Perforated fin heat and mass transfer device

A fluid heat exchange device comprising:

• a substantially vertical surface separating a first fluid space and a second fluid space, the substantially vertical surface being thermally conductive to allow heat transfer between the first fluid space and the second fluid space;
• the first fluid space containing a downward flowing fluid;
• the second fluid space containing a second fluid;
• an angled fin in the first fluid space, the angled fin having a first edge adjacent the substantially vertical surface, the angled fin angling upward from the first edge to create a downward flowing fluid collection space adjacent the substantially vertical surface;
• the angled fin having a house-shaped perforation to allow a flow of downward flowing fluid through the angled fin.