Compressor Calorimeter Test of R-404A Alternative

Compressor Calorimeter
Test of R-404A Alternative
Refrigerants ARM-31a,
D2Y-65, L-40, and R-32/R134a (50/50) in Medium
Temperature Refrigeration
Scroll Compressor
Som Shrestha
Omar Abdelaziz
January 16th, 2014
New York City
Overview
• Compressor Calorimeter
• Test Results
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RTDs
Temperature
± 0.4°F
Refrigerant mass flow
rate
Power and Energy
Compressor and
Meter
evaporator power
Refrigerant pressure,
Pressure Transmitter
high pressure side
Refrigerant pressure,
Pressure Transmitter
low pressure side
Mass Flow Sensor
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± 0.10%
± 0.5%
0.25% F.S. [750
psia]
0.25% F.S. [200
psia]
SC Glycol
Accuracy
Cond Glycol
Measured
Sub Cooler
Instrument
Condenser
T, P
Test Setup
Test Conditions
• Test condition:
 70°F to 140°F SDT in 10°F increments
 -10°F to 35°F SST in 5°F increments
 Either 20°F or 40°F superheat or 65°F suction temperature
 Cooling capacity normalized for 0°F subcooling
 Max discharge temperature 275°F
• Properties of refrigerants were calculated using REFPROP version 9.0
(Lemmon et al., 2010). Interaction parameters and “mixture” files
provided by the refrigerant manufacturers were used in REFPROP to
calculate properties of the alternative refrigerants (except for R-32/R134a mixture) tested.
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Manufacturer's Compressor
Performance Data
Evaporating (°F) / Condensing (°F)
20 / 120
Return Gas (°F) / Liquid to Expansion Valve (°F)
65 / 120
Capacity (Btu/hr)
23500
Power (Watts)
3320
Current (Amps)
15.6
EER (Btu/Wh)
7.1
Mass Flow (lbs/hr)
495
• The measured cooling capacity and EER were within ± 2.7% and ± 0.2%, respectively,
of the manufacturer’s data.
• Intermediate tests confirmed repeatability of cooling capacity within 0.45% and EER
within 0.5% at standard test conditions.
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Alternative Refrigerants Tested
Refrigerant
Components
R-404A
R-125 / R-143a / R-134a
44/52/4
3700
ARM-31a
R-32 / R-134a / R-1234yf
28/21/51
490*
D2Y-65
R-32 / R-1234yf
35/65
253*
L-40
R-32 / R-152a / R-1234yf /
R-1234ze(E)
40/10/20/30
302*
50.5/49.5
1040*
R-32/R-134a R-32 / R-134a
Mass Fraction, % GWP100
* Calculated based on GWP of pure refrigerants and their mass fraction in the blend
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Results
Deviation from baseline (R-404A)
Refrigerant
Test Condition
ARM-31a
Evap 20°F/ Cond
120°F
EER (%)
Capacity (%)
Discharge
Temperature (°F)
+9.7%
-5.6%
+24
-4.4% to +22.8%
-18.5% to +6.5%
+16 to +36
D2Y-65
Over the range
Evap 20°F/ Cond
120°F
+6.5%
+0.6%
+26
-4.2% to +14.6%
-11.0% to +9.7%
+18 to +36
L-40
Over the range
Evap 20°F/ Cond
120°F
+9.8%
-4.9%
+37
Over the range
Evap 20°F/ Cond
120°F
-5.4% to +24.7%
-20.0% to +8.9%
+25 to +53
+4.2%
+3.8%
+63
Over the range
-7.6% to +15.2%
-12.6% to +18%
+38 to +74
R-32 +
R-134a mixture
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Results
Saturation Discharge Temperature, °F
EER Ratio
Saturation Suction Temperature, °F
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Results
Saturation Discharge Temperature, °F
Capacity Ratio
Saturation Suction Temperature, °F
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Results
Saturation Discharge Temperature, °F
Discharge Temperature Difference, °F
Saturation Suction Temperature, °F
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Results
Saturation Discharge Temperature, °F
Discharge Temperature Difference, °F
Saturation Suction Temperature, °F
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Conclusions
• EER and cooling capacity for all four alternative
refrigerants are higher than that of R-404A at
higher SST SDT and lower at lower SST and
SDT
• Discharge temperatures of all the alternative
refrigerants were significantly higher than that of
R-404A at all the test conditions
Note: Complete test data and other details are
provided at the AHRI AREP 2013 as test report
number 21
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Acknowledgements
• Funding from DOE-BTO and Mr. Antonio Bouza, HVAC&R, and Water
Heating TDM at the U.S. DOE for his support
• Dr. Isaac Mahdereka, Mr. Vishaldeep Sharma, Randy Linkous, and
Brian Goins, for their support
• Dr. Xudong Wang from AHRI for his support
• Arkema, Daikin, Honeywell, and National Refrigerants for providing
lower-GWP alternative refrigerants to test
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References
• ANSI/AHRI 540-2004, Standard for Performance Rating of Positive
Displacement Refrigerant Compressors and Compressor Units
• ANSI/ASHRAE Standard 23.1-2010, Methods of Testing for Rating
the Performance of
• Lemmon, E.W. Huber, M.L., and McLinden, M. O., 2010, NIST
Standard Reference Database 23, NIST Reference Fluid
Thermodynamic and Transport Properties—REFPROP. Version 9.0
User's Guide, November 2010.
• Som Shrestha, Vishaldeep Sharma, Omar Abdelaziz, 2013.
“Compressor Calorimeter Test of R-404A Alternatives ARM-31a, D2Y65, L-40, and R-32/R-134a (50/50)”, TEST REPORT #21, AirConditioning, Heating, and Refrigeration Institute Low-GWP
Alternative Refrigerants Evaluation Program
http://www.ahrinet.org/App_Content/ahri/files/RESEARCH/AREP_Fin
al_Reports/AHRI%20Low-GWP%20AREP-Rpt-021.pdf
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Thank You!
Som Shrestha
[email protected]
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Appendix
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Results: EER Ratios
EER ARM‐31a / EER R‐404A
ARM-31a
1.30
Discharge Dew Point Temp (°F)
1.25
70
1.20
80
1.15
90
70
1.20
80
1.15
90
100
100
1.10
1.05
110
1.05
120
Discharge Dew Point Temp (°F)
1.25
1.10
1.00
EER D2Y‐65 / EER R‐404A
D2Y-65
1.30
110
120
1.00
130
0.95
140
130
0.95
140
0.90
0.90
‐10
‐5
0
5
10
15
20
25
30
‐10
35
‐5
0
EER L‐40 / EER R‐404A
L-40
1.30
5
10
15
20
25
30
35
Suction Dew Point Temperature, °F
Suction Dew Point Temperature, °F
Discharge Dew Point Temp (°F)
1.25
EER R32 + R‐134a mixture / EER R‐404A
R32 + R-134a
1.30
Discharge Dew Point Temp (°F)
1.25
70
1.20
80
1.15
70
1.20
80
90
1.15
1.10
100
1.10
100
1.05
110
1.05
110
120
1.00
130
0.95
140
0.90
90
120
1.00
130
0.95
140
0.90
‐10
‐5
0
5
10
15
20
25
Suction Dew Point Temperature, °F
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30
35
‐10
‐5
0
5
10
15
20
25
Suction Dew Point Temperature, °F
30
35