Design of Umbrella-Deck Spray Condenser

The character of heat transfer in umbrella deck spray condensers used in polyester manufactuing is studied. A simple curtain style mathematical model of fransfer is derived based on an analysis of the mechanism of transfer, and a general method on the design of condensers is taken relating the height of liquid sheet to the average overall heat transfer coefficient through solving the heat transfer equation of the liquid sheet and considering the limit to vapor phase entrainment and pressure drop. Test verifications indicated good agreement between experimental and calculated data. This method has been adopted in the industrial design by China Textile Industrial Engineering Institute.