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what is the advantage of embossed coaxial heat exchanger?

what is the advantage of embossed coaxial heat exchanger?
Update Time:2017-09-07
  After the inner tube is embossed, the connecting surface of refrigeration between inner tube and external tube is enlarged, the heat transfer amount is increased. As we test, the heat transfer amount of embossed tube is 150% of the smooth one using the same length of tube. So the coaxial heat exchanger will be much smaller.
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