22
23
3.3 Flow rates
Flow rates should be kept as near as possible to the design values. Lower flow rates can
cause unexpected changes to the heat exchanger and make the plate surfaces dirty. If
a heat exchanger with essentially greater flow rates is required, please ask us to check
the suitability of the exchanger.
4 Operation
4.1 Principle of the Heat Exchanger
The purpose of a heat exchanger is to transfer heat from one to another flow of fluid via
a corrugated heat transfer plate.
The construction is such that the flows alternate through the plate pack. The flows can
be controlled as counter-current, co-current or cross-flow.
Structure of the Vahterus Plate & Shell heat exchanger
The Plate & Shell heat exchanger consists of circular plates welded into a pack, which
is then mounted in a pressure vessel.
The flow on the plate side is through the connections on the end plates via the plate pack.
The flow on the shell side is through the shell connections via the plate pack using a
flow director.
The construction may be either fully welded or openable. The openable type has a re-
movable cover plate so that the plate pack can be taken out.
The following are the various applications of a PSHE exchanger:
