Hot-coldhx.PNG
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Authors David Denkenberger
Michael Brandemuehl
John Zhai
J.M.Pearce
Location Michigan, USA
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Channels not receiving the same amount of flow (flow maldistribution) is an important effectiveness loss for high effectiveness heat exchangers. This paper develops a finite difference model of a counter flow heat exchanger. For modeled scenarios very good agreement with previous studies and analytical calculations was achieved. For independent pairs of hot and cold channels, as flow rate is reduced, the effectiveness asymptotically approaches the irregularity parameter (a measure of channel flow maldistribution). With thermal coupling between pairs of channels (measured by an equivalent Peclet number), effectiveness continues to increase with decreasing flow rate. These results hold for uncorrelated flow maldistribution on both sides or no flow maldistribution on one side. However, when flow maldistribution is positively correlated, effectiveness is higher; and, when it is negatively correlated, effectiveness is lower. A number of resulting graphs illustrate the effectiveness for each channel with different flow rate and correlation. While one exemplary application is a polymer expanded microchannel heat exchanger, the model could be used for other heat exchangers.

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Manufacturing the HX with an open source laser welding system[edit | edit source]

Hxinner.jpg
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Part of MOST completed projects and publications
Type Project
Keywords heat exchangers, heating, cooling, open source hardware, designs, energy conservation, heating and cooling, laser welding, microchannel, optimization, flow maldistribution, thermal coupling, finite difference, energy efficiency
SDG Sustainable Development Goals SDG07 Affordable and clean energy
Authors Joshua M. Pearce
Published 2020
License CC-BY-SA-4.0
Impact Number of views to this page and its redirects. Updated once a month. Views by admins and bots are not counted. Multiple views during the same session are counted as one. 32
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