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    Evaluation of the possibilities of substituting potent greenhouse gases (HFCs, PFCs
    and SF6)
    Enclosure 1: 
    Comparison of indirect and direct refrigeration used in medium-sized refrigeration
    systems (50 kW). The simulation model shows a large integrated refrigeration system with
    relatively high charg and leakage rate (50 kg of R404A and 10% per year).