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REAL Alternatives Module 2 Design Differences for Alternative Refrigerants | 14 2.3 Secondary Systems R744 is also used as a secondary refrigerant, as shown below. 3 simple pumped secondary system 2 1 1. The R744 liquid pump is typically a centrifugal type, cooled by the liquid refrigerant. important that a constant supply of liquid enters the pump to prevent cavitation and a resultant deterioration in its reliability and performance; 2. R744 condenses in the 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. And its operation is generally controlled by the pressure in the R744 liquid receiver. R744 has advantages over other secondary fluids: Being volatile, it partially evaporates in the heat exchanger (evaporator), thus absorbing latent heat. This reduces the temperature difference across the heat exchanger; The high density of R744 means that less pump power is required. However, the R744 pressure will be significantly higher than for other secondary fluids. For example at a temperature of ‐3OC the pressure is approximately 30 bar g. It isPDF Image | Alternative Refrigerants
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