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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 16 2.5 Cooling Capacity As shown in Module 1 the cooling capacity of R744 is several times that of more commonly used refrigerants. This has an impact on: Compressor design – less displacement is required relative to the motor size, so compressors specifically for R744 are used; Pipe sizing – the pipe diameter is less; Heat exchangers – smaller evaporators and condensers can be used to See REAL Alternatives Guide 1 “Introduction” Emerson Guide “R744 System Design” achieve the same temperature difference (TD). If the condenser and evaporator sizes are not reduced the TD will be lower and the system capacity and efficiency will be improved. Do not confuse cooling capacity with efficiency. The cooling capacity is the amount of heat that will be absorbed by the refrigerant in the evaporator. The cooling capacity is high compared to other refrigerants, the efficiency is similar. Motor Motor R404A compressor R744 compressors Both compressors provide same cooling capacity and use approximately the same power.PDF Image | Alternative Refrigerants
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