Critical review of available correlations for two-phase flow heat transfer of ammonia

Abstract Although ammonia has been used for decades as a refrigerant of choice for selected large- and small-scale applications, no formal database is available on heat transfer of ammonia. A critical review of the published literature on heat transfer of ammonia is provided in this paper. The available correlations for in-tube and external boiling/evaporation and condensation heat transfer of ammonia are discussed and evaluated where possible. Supported by the findings of this effort, research areas of relevance that can contribute to expanded use of ammonia as an environmentally friendly refrigerant are suggested.

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