Refrigeration – Processes – Employing diverse materials or particular material in...
Patent
1997-09-09
1999-09-28
Kilner, Christopher B.
Refrigeration
Processes
Employing diverse materials or particular material in...
62 512, 252 67, C09K 504, F25B 1902
Patent
active
059569581
ABSTRACT:
A miniature mixed gas refrigeration system and method of operation are disclosed, having a coaxial catheter with an inner high pressure supply lumen and an outer low pressure return lumen. An optimum gas mixture is formulated from a group of component fluids, according to calculated thermodynamic properties of a group of candidate fluid mixtures. 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 183K. 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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Second list of abstracts related to perforated plate heat exchangers, compiled for the applicant through a computer data base search; list not published.
Dobak III John D.
Huber Marcia L.
Marquardt Eric D.
Radebaugh Ray
CryoGen, Inc.
Kilner Christopher B.
Spinks Gerald W.
The United States of America as represented by the Secretary of
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