System for deicing an external evaporator for heat pump systems

A system for deicing an external evaporator for heat pump systems, said heat pump system comprising at least one compressor, at least one internal condenser, at least one external evaporator, at least one liquid separator, and a system of ducts for cooling fluid, said deicing system comprising:

• a secondary refrigeration circuit, connected in input and in output to said heat pump system and adapted to convey cooling fluid, which comprises a tank for storing a heat transfer fluid, and a first heat exchanger immersed in said heat transfer fluid and adapted to transfer heat to said heat transfer fluid by cooling said cooling fluid;
• a bypass refrigeration circuit, connected in input and in output to said heat pump system and adapted to convey cooling fluid, which comprises said tank, and a second heat exchanger immersed in said heat transfer fluid and adapted to absorb heat from said heat transfer fluid by heating said cooling fluid;
• and
• a deicing circuit connected in input and in output to said heat pump system and adapted to convey cooling fluid.