Emergency liquid nitrogen refrigeration system and method for data center

The invention belongs to the technical field of data center refrigeration, and discloses a data center emergency liquid nitrogen refrigeration system and method, and the data center emergency liquid nitrogen refrigeration system comprises a liquid nitrogen heat exchange device and a condensate water pre-cooling device; the liquid nitrogen heat exchange device comprises a liquid nitrogen tank, an outlet pipeline, a first heat exchanger, an inlet pipeline and a compressor; the condensate water precooling device comprises a condensate water collector, a water level alarm, a water pump, a condensate water outlet pipeline, a second heat exchanger and a condensate water return pipeline; the condensate water collector is connected with the first heat exchanger through a condensate water collecting pipe, and a condensate water outlet pipeline and a condensate water return pipeline on the condensate water collector are connected with the second heat exchanger. When the refrigerating system of the data center breaks do