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An Encyclopedia on Refrigerant Gas Knowledge

Classification

Q Introduction of Refrigerant Gas R22

A Introduction of R22 gas

R22 is a member of the Freon family and belongs to the category of hydrochlorofluorocarbons. As the most widely used medium and low temperature refrigerant today, refrigerant R-22 is widely used in reciprocating compressors as a refrigerant in industrial, commercial, and household air conditioning systems.

It can also be used as aerosol spray for pesticides and spray paint, and it can also be used to produce fire extinguishing agent 1211; it is the basic raw material for the production of various fluorine-containing polymer compounds.

Physical Properties
Molecular Formula	CHCLF2
Molecular Weight	86.47
Boiling Point	101.3KPa(° C) -40.80
Freezing Point	101.3KPa (° C) -160.00
Density 30° C(kg/m3)	1174.2
Critical Temperature (° C)	96.2
Critical Pressure (MPa)	4.99
ODP	0.034
GWP	1700

The main purpose

As the most widely used medium and low temperature refrigerant today, R-22 is mainly used in household air conditioners, commercial air conditioners, central air conditioners, mobile air conditioners, heat pump water heaters, dehumidifiers, refrigerated dryers, cold storage, food freezing equipment, marine refrigeration equipment, Industrial refrigeration, commercial refrigeration, refrigeration condensing units, supermarket display cabinets and other refrigeration equipment.

Difluoromonochloromethane can also be used as a raw material for the production of polytetrafluoroethylene resin, an intermediate for fire extinguishing agent 1121, and as a physical foaming agent for polymers (plastics).

Used in reciprocating compressors, as refrigerants in industrial, commercial, and domestic air-conditioning systems; it can also be used as aerosol propellant for pesticides and spray paint, and it can also be used to produce fire extinguishing agent 1211; it is the production of various fluorine-containing polymers The basic raw material of the compound.

R22 belongs to the HCFC refrigerant. According to the Montreal Protocol, it will be completely phased out before 2030.

The main environmentally friendly alternatives: R404A, R410A, R290, R23, R407C, R411A, R417A, R1270.

Major international brands: DuPont, Honeywell, Arkema, Frioflor etc. However, because developed countries have already phased out R22 ahead of schedule, the production of this product is no longer allowed in their own countries, so the so-called imported R22 sold on the market is actually domestic OEM production.

It is generally used in air conditioners or a two-machine cascaded first stage, as the high-temperature end refrigerant, which has greater refrigeration strength than general refrigerants.

Quality Index
Purity	more than 99.93%
Water content	≤0.001%
Acidity	≤0.00001%
Evaporation residue	≤0.01%
Appearance	Colorless and clear
Odor	Odorless

Refrigerant R22 packaging

Disposable steel bottle packaging:
1. 13.6kg/bottle, 22.7kg/bottle;
2. reusable steel bottle packaging (recycling and packaging steel bottles): 400kg/bottle, 800kg/bottle.

Refrigerant R22 storage and transportation

Refrigerant R22 cylinders are pressurized containers. They should be stored away from fire, heat, and direct sunlight. They are usually stored in a cool, dry and ventilated warehouse; they should be loaded and unloaded with care to prevent damage to the cylinders, valves and other accessories.

What refrigeration oil matches refrigerant R22?

The refrigerating oils usually used with refrigerant R22 are: Suniso 3GS, 4GS, 5GS, KunLun 3GS, 4GS, 5GS, ICEMATIC SW220, CP-4214-320, LUNARIA KT15, 22, 32, 46, 56, Capella WF68, etc.; What kind of refrigerating oil is finally used in different equipment and different application places should follow the recommendations of the refrigeration compressor and refrigeration (air-conditioning) equipment manufacturers, or determine the use of the same design and technical requirements according to the specific conditions of the refrigeration compressor and refrigeration equipment.

Q Introduction of Refrigerant Gas R134A

A Introduction

R134a (1,1,1,2-tetrafluoroethane) is one of the most widely used medium and low temperature environmentally friendly refrigerants. It has good comprehensive performance, making it a very effective and safe R12 (dichloro two Fluoromethane) can be used in most fields where R12 refrigerant is used.

