CASCADE REFRIGERATING UNIT Russian patent published in 2015 - IPC F25B7/00 

FIELD: heating.

SUBSTANCE: invention can be used in conditioning systems, in food and chemical industry. Cascade refrigerating unit with different work media of cascades consists single-stage machines referred to as the bottom and the top cascade legs and connected by a common condenser evaporator, and includes compressors, heat exchangers, thermoinsulated frost accumulator. Top cascade leg is open and uses R718 work medium (water or aqueous solutions of salts) replenished from outside as frost carrier, where minor part of water is evaporated to remove total heat input, vacuumised condenser evaporator is connected to vacuum pump for water vapour removal to ambient environment. Bottom cascade leg is open and uses ambient air, and/or is closed, and condensers of bottom cascade leg are positioned inside the vacuumised evaporator of top cascade leg condenser.

EFFECT: stable operation of cascade refrigerating unit regardless of ambient temperature.

2 dwg