a counter-current mode of operation with constant laminar flow in the fibers and gradually increased flow in the shell. The experiments proved that if the fibers are arranged in a way that secures spacing heat transfer is boosted. Compared to parallel fibers, slight improvements are seen if the fibers are shaped into coils. However, complete chaotization of the fibers is far superior. Chaotized HEs demonstrate a fourfold increase in heat flux and a twofold increase in heat transfer coefficient while reducing the pressure drop by two-thirds compared to similarly sized HEs with parallel fibers.

Název v anglickém jazyce

Experimental determination of the heat transfer coefficients of shell-and-tube heat exchangers with different hollow fiber arrangements

Popis výsledku anglicky

To maximize heat transfer in heat exchangers (HEs), it is important to enlarge the active surface area and to ensure that the whole surface is in contact with continuously flowing fluids on both sides. Progress in the last two decades led to the creation of polymeric hollow-fiber HEs (PHFHEs) that have an extensive active surface area to volume ratio. Compared to conventional metal HEs, polymeric HEs are lighter and more chemically resistant. Furthermore, the fibers PHFHEs can be organized in a specific arrangement that guarantees high heat transfer efficiency. Six shell-and-tube HEs with three different types of fiber arrangements (parallel fibers, coils, and chaotization) were compared by calculating the heat transfers and the heat transfer coefficients. Pressure drops were also measured. The experiments were conducted with a counter-current mode of operation with constant laminar flow in the fibers and gradually increased flow in the shell. The experiments proved that if the fibers are arranged in a way that secures spacing heat transfer is boosted. Compared to parallel fibers, slight improvements are seen if the fibers are shaped into coils. However, complete chaotization of the fibers is far superior. Chaotized HEs demonstrate a fourfold increase in heat flux and a twofold increase in heat transfer coefficient while reducing the pressure drop by two-thirds compared to similarly sized HEs with parallel fibers.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20303 - Thermodynamics

Projekt

<a href="/cs/project/EF16_019%2F0000753" target="_blank" >EF16_019/0000753: Centrum výzkumu nízkouhlíkových energetických technologií</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Analysis and Calorimetry

ISSN

1388-6150

e-ISSN

1588-2926

Svazek periodika

147

Číslo periodika v rámci svazku

12.9.2022

Stát vydavatele periodika

HU - Maďarsko

Počet stran výsledku

10

Strana od-do

14787-14796

Kód UT WoS článku

000852603400001

EID výsledku v databázi Scopus

2-s2.0-85137815828