Patent ID: 7814967

Claim:
A tank for conducting a heat exchange, the tank comprising: a wall including a front side and a rear side; and a plurality of vents disposed through the wall, a first end of each of the plurality of vents opening through the front side of the wall and a second end of each of the plurality of vents opening through the rear side of the wall, the plurality of vents each including an active surface positioned between the first end and the second end and substantially conforming in at least one dimension to a logarithmic spiral, the radius of the logarithmic spiral unfolding at a constant order of growth when measured at equiangular radii, and wherein passage of a fluid through the plurality of vents and over at least a portion of the active surface of each of the plurality of vents creates a temperature differential between the front side and the rear side of the wall, the temperature differential resulting in a heat exchange through the wall.