The design of spiral tube heat exchangers consists of many tubes arranged in multiple layers of helical coils, around a center pipe. This tube bundle is enclosed in a cylindrical pressure vessel. The fluid on the tube side and on the shell side flows in opposite directions, making the equipment a true countercurrent heat exchanger.
On the Tube Side
The helix-pattern flow in the tubes creates, thanks to the centrifugal forces, a secondary flow consisting of a pair of vortices enhancing the heat transfer coefficient at the peripheral of the tubes.
Spiral tubes are coiled layer by layer in opposite direction to have a homogeneous heat transfer all along the exchanger.
On the Shell Side
The high turbulence flow is created by the patented design of the tube coils. The variation of the fluid velocity between the tubes creates a pulse-surge collision flow regime increasing subsequently the heat exchange coefficient outside the tubes.
The possibility of fouling is greatly limited by the non-baffle design, the turbulence of the fluid and the very low surface roughness of the tubes.
Lianhua Road, Jiaochuan Street, Zhenhai District, Ningbo City,Zhejiang Province, China