Test Results from the AHRI Low GWP AREP II (Alternative Refrigerant Evaluation Program) Transport Refrigeration

Transcription

1 Test Results from the AHRI Low GWP AREP II (Alternative Refrigerant Evaluation Program) Transport Refrigeration Soft Optimization Test of a R404A Alternative Refrigerant R452A (DR34) in a Trailer Refrigeration Unit.

2 Acknowledgements Thanks to the following companies for supplying the refrigerant samples tested: - Chemours To those who performed the work: - Michal Hegar - Michal Kolda - Vladimír Šulc - Prague Lab Team 2

3 Purpose & Some Evaluation Details Evaluate the soft optimized test results of next generation alternative refrigerant R452A in a R404A trailer refrigeration unit. Soft Optimization Changes - Adjustment of expansion device (1/4 turn open) - Refrigerant charge unchanged (4 kgs) Results are compared to the same trailer refrigeration unit running on R404A tested at same ambient temperature / box temperature / compressor speed conditions. 3

4 R452A Properties & Safety GWP 2140 (AR4) 1945 (AR5) Blend- ASHRAE Class A1: 11% R32/59% R125/30% R1234yf Temperature Glide = 4ºC (7.2ºF) vs. R404A = 0.8ºC (1.4ºF) Compressor Discharge Temperature = up 3.3ºC (6ºF) vs R404A R452A is a Close Property Match to R-404A 4

5 Test Setup Application: Trailer refrigeration unit sized for 15 meter European Trailer 5

6 Test Conditions - Unit run at high diesel engine speed mode (HS) and at electric stand-by (stand-by) mode under the temperature conditions shown below. Condenser Air Inlet Temperature (CAIT) Evaporator Air Inlet Temperature (EAIT) [ C] [ F] [ C] [ F] Note: AHRI condition AHRI condition Added condition ATP condition ATP condition 6

7 Test Results Cooling Capacity at 30.0 ºC (86ºF) Capacity Equal at Fresh & Frozen Conditions 7

8 Test Results Cooling Capacity at 37.8 ºC (100ºF) Capacity Close Match at Fresh Conditions Small Decreases at Frozen & Deep Frozen Conditions 8

9 Test Results COP at 30.0 ºC (86ºF) COP Basically the Same at Fresh & Frozen Conditions 9

10 Test Results COP at 37.8 ºC (100ºF) COP Basically the Same at Fresh & Frozen Conditions Small Decrease at Deep Frozen 10

11 Test Results Compressor Discharge Temperature at 30.0 ºC (86ºF) Discharge Temps as Predicted Up Max 3.3ºC (6ºF) 11

12 Test Results Compressor Discharge Temperature at 37.8 ºC (100ºF) Discharge Temps as Predicted Up Max 3.3ºC (6ºF) 12

13 Test Results Compressor Discharge Pressure at 30.0 ºC (86ºF) Discharge Pressures as Predicted 13

14 Test Results Compressor Discharge Pressure at 37.8 ºC (100ºF) Discharge Pressures as Predicted 14

15 Conclusions R452A (DR34) is comparable to R404A in capacity and efficiency at fresh conditions at both ambients with only small drops in capacity (-5.5% max) and efficiency (-3.3% max) were seen at the frozen and deep frozen conditions Compressor discharge temperatures and pressures were as predicted and acceptable for use in these types of products. Soft optimization consisted of; - Small expansion device adjustment to accommodate a minor change in mass flow rate (1/4 turn open). 15

16 Other R452A References KUJAK S.(*), BERGE J.(**), MAJURIN J.(*), KOLDA M., CROMBIE D. (*) Ingersoll Rand, United States, (**) Thermo King, United States, Assessment of Next Generation Refrigerant R452A to Replace R404A for Transport Refrigeration, ICR th IIR International Congress of Refrigeration. ZILIO C.(*), MANCIN S.(*), BROWN S. J.(**), LONGO G. A.(*) (*), New Refrigerant Options for R404A Replacement in Truck Refrigeration Systems, University of Padova, Department of Management and Engineering, Italy, (**) The Catholic University of America, School of Engineering, United States, ICR th IIR International Congress of Refrigeration. 16

17 Lubricant Compatibility Existing POEs found acceptable with the R452A Miscibility Solubility Viscosity Stability PVE s found to be chemical unstable with R452A New additives proposed to allow increased stability Existing POEs Found Compatible - Slightly Better Viscosity 17

18 R452A Chemical Stability & Materials Compatibility Good industry experience with R32 and R125 R1234yf knowledge base growing YF been found compatibility to HFCs Stability less than R- 134a, but acceptable Compatibility of Materials with R-452A Similar To R-404A 18

19 Field Trials & Experiences Marine Container Netherlands to Australia No issues Trailer have been shipped to date Issues Seen? ZERO! 19

20 Steve Kujak

21 APPENDIX 21

22 Test Setup Unit basic description: - Compressor: 4 cylinder reciprocating open shaft, 30 in 3 displacement - Lubricant: 35 cst, POE - Refrigeration system schematic diagram: 22

23 Test Setup, Cont. Monitored quantities: 23

24 Test Setup, Cont. Test chamber: Calorimeter cell with determined heat losses (gains) + measured heat input per ANSI/AHRI Standard 1110 Measurement uncertainty = ± 2 % (From ANSI/AHRI Standard 1110) 24