This design is useful when you have limited space, especially when the vapor is going up the tubes and the distillate coming down - the situation with a condenser on top of a column. A limitation of this design is that the tubes have to be at least 7mm inch) internal diameter or you may experience choking, where the surface tension of the distillate causes the liquid to block the tubes. This is the same effect that causes liquid to remain in the bottom portion of a drinking straw.
Although construction of either variation is quite straightforward, you need to be very accurate when drilling all the holes in the end plates that hold the tubes in place. This is not recommended for your first project!
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