After R22 was banned, new refrigerants came onto the market, including R134a and R404A. Despite higher investment costs, REWE Group relies on the climate-friendly R134a in many areas, as its greenhouse potential amounts to 1,300 in comparison to 3,784 for R404A. In addition, industry and commerce also need to implement other more climate-friendly refrigerants. That is why REWE Group tested CO2 in the deep freezing systems.
The advantages speak for themselves: only CO2 refrigerants do not reduce the ozone layer, have a negligible greenhouse effect, are chemically inactive, non-inflammable and non-toxic. Furthermore, CO2 is inexpensive and does not have to be recovered and disposed of. This is coupled with its outstanding cooling performance, which is five to eight times that of R22. In the case of positive test results, the company considers to convert the deep freezing sections of further stores to CO2. REWE Group also uses the climate-friendlier ammonia for freezing for large-scale refrigeration systems in its central warehouses. The less climate-damaging refrigerants propane and butane are also used as a standard in around 10,000 deep freezers at REWE and PENY stores, 8,500 of which are in Germany.