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The HVACF to 125F (18C to 52C). A simple thermodynamic cycle model that matches average saturation temperatures in theevaporator and condenser along with a common compressor isentropic efficiency indicates that the capacity with DR-55 should be 2.5% lower than withR410A and should have an efficiency 1% higher. Actual performance with DR-55 matched the capacity of R410A at the same compressor speed (60Hz) with an efficiency 4% higher. Similarly positive results were obtained with DR-5A. With R32, the compressor speed needed to be reduced to 55 Hz(8.3%) to match the baseline capacity. Efficiency was 3% higher than baseline. As expected, R32 produced compressor discharge temperatures (CDTs)that were elevated by 20Fd (11Cd) and increased to 45Fd (25Cd) at the higher ambient conditions over R410A while DR-55 and DR-5ACDTs were only 10Fd (6Cd) above the baseline.

The results here demonstrate that DR-55 (R452B) and DR-5A (R454B) are "design compatible" alternatives to R410A. That is, they can be useddirectly in existing equipment designs with very little modification (other than those that might be needed to accommodate their "2L" mildly flammableclassification) while producing performance very similar to R410A.

Citation: 2016 Annual Conference, St. Louis, MO, Conference Papers

Product Details

Published: 2016 Number of Pages: 8Units of Measure:DualFile Size: 1 file , 1.3 MB Product Code(s): D-ST-16-C064