Abstract
This paper reports theoretical and experimental results on ammonia heat and mass transfer coefficient in evaporative condensers. The theoretical study, based on the review performed by the authors, uses currently available correlations in open literature and presents modeling results.The experimental study was carried out on specially designed set-ups that allowed both measuring and acquisition of data and aimed to determine: mass transfer coefficient at water/air interface; heat transfer coefficient at tube wall/water interface; heat transfer coefficient at condensing refrigerant/tube wall interface. Experimental and theoretical values were further compared, in order to validate the correlations used, under specific geometrical configuration of the evaporative condenser under study and specific operating conditions. The paper concluded that all correlations used describe, more or less accurately, the heat and mass transfer process in ammonia evaporative condensers and performs a comparative analysis of the results, based on deviation shown with respect to experimental values.The paper also addresses the current ecological aspect implied by refrigerants, by choosing ammonia, a natural, environmentally friendly refrigerant, known for its zero ozone depleting potential and zero global warming effect.
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