R-134a (1,1,1,2-tetrafluoroethane) is a kind of non-chlorine atom, does not damage the ozone layer, and has good safety performance (non-flammable, non-explosive, non-toxic, non-irritating, non-corrosive) refrigerant, its cooling capacity and efficiency are very close to R-12 (dichlorodifluoromethane, freon), so it is regarded as an excellent long-term alternative refrigerant. R-134a is currently internationally recognized as the best environmentally friendly substitute for R-12. It does not destroy the ozone layer at all. It is an environmentally friendly refrigerant recognized and recommended by most countries in the world. It is also the current mainstream environmentally friendly refrigerant. It is widely used in the initial installation and maintenance of new refrigeration and air-conditioning equipment. [1] . R134a has very low toxicity and is non-flammable in the air. The safety category is A1, which is a very safe refrigerant.

Physical Properties
Molecular Formula	CH2FCF3
Molecular Weight	102.03
Boiling Point	-26.1
Freezing Point	101.3KPa (° C) -96.60
Density 30° C(kg/m3)	1188.1
Critical Temperature (° C)	101.1
Critical Pressure (MPa)	4.06
ODP	0
GWP	1300

Main Application

R-134a is the most widely used medium and low temperature environmental protection refrigerant. Due to the good comprehensive performance of R-134a, It is a very effective and safe alternative to R-12, which is mainly used in most fields where R12 refrigerant is used, including: refrigerators, freezers, water dispensers, automobile air conditioners, central air conditioners, dehumidifiers, cold storage, commercial refrigeration, It can also be used in refrigeration equipment such as ice water machine, ice cream machine, freezing and condensing unit, etc., and can also be used in aerosol propellants, medical aerosols, insecticide propellants, polymer (plastic) physical foaming agents, and magnesium alloy protection Gas etc. R-134a can be widely used as a refrigerant in automobile air conditioners, refrigerators, central air conditioners, commercial refrigeration and other industries, and can be used in medicine, pesticides, cosmetics, and cleaning industries.

Quality Index
Purity	≥99.90%
Water content	≤0.001%
Acidity	≤0.00001%
Evaporation residue	≤0.01%
Chloride content	N/M
Appearance	Colorless and clear
Odor	Odorless

Q Introduction of Propane Refrigerant Gas R290

Basic Information of R290 Propane Gas

R290 is a new type of environmentally friendly refrigerant, mainly used in central air conditioners, heat pump air conditioners, household air conditioners and other small refrigeration equipment. R290 (propane), also known as propane, has excellent thermal performance, low price, and R290 is compatible with ordinary lubricating oil and mechanical structural materials, ODP=0, GWP is small, does not need to be synthesized, and does not change the content of natural hydrocarbons , Has no direct impact on the greenhouse effect. Propane has a large refrigeration capacity per unit volume, which is very suitable for small rotary compressors. The main physical properties of propane are very similar to R22. The R22 system can be used. The original machine and production line are not modified, and propane can be filled directly, which is a direct substitute. Considering the cost of CFC replacement, propane is particularly suitable for developing countries.

　　 Currently, R290 has been used in domestic heat pump water heaters and air conditioning systems in Germany. Wolf Laborato-ries Limited has produced R290 household refrigerators. DANFOSS is also developing R290 household refrigerators.

Physical properties of R290

　　 At -25℃, the pressure of R 290 is similar to that of R22, which is higher than R1 34a and lower than R404A. The standard boiling point of R290 is similar to R22, and the critical temperature is also close to R22, but the exhaust temperature of R290 is lower than that of R22. Therefore, the pressure of R290 is lower than R22. In other words, the suction temperature of R290 can be higher and the evaporation temperature can be lower. some. At 45°C condensing temperature, 32°C suction temperature and no subcooling, the volumetric cooling capacity of R290 is similar to that of R22, which is 1.5 times that of R134a. It is 2.5 to 3 times that of R600a, which means that for household refrigerators with the same cooling capacity, the R290 refrigerator refrigeration system has a smaller structural size, and the overall space occupied by the refrigerator is reduced.

