Air conditioning system for electronic instrument cabinets

Claim 1

IN AN AIR CONDITIONING SYSTEM FOR AN ENCLOSURE, WHICH INCLUDES A MIXING CHAMBER WHEREIN AMBIENT AIR MAY BE MIXED WITH COOLED HUMIDITY CONTROLLED AIR FREE FROM LIQUID WATER AT ATMOSPHERIC PRESSURE DELIVERED TO SAID MIXING CHAMBER FROM A REMOTE MEANS; MEANS FOR SUPPLYING SAID COOLED HUMIDITY CONTROLLED AIR FREE FROM LIQUID WATER AT ATMOSPHERIC PRESSURE INCLUDING A MOTOR DRIVEN AXIAL AIR COMPRESSOR TO COMPRESS AMBIENT AIR FROM ABOUT TWO TO FOUR ATMOSPHERES PRESSURE; MEANS TO COOL SAID COMPRESSED AIR BELOW AMBIENT TEMPERATURE; TRAP MEANS FOR REMOVING CONDENSED WATER FROM SAID COOLED COMPRESSED AIR WHEREBY TO AT LEAST PARTLY DEHUMIDIFY IT; A HEAT-INSULATED TURBINE AIR-EXPANDER WHOSE CASING, SHAFT, AND ROTOR ARE MADE OF NON-METALLIC MATERIAL HAVING LOW HEAT CONDUCTIVITY AND LOW HEAT CAPACITANCE, ADAPTED TO ADIABATICALLY EXPAND COMPRESSED AND PARTLY DEHUMIDIFIED AIR SUPPLIED THERETO; AND LOADING MEANS OPERATIVELY CONNECTED TO SAID AIR-EXPANDER.