Characteristics of R12, R22, R407C refrigerants in cold storage
[] I don’t know if you still remember the cold storage house I wrote some time ago how to choose the refrigerant for the cold storage design. Today the cold storage house will introduce several different cold storage refrigerants in detail, namely R12, R22, R407C
Characteristics of R12 refrigerant
R12 refrigerant (molecular formula CFC, code R12) is currently in the restricted use and phase-out list, but there are still a large number of small and medium-sized cold storage refrigeration equipment. In use, it is necessary to understand its characteristics
(1) R12 is a colorless and transparent liquid, non-toxic and non-irritating odor. At any concentration, the vapor is non-irritating to humans and respiratory system. When the concentration in the air exceeds 20%, people will feel uncomfortable, and when the concentration in the air exceeds 80%, it will cause breathing.
(2) R12 does not burn or explode. But when its elemental gas temperature reaches 400℃, it will produce toxic phosgene when exposed to an open flame
(3) Although R12 does not corrode metals, it is a strong detergent that can remove rust on the metal surface. The layer is cleaned down and the pipe is blocked.
(4)R12 has a corrosive effect on aluminum alloys containing 2% magnesium.
(5)R12 is a medium temperature and medium pressure refrigerant. Under standard atmospheric pressure, the boiling point is -29.8°C, and the freezing point is -15°C. When condensing with water, the condensing pressure is below 1.0 MPa; when condensing with air, the condensing pressure does not exceed 1.2 MPa.
(6)R12 has strong permeability, which can easily cause system leakage.
(7)R12 is corrosive to organic matter.
(8)R2 is insoluble in water and can be miscible with refrigerated lubricating oil in any ratio.
R22 refrigerant characteristics
R22 refrigerant (molecular formula CHF2Cl, code R2) is now the main refrigerant used in small and medium-sized cold storage refrigeration systems, and its characteristics are as follows:< /p>
R22 is colorless, odorless, non-flammable, non-explosive at room temperature. Under standard atmospheric pressure,
R22 has a boiling point of -40.8°C and a freezing point of -160°C.
R2 is a medium temperature and medium pressure refrigerant, with a condensation pressure of about 1.4MPa
The unit volume refrigeration capacity of R2 under air conditioning conditions is about 50% greater than R12.
R22 can partially dissolve with refrigerated lubricating oil, and can fully dissolve with refrigerated lubricating oil when the temperature is high; when the temperature is low, there will be stratification.
R22 is not miscible with water.
R22 does not corrode metals, and has strong corrosiveness and permeability to synthetic rubber and enameled wires.
R407C refrigerant characteristics
The chemical formula of R407C: CH2F2/CHF2CF3CF3CH2F, that is, R407C is made up of R32 refrigerant and R125 refrigerant plus R134a refrigerant. It is an environmentally friendly refrigerant that does not damage the oxygen layer. The boiling point is 43.9°C at a standard atmospheric pressure. Under normal temperature and pressure, RAO7C is a non-azeotropic mixture of fluoroalkane without chlorine. It is a colorless gas and can be easily compressed into a liquid state when stored in a steel cylinder.
The ODP of R10C is 0, and the GWP is 1,526. Because R407C has very similar characteristics and performance to R22, it is a long-term replacement of R22 refrigerant for the cold storage refrigeration system. R0C can be used in the original R2 system. There is no need to redesign the system, just replace a few parts of the original system, and replace the mineral refrigerating oil in the original system with a lubricating oil (POE oil) that is miscible with RA0C, and then it can be directly filled R407C, realize the environmental protection replacement of the original equipment. Since RA07C is a mixed non-azeotropic working fluid, in order to ensure that its mixed composition does not change, RAO7C must be charged in liquid form. If the refrigerant leaks in the R407C system and the performance of the system changes significantly, the remaining R407C in the system cannot be recovered For recycling, the remaining R407C refrigerant in the system must be emptied and refilled with new R407C refrigerant.
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