XPS – heat exchangers consist of two independent pressure rooms:
→ at plate side made of a pack of round corrugated plates which are alternately welded together on the circumference or on the two openings in the plates.
→ at shell side made of a cylindrical shell either fully welded, openable at one side or openable at both sides.
The gaps between the corrugated plates are forming flow channels which are flowed through alternately by a primary and secondary media. Flow directors at shell side prevent a bypass – flow between shell and plate pack.
The flow direction of both media can be arranged as counter-flow, co-current or cross-flow. The heat is transferred via the corrugated plates. When one or both media are evaporating or condensing partly or completely, it is called a two-phase application.
pict.: counter flow and multi passes
pict.: plates with H-, L- and G-corrugation
By means of deflections the media at plate side and shell side as well can be led in multi passes. This way the thermal length is increasing.
XPS plate heat exchangers are available in five sizes and with different corrugation patterns, i. e. with different corrugation angles and pressing depths.
H-plates allow high heat transfer rates caused by a high turbulent flow. L-plates are used in applications which are optimized for a minimal pressure loss. In gas / gas – applications or when the media is contaminated with solids G-plates often are used, which have larger channel cross-sections.