METHOD OF PRODUCTION OF COLD IN TURBO-REFRIGERATING UNIT Russian patent published in 2002 - IPC

FIELD: air- conditioning systems, engine cooling systems, air-conditioning of pressurized cabins and compartments of flying vehicles. SUBSTANCE: production of cold in turbo-refrigerating unit is effected through expansion of compressed gas in cooling turbine at reduction of its temperature and transfer of mechanical energy to braking unit kinematically linked with turbine rotor. Optimal rotation speed of rotor set for operation of unit corresponds to maximum efficiency of turbine. Then, the following measurements are made: temperature and pressure at turbine inlet, after-turbine pressure of gas and rotational speed of rotor. Then, present magnitude of corrected rotational speed of rotor which is dependent on said magnitudes of working parameters is determined. If present magnitude is lesser than preset optimal magnitude of corrected rotational speed, braking torque to rotor is reduced. Braking torque of rotor is changed through acting on braking unit till preset and present magnitudes of corrected rotational speeds become equal. Hydraulic pump or turbocompressor (fan) or electric generator may be used as braking unit. EFFECT: possibility of maintaining maximum efficiency and cooling effect of turbine in wide range of modes of operation. 4 cl, 1 dwg