The aim of this work is to present a critical examination of both the available experimental data and the performance of the available heat transfer correlations for oil-free ammonia horizontal in-tube boiling at fin-and-tube-type air-to-refrigerant liquid overfeed evaporation conditions. First, a selection and comparison of the experimental database found in the open literature at the mentioned working conditions is presented. Subsequently, after a short description of the most relevant heat transfer correlations, and in accordance with the selected data, a detailed analysis of the performance of each correlation is carried out. Results show an important divergence between the experimental data sets and conclude that the presently available correlations show considerable discrepancies in heat transfer coefficients within the selected conditions.

Issue Section:
Technical Briefs
Keywords:
boiling, evaporation, heat transfer, pipe flow, pipes, refrigeration, two-phase flow, ammonia in-tube boiling, two-phase flow boiling correlations, heat transfer coefficient, liquid overfeed refrigeration systems
Topics:
Boiling, Evaporation, Flow (Dynamics), Heat transfer, Heat transfer coefficients, Flux (Metallurgy), Heat, Refrigerants, Databases, Refrigeration, Two-phase flow
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