Physical Properties
Molecular Formula	CH₃CH₂CH₃
Molecular Weight	44.1
Boiling Point ℃	-42.1
Freezing Point	N/M
Critical Temperature (℃)	96.6
Critical Pressure (MPa)	4.248
ODP	0
GWP	3.3

The safety performance of R290

The disadvantage of using R290 as a refrigerant is the flammability of R290. The compressor, condenser, evaporator, pipeline and other components of the refrigeration system may cause the leakage of working fluid, and the temperature controller, compressor relay, lighting, etc. Electronic components such as defrost buttons can be sources of ignition. Therefore, the maximum charge of R290 in the refrigerator should be controlled at about 150g. In order to ensure safe operation, the refrigeration system and control components should be arranged in different spaces. Install a protector and flame-retardant relay on the compressor. Control ventilation to avoid local concentration accumulation, and often use gas sensors to detect leaks. The R290 refrigeration system should be closed, and leak detection should be strictly carried out before charging the refrigerant.

R290 refrigeration system performance

The theoretical COP values of R290, R600a and R134a are higher than those of R22 at the evaporating temperature of -25°C and the condensing temperature of 45°C, without subcooling and high superheat; the theoretical COP values of JR290, R600a and R134a at low superheat Lower than R22. The COP values of R290 and R134a are similar. Just like R134a, R404A and R600a, the superheat of the suction is very important to the performance of the R290 refrigeration system, which can improve the COP of the refrigeration system, while R22 has little effect. For the R290 refrigerator refrigeration system, because R290 has a high specific heat of hot steam, it can have a superheat temperature of 20°C to 32°C, which can increase the COP of the 290 refrigerator.

Quality Index
Purity	≥ 99.90%
Sulfur content ppm by weight	less than 1.0
Water content ppm by weight	less than 10
Acidity ppm by weight	less than 1.0
Evaporation residue	≤ 0.01%
Appearance	Colorless and clear
Odor	Odorless

Conclusion

　　 R290 (propane) has excellent thermal performance, low price, large refrigeration capacity per unit volume, small size, physical properties very similar to R22, and it is a direct substitute. Taking corresponding safety protection measures has a good application prospect for environmental protection and energy saving.

Q Introduction of ISOBUTHANE Refrigerant Gas R600a

1. Introduction to R600a

R600a refrigerant: alias R600a, Chinese name isobutane, English name isobutane, trade name Reflube 600a

Application: refrigerant;

Chemical formula: C4H10;

Type: Hydrocarbon refrigerant;

2. Application of R600a

It is mainly used to replace R12 and R134a refrigerants in refrigerators, freezers, and other small refrigeration equipment; because R600a is flammable, it is usually only used in low-temperature refrigeration equipment with a small amount of liquid. It is also often used as a mixed refrigerant. Two components; R600a is compatible with traditional lubricants;

High-purity isobutane is mainly used as standard gas and the preparation of special standard mixed gas;

Used in the synthesis of isooctane, as a gasoline octane improver, used in the production of isobutylene, propylene, methacrylic acid, and used as a refrigerant.

3. Physical Properties of R600a

Physical Properties
Molecular Formula	(CH₃)₂CHCH₃
Molecular Weight	58.123
Boiling Point ℃	-11.7
Freezing Point	N/M
Density 30° C(kg/m3)	221
Critical Temperature (℃)	134.9
Critical Pressure (MPa)	3.648
ODP	0
GWP	3

4. Quality Index of R600a

Quality Index
Purity	≥ 99.90%
Sulfur content ppm by weight	less than 1.0
Water content ppm by weight	less than 10
Acidity ppm by weight	less than 1.0
Evaporation residue	≤ 0.01%
Appearance	Colorless and clear
Odor	Odorless

5. R600a refrigerant packaging (for reference only)

Disposable steel bottle packaging: 6.5kg/bottle, 11.5kg/bottle

Reusable steel bottle packaging (recycled packaging steel bottle): 60kg/118L, 200kg/400L, 400kg/800L,470kg/926L

6. R600a refrigerant storage and transportation

(1) R600a storage

R600a refrigerant cylinders are pressure vessels. They should be stored away from fire, heat sources, and direct sunlight. They are usually stored in a cool, dry and ventilated warehouse;

R600a is stored separately from oxidants, combustibles or combustibles, and aluminum. Remember to store them together.

