Does steam flow from top to bottom or bottom to top

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Steam flow in a heat exchanger is influenced by the injection point, which varies based on the type of heat exchanger and steam service. In systems with a separate condensate return pipe, steam should be injected at a high point to prevent condensate pooling. Conversely, in a one-pipe system, steam is injected low, allowing condensate to flow back down the same pipe. The design of the system dictates the optimal steam and condensate flow arrangement. Understanding these dynamics is crucial for efficient heat exchanger operation.
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does steam flow from top to bottom or bottom to top in a heat exchanger
 
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That would depend upon where it's injected.
 
Which depends on the type of heat exchanger and steam service. If there is a separate condensate return pipe, you probably want the steam injected high and the condensate returning low so the condensate doesn't pool-up anywhere. If it is a one-pipe system, the steam is injected low and the condensate just runs back down the same pipe, past the up-flowing steam.
 

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