MackFri^® - 07c

MackFri^® - 07c
ASHRAE Name : R407c
(23% HFC-32 / 25% HFC-125 / 52% HFC-134a)
The Blends for replacement of HCFC's.

MackFri^®-07c refrigerant. As an alternative to R22 refrigerant, company "MackDown" has developed, for using in the air-conditioning systems, MackFri^®-07c refrigerant, whose values of boiling and condensation pressures are close to the corresponding values of R22.
MackFri^®-07c refrigerant is a zeotrope blend of R32/R125/R134a (mass proportions of the components, correspondingly, 23/25/52%). First, the refrigerant of the following composition has been created: 30/10/60 %. Later, with the aim of fire risk reduction mass proportions of the components have been changed: 23/25/52% (MackFri^®-07c); 20/40/40% (MackFri^®-07a); 10/70/20% (MackFri^®-07b).
Main advantage is that when changing from R22 to R407C, there are not required considerable alterations in the refrigeration system. At present R407C is considered as an optimal alternative of R22 according to cold-productivity and pressure of saturated vapors.
On the market of refrigerants MackFri^®-07c is widely introduced and it is bought in those cases when it is necessary to substitute R22 in the operating equipment (with insignificant alterations) or to select a refrigerant instead of R22 for the new equipment.
At the same time the majority of companies are concerned with big temperature glide Dt_gl = 5...7 К, peculiar for R407C, therefore, mass proportions of the components of suggested blends are varied within a wide range. This drawback considerably impedes servicing of refrigeration systems. Thus, in the systems with several evaporators breakdown of the initial concentration of the actuating fluid charged into the system is possible. Analogous difficulties occur also in the refrigeration systems with the flooded evaporator.
While using MackFri^®-07c it is not required to insert any alterations into the refrigeration facility design - it is only needed to substitute refrigeration oil for polyester one, as well as elastomers, absorbents of filters-dehydrators and safety valves. Polyester oils compatible with MackFri^®-07c are extremely hygroscopic. It makes strict demands to the assembly technology of a refrigeration machine. Moreover, MackFri^®-07c is peculiar for very low ( 25...30 % lower than for R22) values of of the coefficient of heat transfer; that's why, heat-exchange apparatus operating on MackFri^®-07c, appear to be more metal-intensive.
Leakages out of the refrigeration system will cause changing of the refrigerant composition and its resolvability in the refrigeration oil, and it will effect energy effectiveness and heat- transfer conditions in the evaporator and condenser. Changing of the refrigerant composition in the process of operation will make regulation more difficult and will complicate the procedure of topping-up. Absence of control of the oil concentration in the evaporator can affect the effectiveness of heat-transfer processes occurring there. Thus, presence of 0.2% of polyester oil in the actuating fluid is reducing the coefficient of heat transfer of R407C by 2 %. With 2 % of oil in the refrigerant, coefficient of heat transfer is reducing by 14 %.
Characteristics of MackFri^®-07c are given in the table down.

Packing:13.2 Kg. (29 lb.) Net nonrefillable Steel cylinders and individual neutral carton outside.

- Acceptable Substitutes for Class II (HCFCs) Substances in Air Conditioning and Refrigeration under the Significant New Alternatives Policy (SNAP) Program as of December 18, 2000
a) replacement for HCFC's in the Household and Light Commercial AC (R, N)
b) replacement for HCFC's in the Commercial Comfort Air Conditioning (R, N)
c) replacement for HCFC's in the Industrial Process Refrigeration (R, N)
d) replacement for HCFC's in the Industrial Process Air Conditioning (R, N)
f) replacement for HCFC's in the Cold Storage Warehouse Systems (R, N)
g) replacement for HCFC's in the Ice scating Rinks (R, N)
i) replacement for HCFC's in the Refrigerated Transport (R, N)
j) replacement for HCFC's in the Retail Food Refrigeration (R, N)
k) replacement for HCFC's in the Ice Machines (R, N)
l) replacement for HCFC's in the Household and other Refrigerated Appliances (R, N)

(R) = Retrofit Uses
(N) = New Uses

Similar : Klea 66, SUVA 9000, Genetron 407c, Forane 407c, Solkane 407c

Physical properties:

Parametr   Molecular mass, gm/mole 86,2 Boiling point at 1,0325-105 Па, 0C -43,56 Freezing point, 0C -- Thermal critical point, 0C 86,7 Critical pressure, 105Pa 46 Critical density, kg/m3 506,8 Liquid density at 25 0С, kg/m3 1136 Heat of vaporization at boiling point, kilojoule/kg 246,1 Saturated vapor density at -25 0C, kg/m3 11,14 Vapor pressure at 25 0C, 105 Pa 1,185 Limiting inflammability in the air, % of the volume No Self-ignition temperature, 0C 733 Ozone depletion potential ODP 0 Global warming potential HGPW 0,38 Global warming potential for 100 years GWP 1600 Maximum allowable concentration on a working place, ppm 1000