Degradation of the performance of microchannel heat exchangers due to flow maldistribution

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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@article{7f63ca6d718d4cf7a65834625608e8b3,
title = "Degradation of the performance of microchannel heat exchangers due to flow maldistribution",
keywords = "Microchannels, Flow maldistribution, Thermal cross talk, Parallel plates",
author = "Nielsen, {Kaspar Kirstein} and Kurt Engelbrecht and Dennis Christensen and Jensen, {Jesper Buch} and Anders Smith and Christian Bahl",
year = "2012",
doi = "10.1016/j.applthermaleng.2012.02.019",
volume = "40",
pages = "236--247",
journal = "Applied Thermal Engineering",
issn = "1359-4311",
publisher = "Pergamon Press",

}

RIS

TY - JOUR

T1 - Degradation of the performance of microchannel heat exchangers due to flow maldistribution

AU - Nielsen,Kaspar Kirstein

AU - Engelbrecht,Kurt

AU - Christensen,Dennis

AU - Jensen,Jesper Buch

AU - Smith,Anders

AU - Bahl,Christian

PY - 2012

Y1 - 2012

N2 - The effect of flow maldistribution on the performance of microchannel parallel plate heat exchangers is investigated using an established single blow numerical model and cyclic steady-state regenerator experiments. It is found that as the variation of the individual channel thickness in a particular stack (heat exchanger) increases the actual performance of the heat exchanger decreases significantly, deviating from the expected nominal performance. We show that this is due to both the varying fluid flow velocities in each individual channel and the thermal cross talk between the channels transverse to the direction of the flow.

AB - The effect of flow maldistribution on the performance of microchannel parallel plate heat exchangers is investigated using an established single blow numerical model and cyclic steady-state regenerator experiments. It is found that as the variation of the individual channel thickness in a particular stack (heat exchanger) increases the actual performance of the heat exchanger decreases significantly, deviating from the expected nominal performance. We show that this is due to both the varying fluid flow velocities in each individual channel and the thermal cross talk between the channels transverse to the direction of the flow.

KW - Microchannels

KW - Flow maldistribution

KW - Thermal cross talk

KW - Parallel plates

U2 - 10.1016/j.applthermaleng.2012.02.019

DO - 10.1016/j.applthermaleng.2012.02.019

M3 - Journal article

VL - 40

SP - 236

EP - 247

JO - Applied Thermal Engineering

T2 - Applied Thermal Engineering

JF - Applied Thermal Engineering

SN - 1359-4311

ER -