Problem with the heat exchange efficiency of the condenser; seeking expert advice
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The heat exchange area of the condenser is theoretically quite large, yet the condensation effect is still poor and there is non-condensable gas – what could be the reason?
There are many possible factors; for example, the non-condensable gases in the mixed gas require a lower temperature to condense, or the heat exchange area of the equipment may be sufficient but the design is inadequate – such as high gas flow rates leading to entrainment of condensate, or improper structural design, and so on. As described by the original poster, a common configuration is the condenser placed in front of the vacuum pump; there are many examples of heat exchangers using internal micro-spiral corrugated fins. We can discuss this further if you’re interested. Contact information can be found in my signature.