Alternatives to HCFCs in the Refrigeration and Air Conditioning Sector 71 S ection 02 Nr . crt E quipment Curr ent - R 22 Proposed – R 404A Result after retrofit 1 Evaporators – refrigerating rooms R ollerTo = -28oCDT = 8oCQo = 2,31KW R ollerTo = -28oCDT = 8oCQo = 2,36KW Q o R-404A = -2%..+2% 2 Evaporators – refrigeration cabinets Asim To =-32oCDT = 8oCQo = 3,20KW To = -32oCDT = 8oCQo = 3,17KW Q o R-404A = -2%..+2% 3 G roup of compressors 4 x Copeland Discus, D3DA4 – 500To = - 37oCTc = + 45oCT subcooling = 20oCT super heating = 20oCQo = 3,77KW/bucPel = 3,16KW/bucCOP = 1,19 4 x Copeland Discus, D3DA4 – 500To= - 37oCTc = + 45oCT subcooling = 20oCT superheating = 20oCQo = 5,03KW/bucPel = 3,78KW/bucCOP = 1,33 Q o grup R-404A = +33%Pel grup R-404A = +20% 4 Condensers 1 buc - 1 x 3 fansTc = + 45oCText = + 35oC 1 buc - 1 x 3 fansTc = + 45oCText = + 35oC Q c R-404A = -2% 5 R equired refrigeration power / circuit Qo required circuit = 14,74KW Qo required circuit = 14,74KW Q o required circuit /Qo grup R-404A = 14,74/20,65 = 71% 6 R equired condensing power / circuit Qc required circuit = 71% x 1.02 x 29,6KW = 21,55KW S afety factor (R-404A) = 21,08 / 21,55KW = 0.98% (-2%) 2.8.2 Result obtained for the freezing circuit (LTLT) C onclusions for the low temperature stage: Existing equipment parts are, from a mechanical point of view, functional with the R-404A refrigerant, under the condition of proper execution of the cleaning procedures, oil changes, filters, settings on the mechanical safety and control elements.