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- W2068819212 abstract "This paper presents a review of differences and similarities of in-tube heat transfer and pressure drop between ammonia (NH 3 ) and carbon dioxide (CO 2 ) from the perspective of the design of heat exchangers for NH 3 two-stage and CO 2 /NH 3 cascade refrigeration systems. The focus is on differences in thermophysical properties and thus different characteristics of heat transfer and pressure drop. A brief summary of published literatures about CO 2 /NH 3 cascade refrigeration systems is provided and literature review of available correlations and developed correlations are presented for flow boiling and condensation heat transfer and pressure drop. Because of large deviation of calculated values with exiting correlations from measured results, a new correlation to predict flow condensation heat transfer coefficients was developed based on experimental results for CO 2 at -15°C. From comparison of measured and predicted values, it is shown that some correlations, previously published in open literature, can be used to calculate flow boiling heat transfer coefficients for NH 3 at -20°C, if a flow pattern can be appropriately determined for a flow condition. Also, it is presented that existing correlations can predict well the heat transfer coefficients for CO 2 flow boiling at -15 and -30°C. It is shown that some correlations can predict pressure drop relatively well for NH 3 and CO 2 two-phase flow. The NH 3 and CO 2 flow evaporation heat transfer and pressure drop characteristics at -40°C are compared with predicted values." @default.
- W2068819212 created "2016-06-24" @default.
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- W2068819212 date "2010-06-01" @default.
- W2068819212 modified "2023-10-16" @default.
- W2068819212 title "PURE NH3 AND CO2 HEAT TRANSFER AND PRESSURE DROP IN HORIZONTAL SMOOTH TUBES FOR NH3 TWO-STAGE AND NH3/CO2 CASCADE REFRIGERATION SYSTEMS: A REVIEW" @default.
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- W2068819212 doi "https://doi.org/10.1142/s2010132510000198" @default.
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