MackFri® - 04a
MackFri® - 04a
ASHRAE Name R-404a
(44% HFC-125 / 4% HFC-134a / 52% HFC-143a)
The Blend for replacement of R-502 and R-22.
MackFri®-04a refrigerant. It is a near-zeotrope blend R125/R143a/R134a with mass proportion of the components 44/52/4. Temperature glide is less than 0,5 К. Basic physical qualities of MackFri®-04a are given in the table down.
Depending on the operation conditions, 4...5% increase of cold-productivity and up to 8% discharge temperature reduction compared to analogous characteristics of R502 are ensured.
After having been introduced for sale since the end of 1993 г., R404A has been first used in the new equipment designed for low and average boiling points. At present, R404A is used as an alternative to R502 at retrofit of the systems. At that it is necessary to substitute mineral oil for polyester one and a filter-dehydrator.
Changing of composition of the blend (MackFri®-04a) circulating in the refrigeration system can cause impairment of its energy performance, especially in the patterns with a receiver or in case of considerable length of communication lines.
MackFri®-04a component is R143a, which being pure becomes combustible at pressure 1*105 Pа and temperature 177 oС, and mixed with the air - at volume fraction 60 %. At low temperatures in order to reach combustibility high pressures are required. Therefore, you shouldn't mix MackFri®-04a with the air or use and allow high air concentrations with a pressure being higher than atmospheric or at high temperatures.
Packing: 10.9 Kg. (24 lb.) Net nonrefillable Steel cylinders and individual neutral carton outside.
- Acceptable Substitutes for Class I (CFCs) Substances in Commercial Refrigeration under the Significant New Alternatives Policy (SNAP) Program printed on December 18, 2000 as:
 a) replacement for CFC-502 in the Cold Storage Warehouses (R, N)
b) replacement for CFC-502 in the Ref. Transport (R, N)
c) replacement for CFC-502 in the Retail Food Ref. (R, N)
d) replacement for CFC-502 in the Ice Machines (R, N)
e) replacement for CFC-502 in the Vending Machines (R, N)
- Acceptable Substitutes for Class I (CFCs) Substances in Non-Commercial Refrigeration under the Significant New Alternatives Policy (SNAP) Program printed on December 18, 2000 as:
a) replacement for CFC-502 in the Industrial Process Refrigeration (R, N)
b) replacement for CFC-502 in the Household Freezers (R, N)
(R) = Retrofit Uses
(N) = New Uses
Similar: SUVA HP62, FX70, Genetron 404a, Forane 404a, Solkane 404a
Physical properties:
| Parameter |
|
| Molecular mass, gm/mole |
97,6 |
| Boiling point at atmospheric pressure, oС |
-46,7 |
| Critical temperature, oС |
72,7 |
| Critical pressure, кPа (abs.) |
3735 |
| Liquid critical density, kg/m3 |
485,1 |
Density at 25 oС, kg/m3:
of liquid
of saturated vapors |
1048
18,04 |
| Liquid specific heating capacity at 25 oС, кJoule/(kg*К) |
1,502 |
| Vapor specific heating capacity at 25 oС and atmospheric pressure, кJoule/(kg*К) |
0,871 |
| Pressure of saturated liquid vapors at 25 oС, кPа (abs.) |
1257 |
| Heat of vaporization at normal boiling point, кJoule/kg |
198,7 |
| Liquid coefficient of thermal conductivity at 25 oС, Wt/(m*К) |
7,46 х 10-2 |
| Vapor coefficient of thermal conductivity at 25 oС and atmospheric pressure, Wt/(m*К) |
1,2 х 10-2 |
| Water resolvability in the refrigerant at 25 oС, mas.% |
- |
| Inflammability level in the air (0,1 МPа), vol.% |
No |
| Ozone depletion potential ODP |
0,0 |
| Global warming potential GWP |
0,94 |
| Tolerance concentration at inhale (TC), mln-1 |
1000 |
|
|
