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    Evaluation of the possibilities of substituting potent greenhouse gases (HFCs, PFCs
    and SF6)
    Enclosure 2: 
    Comparison between a direct system using R404A and an indirect system using
    propane. The refrigeration capacity of the system is 10 kW and has a refrigerant charge of
    5 kg and a leakage rate of 10 % per year.