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DOI: 10.5445/IR/1000078812
DOI: 10.1088/1757-899X/278/1/012061

Micro-structured heat exchanger for cryogenic mixed refrigerant cycles

Gomse, D; Reiner, A; Rabsch, G; Gietzelt, T; Brandner, J J; Grohmann, S

Mixed refrigerant cycles (MRCs) offer a cost- and energy-efficient cooling method for the temperature range between 80 and 200 K. The performance of MRCs is strongly influenced by entropy production in the main heat exchanger. High efficiencies thus require small temperature gradients among the fluid streams, as well as limited pressure drop and axial conduction. As temperature gradients scale with heat flux, large heat transfer areas are necessary. This is best achieved with micro-structured heat exchangers, where high volumetric heat transfer areas can be realized. The reliable design of MRC heat exchangers is challenging, since two-phase heat transfer and pressure drop in both fluid streams have to be considered simultaneously. Furthermore, only few data on the convective boiling and condensation kinetics of zeotropic mixtures is available in literature. This paper presents a micro-structured heat exchanger designed with a newly developed numerical model, followed by experimental results on the single-phase pressure drop and their implications on the hydraulic diameter.

Zugehörige Institution(en) am KIT Institut für Mikroverfahrenstechnik (IMVT)
Institut für Technische Physik (ITEP)
Institut für Technische Thermodynamik und Kältetechnik (ITTK)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator URN: urn:nbn:de:swb:90-788129
KITopen ID: 1000078812
HGF-Programm 37.06.02; LK 01
Erschienen in IOP Conference Series: Materials Science and Engineering
Band 278
Seiten Art.Nr. 012061
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