Vehicle refrigerating system with a heat exchanger, in which refrigerant is cooled by condensed water evaporation

The system has a compressor (12), a gas cooler (16), an expansion valve (20) and an evaporator (22) arranged in a coolant circuit (42). A heat exchanger (14) is arranged in the coolant circuit before the evaporator; heat is extracted from the coolant in the heat exchanger by evaporating water. Ambient air is fed to the heat exchanger after feeding water droplets fed into it via nozzles.