Evaporative condenser with helical coils and method

Gas and liquid contact apparatus – With external supply or removal of heat – Heat exchange means at or downstream of contact zone

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165110, 261DIG11, B01F 304

Patent

active

046263870

ABSTRACT:
A high efficiency evaporative condenser has spaced upper vapor supply and lower condensate collection headers coupled by a plurality of thin walled helical coils defining a plurality of helical flow paths. Maximum latent heat transfer is achieved by assuring rapid cleaning of liquid condensate from interior surfaces of the pipes cleaning the flow paths, continuous air-water wetting of the external surfaces and self-cleaning of the external surface of the coils defining the flow paths. Oil and condensate in the upper vapor supply header is provided with a flow path to the lower condensate collection header without lowering the heat transfer efficiency of the helical coils and vapor in the condensate header is vented to the vapor supply header to equalize pressure. A barometric leg is formed between the ends of the helical coil and condensate collection header to form a liquid column which exerts a negative pressure on the vapor in each helical path and prevent vapor lock. The headers are maintained in fixed relation so that the helical coils are constrained to expand radially for better self-cleaning of scale and encrustation. Air/water droplet contact with the coil is maximized due to the helical coil arrangement.

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