R123 has been used successfully as a low ODP replacement for R11 since the ban on R11’s production after December 31, 1995, imposed by the MontrealProtocol. However, the Montreal Protocol ban on use of R123 after December 31, 2019, in developed countries is imminent. The azeotropic blend of74.7%wt Z-1,1,1,4,4,4-hexafluorobut-2-ene (R1336mzz(Z)) and 25.3%wt E-1,2-dichloroethene (R1130(E)) recently received the designation ofR514A in ASHRAE Standard 34. This paper will provide a description of the environmental and thermodynamic characteristics of R514A as areplacement for R123. The GWP of R514A is 7 by AR4 and 2 by AR5. The ODP of R1130(E) is a de minimus 0.00024, similar to the recentlyintroduced R1233zd(E). The thermodynamic properties of R514A result in performance that is comparable to R123. R514A’s pressures are 4% to6% lower than with R123 across the range of typical chiller operation. For a fixed displacement compressor, the capacity produced with R514A is expectedto be about 5% to 6% lower than with R123. For centrifugal compressor-based chillers, R514A’s larger work coefficient requires about a 5% increasein impeller diameter or speed to achieve the same lift as R123. The thermodynamic efficiency of R514A is within 0.5% of R123. The performance oftwo centrifugal compressor-based chillers was measured in laboratory tests with R123 as a baseline and with R514A as a replacement. Overall performancein terms of capacities and efficiencies met expectations. The heat transfer performance of R514A in the evaporators and condensers was observed to becomparable to R123. R514A is found to be a design-compatible replacement for R123 in both engineered conversion applications and in new production.
Citation: 2017 Winter Conference, Las Vegas, NV, Conference Papers
Product Details
- Published:
- 2017
- Number of Pages:
- 8
- Units of Measure:
- Dual
- File Size:
- 1 file , 1 MB
- Product Code(s):
- D-LV-17-C085
