(1) It is a spiral-plate heat exchanger as well as a high efficiency heat exchange equipment.
(2) Volume is small; it is suitable for dealing with viscous fluid.
(3) Heat transmission section, which is a rectangular spiral passage, is rolled up and made by two pieces of metal plates with integration; total resistance of spiral passage with average curvature inside equipment is small to get the characters of high heat transmission.
(4) The blocking and stagnation problems of filth and impurities can be decreased inside spiral passage with average curvature.