Patents Assigned to Hans Foerster
  • Refrigeration method and apparatus
    Patent number: 5699672
    Abstract: The invention relates to a novel refrigeration method and apparatus in which air is used as coolant and primary refrigerant. The air is subjected to substantially isothermal compression in a water-injected screw-type compressor, cooling in first and second scrubber columns operated by separate refrigerant circuits, and subsequent adiabatic substantially isentropic expansion in a high-speed turbine. Heat exchangers may be provided for the removal of residual coldness from the expanded air and for preheating the air fed to the compressor.
    Type: Grant
    Filed: March 11, 1996
    Date of Patent: December 23, 1997
    Assignee: Hans Foerster
    Inventors: Hans Foerster, Wolfgang Leser