Heat exchanger.

摘要

A heat exchanger (1) comprises an annular vessel (10) containing a heat transfer fluid (11). Immersed in the fluid (11) is a plurality of flat spiral working tubes (15) forming part of a refrigerating circuit and also a plurality of flat spiral product tubes (20) carrying air to be cooled and thereby dried. Heat is extracted from the air in the tubes (20) by the refrigerant partly via the fluid (11) and partly via the mutual contact of adjacent alternate spirals of working and product tubes. Condensation is removed from the cooled air by a separator (28).