Details

Title

Analytical 1D models of the wall thermal resistance of rectangular minichannels applied in heat exchangers

Journal title

Archives of Thermodynamics

Yearbook

2016

Numer

No 3

Publication authors

Keywords

General Physics and Astronomy

Divisions of PAS

Nauki Techniczne

Abstract

<jats:title>Abstract</jats:title><jats:p>The paper presents four 1-dimensional models of thermal resistance of walls in a heat exchanger with rectangular minichannels. The first model is the simplest one, with a single wall separating two fluids. The second model of the so called equivalent wall takes into account total volume of intermediate walls between layers of minichannels and of side walls of minichannels. The next two more complicated models take separately into account thermal resistance of these walls. In these two models side walls are treated as fins. The results of models comparison are presented. It is shown that thermal resistance may be neglected for metal walls but it should be taken into account for the walls made of plastics. For the case of non-neglected wall thermal resistance the optimum wall thickness was derived. Minichannel heat exchangers made of plastic are larger than those built of metal, but are significantly cheaper. It makes possible to use of such exchangers in inexpensive microscale ORC installations.</jats:p>

Publisher

The Committee on Thermodynamics and Combustion of the Polish Academy of Sciences

Date

2016

Identifier

eISSN 2083-6023 ; ISSN 1231-0956

DOI

10.1515/aoter-2016-0020

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