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| C.S. AYRE S.A. ES: AIRE ACONDICIONADO Y REFRIGERACION, DISEÑO, MONTAJES, MANTENIMIENTOS, ASESORIA... |
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| HydroFluoroCarbon (HFC) Refrigerants |
| Refrigerant |
Formula |
Boiling temp.
ºC |
Condensing
pressure
(bar gauge)
30ºC
condensing temperature |
Operating
pressure
(bar)
at 40ºC |
C.O.P. |
cfm
per
1TR |
Critical
temp.
ºC |
Properties |
Applications |
| R11 |
C Cl3F |
23.8 |
0.24 |
9.1 |
5.0 |
36.5 |
198 |
Non flammable, non corrosive, non toxic, stable, faint odour. |
A low pressure refrigerant. Commercial plants with centrifugal compressors. |
| R12 |
C Cl2F2 |
-30.0 |
6.4 |
|
4.7 |
5.8 |
112 |
Little odour, colourless as gas or liquid, non flammable, non corrosive of ordinary metals, stable. |
Small plants with reciprocating compressors. Used in domestic & commercial refrigeration. Car air conditioning. |
| R22 |
CH Cl F2 |
-40.8 |
10.8 |
14.4 |
4.7 |
3.6 |
96 |
Little odour, colourless as gas or liquid, non toxic, non irritating, non flammable, non corrosive, stable. |
Packaged air-conditioning units where size of equipment and economy are important. |
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| HFC Refrigerant Properties |
| Refrigerant |
Operating pressure
(bar)
at 40ºC |
Boiling
Temp.
ºC |
Maximum
cycle
efficiency
(%) |
GWP
(100 yr) |
Properties |
Applications |
| R134a |
9.2 |
-26ºC |
83% |
1300 |
Non-toxic,
No
chlorine
content,
Non
ozone
depleting,
No
restrictions
on use |
Low pressures, high volume. Centrifugal and high speed screw compressors. Widely used as a refrigerant in centrifugal chillers and automobile air conditioning. Its low operating pressures make it particularly suitable for use in heat pumps. Good COP's. Advantages over R407C in service and maintenance procedures. |
R404A
R-125
143a
134a |
18.0 |
-46ºC |
75% |
3260 |
High pressures, low volume suits positive displacement compressors. Limited application range because of low critical temperature. Low efficiency restricts use. |
R407C
R-32
125
134a |
14.4 |
-44ºC |
80% |
1520 |
High pressures, low volume suits positive displacement compressors. High critical temperature allows wide application range. Used between 15kW to 250 kW in chillers and heat pumps. The specific heat of vaporisation and the volumetric characteristics are similar to R22, but the heat transfer performance is poorer during both evaporation and condensation. As a zeotrope, R407C exhibits a phenomenon known as ‘glide', that is changing state (evaporating or condensing) over a range of temperatures. Glide has an adverse effect on the performance of conventional, mixed flow, shell and tube heat exchangers. For best performance, R407C should be used in plant with counterflow plate heat exchangers. Glide can also increase the risk of freeze-up, in the event of a loss of flow or a localised restriction in the evaporator. |
R410A
50% R32
50% R125 |
23.0 |
-52ºC |
76% |
1720 |
Very high pressures suits positive displacement compressors. Low critical temperature. Small systems below 20 kW. Used in some split systems. Very high refrigeration effect and operating pressures that are approximately 50% higher than R22. Heat transfer performance is also better than that of R22, R134a and R407C. R410A has rapidly replaced R407C as the preferred refrigerant in split systems, mini chillers and some packaged units. |
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