Abstract
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 substantially influenced by entropy production in the main heat exchanger. Due to the wide-boiling refrigerant mixtures applied in MRCs, a reliable design of the heat exchangers is challenging as two-phase heat transfer and pressure drop in both fluid streams must be considered simultaneously.This contribution presents a literature review on the boiling/condensation heat transfer and pressure drop of zeotropic mixtures at low temperatures. Based on this survey, suitable correlations for the design of MRC heat exchangers are identified.
Highlights
Mixed refrigerant cycles (MRCs) consist of a Linde-Hampson refrigeration cycle operated with zeotropic refrigerant mixtures, e.g. nitrogen-hydrocarbon mixtures
Due to the wide-boiling refrigerant mixtures applied in MRCs, a reliable design of the heat exchangers is challenging as two-phase heat transfer and pressure drop in both uid streams must be considered simultaneously
MRCs consist of a Linde-Hampson refrigeration cycle operated with zeotropic refrigerant mixtures, e.g. nitrogen-hydrocarbon mixtures
Summary
MRCs consist of a Linde-Hampson refrigeration cycle operated with zeotropic refrigerant mixtures, e.g. nitrogen-hydrocarbon mixtures The use of such wide-boiling mixtures yields increased process eciencies at relatively low operating pressures in comparison to pure gases. A reliable design of this heat exchanger is challenging though, since boiling and condensation of wide-boiling mixtures have to be considered. Experimental data on the boiling and condensation characteristics of wide-boiling mixtures at cryogenic temperatures have been published [1319]. We identify correlations suitable for the heat exchanger design process, based on a literature survey on the boiling and condensation characteristics of zeotropic mixtures at low temperatures.
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