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Large Transcritical System typical transcritical system REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 12 In a typical large transcritical system the head pressure is controlled. shows a simplified circuit of such as system. 3 45 The diagram below 2 1. The compressor is a transcritical compressor, designed for the higher pressures and high cooling capacity of the refrigerant; 2. The gas cooler is similar in design to a conventional condenser, although pipe diameters might be smaller and it will need to withstand a higher pressure; 3. The gas cooler regulation valve is controlled by the pressure in the gas cooler and holds the pressure at the optimum setting (usually 90 bar g when the system is 1 transcritical, typically when the ambient temperature is above 21OC to 25OC); 4. The liquid receiver and associated liquid pipe work (shown in green) is at the intermediate pressure; 5. The receiver pressure regulating valve is controlled by the pressure in the receiver and controls the intermediate pressure to a level specified by the designer (usually in the range 35 to 65 bar g). For more detail about transcritical systems see the Danfoss and Emerson documents shown in the links. Danfoss ”Food Retail CO2 Refrigeration” Emerson Guide, “Introduction to R744 Systems “ Emerson Guide “R744 System Design”PDF Image | Alternative Refrigerants
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