Technical Note: Comparing R407C and R410A
Table of Contents
Purpose pag. 3
1. R407C and R410Apag. 3
2. R407C and R410A Comparative Data
pag. 3
3. Advantages and Disadvantages of the R407C and R410A
pag. 4
3.1 R407Cpag. 4
3.2 R410Apag. 4
Conclusionpag. 4
2
Purpose
The purpose of this document is to provide a brief overview of refrigerants R410A and R407C;
describing their characteristics and comparing their environmental impact, regulatory compliance,
and resulting system efficiency.
1. R407C and R410A
The R407C is a non-ozone depleting blend of three HFC refrigerants (R32 wt 23%, R125 wt 25% and
R134A wt 52%), designed to closely match R22 pressure and performance to allow for a smooth
transition from R22 to R407C. Although this transition is suggested, the R407C’s performance
characteristics are similar to that of the R22.
The R410A is a non-ozone depleting blend of two HFC refrigerants (R32 wt 50% and R125 wt 50%),
designed to provide benefits in efficiency and system size by increasing system pressure and taking
advantage of thermodynamic and transport properties. Clearly, the R410A exhibits higher pressures
and refrigeration capacity than the R407C.
The properties and performance of the R407C and R410A are compared in Table 1.
2. R407C and R410A Comparative Data
Properties/Performance
R407C
R410A
Ozone Depletion Potential (ODP)
(CFC11=1.0)
0
0
Global Warming Potential (GWP)
(CO2=1.0 [100 yr integrated time
horizon])
1600
1725
Total Equivalent Warming Impact
(TEWI)a
-16%a
Maximum Allowable Concentration
in the Workplace
Flammable
Toxicity
1000 ppm
1000 ppm
No
No
Very Low
Very Low
+1 to +5 %a
Relative Energy Efficiency Ratio (EER)a
+90 to +135 psia
Change in Discharge Pressurea
Table 1. Properties and Performance of the R407C and R410A.
a
Compared to R407C.
Source: DuPont Fluorochemicals
3
3. Advantages and Disadvantages of the R407C and R410A
3.1 R407C
Advantages
• Exhibits thermo-physical properties that are similar to the R22, thus, when changing from the R22
to the R407C, minimal alterations in the refrigeration system are required. An R22 system and an
R407C system use many of the same components.
Disadvantages
• Multiple significant leaks (50 wt. %), and recharges may, in some cases, cause the refrigerant
composition to change. This could have a minor impact on energy efficiency and heat transfer
conditions.
3.2 R410A
Advantages
• The global warming potential value of the R410A is higher compared to the R407C, but the TEWI
is lower.
• Characteristics of the R410A permit the use of a smaller displacement compressor with a smaller
coil area and lower refrigerant charge, while maintaining system efficiencies comparable to R407C
equipment.
Disadvantages
• Operating pressures are higher than the R407C, which requires thicker walled tubing, high
pressure compressors, and the use of components capable of withstanding these high pressures.
An R407C and an R410A system use none of the same components, thus, the R407C system must
be completely redesigned in order to use the R410A.
Conclusion
While the R407C and R410A offer almost equivalent capacity and performance characteristics, the
R410A has a lower TEWI than the R407C. Both have the same A1 designation in the ASHRAE1 Standard
34: Designation and Safety Classification of Refrigerants. While both refrigerants are widely available,
R410A is currently being used extensively for most new air cooled systems.
1
The American Society of Heating, Refrigerating and Air Conditioning Engineers establishing guidelines relating to HVAC systems.
4
Sources
■
■
DuPont Fluorochemicals
ASHRAE, The American Society of Heating, Refrigerating and Air Conditioning Engineers establishing guidelines relating to HVAC systems.
Glossary
■
EER: Relative Energy Efficiency Ratio
■
GWP: Global Warming Potential
■
ODP: Ozone Depletion Potential
■
ppm: parts-per-million
■
psi: pound per square inch
■
TEWI: Total Equivalent Warming Impact
5
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