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"Single-Line" coldfinger evaporator connection?

"Single-Line" coldfinger evaporator connection?

"Single-Line" coldfinger evaporator connection?

(OP)
Hi,

I have a "coldfinger" unit consisting of a compressor joined to a flatish-tube spiral coldfinger by a flexible line. What's a bit strange to me is that in this unit and in similar units I've seen, it appears as if there is a single line to the coldfinger. I've considered the possibility that liquid and vapor pass each other in opposite directions through this tube, but I don't _think_ there are any restrictions on relative position of the two, and I would think that a scheme like this would be dependent on gravity. Or can it be packed or lined with material to "wick" the liquid in? Am I simply missing the fact that there are two lines internal to the "umbilical"? Perhaps even coaxial?

-Jeff

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