Device for indirect production of cold for refrigerating machine

A heat transfer system for indirect cooling of a fluid medium comprising:

• a first, closed heat transfer circuit including:
• an evaporator unit in direct heat-exchange communication with a fluid medium to be cooled, said evaporator unit having an inlet and an outlet for the flow of refrigerant;
• a first condenser unit having an inlet and an outlet, the inlet of said first condenser unit being in fluid communication with the outlet of said evaporator unit;
• a first reservoir unit in direct fluid communication with the outlet of said first condenser unit for receiving liquid refrigerant from said first condenser unit, said first reservoir unit being in further fluid communication with the inlet of said evaporator unit for supplying refrigerant thereto;
• valve means interposed between said first reservoir unit and said evaporator unit for regulating the supply of refrigerant from said first reservoir unit to said evaporator unit;
• a second, closed heat transfer circuit including:
• a reactor unit incorporating a heat exchanger having an inlet and an outlet;
• a second condenser unit having an inlet in fluid communication with the outlet of the heat exchanger of said reactor unit and an outlet in fluid communication with the inlet of said heat exchanger;
• valve means interposed between the outlet of said second condenser unit and the inlet of said heat exchanger;
• a second reservoir unit encapsulating said first condenser unit, said second reservoir unit defining a liquid zone containing a liquid within which said first condenser unit is located and a vapor zone above said liquid zone;
• and
• a third condenser unit in fluid communication with the vapor zone of said second reservoir unit through a first pipeline and with the reactor unit through a second pipeline said third condenser unit being disposed above said second reservoir unit so that liquid formed in said third condenser unit falls back into said second reservoir unit and said third condenser unit being independent of said second condenser unit so that no heat is transferred between said second and third condenser units.