(57) The invention relates to a cascade refrigerating system comprising a primary refrigerating
system (4) operating with a first refrigerant, which primary refrigerating system
(4) comprises compressor means, connected to condensing means, where the primary refrigerating
system (4) further comprises heat exchanging means (2), where heat is exchanged from
a secondary refrigerating system, which secondary refrigerating system comprises pumping
means arranged to supply refrigerant to evaporating means (40) and the secondary refrigerating
system comprises at least two pumping vessels (20,22) connected through respective
check valves (12,14,28,30) which pumping vessels (20,22) are connected to at least
one heat exchanger (67), in which refrigerant is evaporated to generate high pressure,
which high pressure is led to the top of one of the pumping vessels (20,22) for supplying
refrigerant with high pressure towards the evaporation means (40). The purpose of
the invention is to provide an energy efficient refrigerating system that is suitable
for refrigerant circulation with reduced energy consumption for circulating refrigerant
in refrigerating systems.
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