What is counter-current operation in a heat exchanger?
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How is series and parallel connection operated within each heat exchanger?
Is it series and parallel connection between the various heat exchangers? Series connection cannot be controlled; everything has to be released. For parallel connection, the effect of natural distribution should be considered; artificial adjustment of the flow division should only be carried out when necessary and if conditions permit.
It can be connected in series or parallel; it just involves switching valves
In series, there is one stage or two stages of heat exchange; in parallel, the switching valve can be used depending on the operating conditions