Freezer

Abstract

The present invention relates to a freezer, comprising a cooled interior and comprising a wall that surrounds the cooled interior at least in regions, and comprising a refrigeration circuit, wherein the wall is formed at least in part by a vacuum insulation body and/or by an insulation body which comprises or is made of polyurethane, in particular comprises or is made of polyurethane foam, or only by a vacuum insulation body or only by an insulation body which comprises or is made of polyurethane, in particular comprises or is made of polyurethane foam, and in that the refrigeration circuit comprises a refrigerant mixture.

1 . A freezer comprising a cooled interior and comprising a wall that surrounds the cooled interior at least in regions, and comprising a refrigeration circuit, wherein the wall is formed at least in part by a vacuum insulation body and/or by an insulation body which comprises or is made of polyurethane, or only by a vacuum insulation body or only by an insulation body which comprises or is made of polyurethane, and in that the refrigeration circuit comprises a refrigerant mixture. 
     
     
         2 . The freezer according to  claim 1 , wherein that the wall forms part of a housing or carcass of the freezer. 
     
     
         3 . The freezer according to  claim 1 , wherein an inner and/or outer vacuum insulation panel is arranged on the wall. 
     
     
         4 . The freezer according to  claim 1 , wherein the the refrigeration circuit is configured to cool the cooled interior. 
     
     
         5 . The freezer according to  claim 1 , wherein the refrigeration circuit comprises a or exactly one condenser, compressor, precooler and evaporator, and one or exactly one expansion member. 
     
     
         6 . The freezer according to  claim 5 , wherein the compressor is configured to compress at a pressure ratio of less than or equal to 20. 
     
     
         7 . The freezer according to  claim 5 , wherein the precooler is a microstructure, plate, tube-in-tube, or multi tube-in-tube heat exchanger. 
     
     
         8 . The freezer according to  claim 1 , wherein the refrigeration circuit is a single-stage refrigeration circuit. 
     
     
         9 . The freezer according to  claim 1 , wherein the refrigerant mixture comprises two or more than two natural hydrocarbons or comprises a binary, tertiary, quaternary, refrigerant mixture of natural hydrocarbons. 
     
     
         10 . The freezer according to  claim 1 , wherein the refrigerant mixture further comprises nitrogen. 
     
     
         11 . The freezer according to  claim 1 , wherein the freezer is configured for storing vaccines, plasma and/or biological material. 
     
     
         12 . The freezer according to  claim 1 , wherein a temperature in the cooled interior is between −150° C. and −36° C. 
     
     
         13 . The freezer according to  claim 1 , wherein the freezer is a ULT device or is integrated in a fridge and/or refrigerator. 
     
     
         14 . The freezer according to  claim 5 , wherein the compressor is configured to compress at a pressure ratio of less than or equal to 15. 
     
     
         15 . The freezer according to  claim 5 , wherein the compressor is configured to compress at a pressure ratio of less than or equal to 10. 
     
     
         16 . The freezer according to  claim 5 , wherein the compressor is configured to compress at a pressure ratio of less than or equal to 9. 
     
     
         17 . The freezer according to  claim 1 , wherein the refrigerant mixture comprises a quaternary or higher-order (>4 component) refrigerant mixture comprising the natural hydrocarbons isobutane, propylene, ethylene and methane. 
     
     
         18 . The freezer according to  claim 1 , wherein a temperature in the cooled interior is between −150° C. and −90° C. 
     
     
         19 . The freezer according to  claim 1 , wherein a temperature in the cooled interior is between −90° C. and −36° C.