Refrigeration – Cryogenic treatment of gas or gas mixture – Liquefaction
Patent
1995-10-12
2000-11-28
Capossela, Ronald
Refrigeration
Cryogenic treatment of gas or gas mixture
Liquefaction
62293, 606 23, 606 24, F25B 1902
Patent
active
061519014
ABSTRACT:
A miniature mixed gas refrigeration system is disclosed, having a coaxial catheter with an inner high pressure supply lumen and an outer low pressure return lumen. The gas mixture is pressurized by a compressor to a pressure less than 420 psia, for safety reasons. The distal portion of the outer lumen contains a micro-miniature heat exchanger constructed of laminated plates or sheets. The plates or sheets establish high pressure and low pressure passageways, with high surface area, having a tortuous path for the gas flow to maximize heat exchange. The high pressure outlet of the heat exchanger is connected to a Joule-Thomson expansion element where the high pressure gas is expanded isenthalpically to a lower temperature at least as low as 180K. This low temperature gas cools a heat transfer element mounted in the outer wall of the catheter, to cool an external object. Return gas flows back through the heat exchanger to pre-cool the incoming high pressure gas mixture.
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Dobak III John D.
Huber Marcia L.
Marquardt Eric D.
Radebaugh Ray
Capossela Ronald
CryoGen, Inc.
Spinks Gerald W.
The United States of America as represented by the Secretary of
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