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2 REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 13 2.2 Subcritical cascade systems R744 is also used in cascade systems, as shown below. 3 Simple cascade system 1. The compressor for R744 is typically similar to that for R410A (it will usually operate at similar pressures); 2. R744 condenses in the cascade heat exchanger, rejecting its heat to the evaporating high stage refrigerant; 3. The high stage system is usually a simple chiller type system, operating using HFC, HC or R717. The high stage can also use R744, in which case it will be transcritical for some of the time. The operation of the high stage is generally controlled by the pressure in the R744 liquid receiver. Further information about cascade systems is provided in the documents shown in the links. Danfoss “Cascade CO2 System” Emerson Guide “Introduction to R744 Systems “ Emerson Guide “R744 System Design” 1PDF Image | Alternative Refrigerants
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