The storage area should be equipped with leakage emergency treatment equipment

Pay attention to the product name and the date of acceptance during acceptance, and use advanced warehouses first;

(2) R600a transportation

You must wear the safety helmet on the cylinder when transporting the cylinder. Place the steel cylinders horizontally with the mouth of the cylinder facing the same direction. Do not store them crosswise;

Please load and unload lightly during transportation to prevent damage to accessories such as cylinders and valves.

In summer, it should be transported in the morning and evening to prevent sun exposure and away from heat sources;

It is forbidden to drop off during railway and road transportation;

Do not mix with oxidizers, combustibles or combustibles, active metals, etc.;

Q Introduction of Refrigerant Gas R410a

A Basic Introduction of R410a Refrigerant Gas：

R410A: It is a new type of environmentally friendly refrigerant, does not destroy the ozone layer, the working pressure is about 1.6 times that of ordinary R22 air conditioners, and the cooling (heating) efficiency is high. R410A new refrigerant is composed of two quasi-azeotropic mixtures R32 and R125 each with 50%, mainly composed of hydrogen, fluorine and carbon elements (expressed as hfc), which is stable, non-toxic, and superior in performance. At the same time, since it does not contain chlorine, it will not react with ozone, that is, it will not destroy the ozone layer. In addition, the performance of air conditioners using new refrigerants will also be improved. R410A was once recognized internationally as the most suitable refrigerant to replace R22, and it has been popularized in Europe, America, Japan and other countries. R410A replaces the global trends in major international markets and the outlook for its use and the dynamics of entering the international market.

Physical Properties

R410A, is a kind of mixed refrigerant, it is a mixture composed of 50% R32 (difluoromethane) and 50% R125 (pentafluoroethane). Its advantage is that it can be used according to specific requirements, for various properties, such as Taking flammability, capacity, exhaust temperature and efficiency into consideration, a refrigerant is tailored.
R410A is colorless, non-turbid, volatile, boiling point -51.6℃, freezing point -155℃; its main characteristics are:

(1) Does not destroy the ozone layer. Its molecular formula does not contain chlorine, so its ozone depletion potential (ODP) is 0. The global warming factor (GWP) is 2025.

(2) Very low toxicity. The allowable concentration is 1000 ppm as R22.

(3) Non-flammable. The flammable polarity in the air is zero.

(4) High chemical and thermal stability

(5) The water solubility is almost the same as R22.

(6) It is a mixed refrigerant, composed of two refrigerants

(7) It is not compatible with mineral oil or alkylbenzene oil. (Compatible with POE[ester lubricant] and PVE[ether lubricant])

Physical Properties
Molecular Weight	72.58
Boiling Point	101.3KPa(° C) -51.6
Freezing Point	N/M
Density 30° C(kg/m3)	1038
Critical Temperature (° C)	72.5
Critical Pressure (MPa)	4.95
ODP	0
GWP	2000

Future Prospect of R410a

As people's awareness of environmental protection increases, people have higher and higher requirements for product environmental protection. Compressor refrigerants range from R12, R22, R134a, R407C to R410A, and people’s efforts to environmental protection have not changed. R410A is not the end of the development of environmentally friendly refrigerants but a new starting point. R410A does not harm the ozone layer, but has a higher greenhouse effect (GWP is 1730). People have begun to start with the greenhouse effect again, and introduced more environmentally friendly and efficient refrigerant compressors. R32 has a higher greenhouse effect (GWP is 670) and R290 (GWP is 3.3).

Quality Index
Purity	≥99.90%
Water content	≤0.001%
Acidity	≤0.00001%
Evaporation residue	≤0.01%
Chloride content	≤0.0001%
Appearance	Colorless and clear
Odor	Odorless

Q Introduction of Refrigerant Gas R404a

Basic Introduction of Refrigerant Gas R404a

R404A is a mixture of HFC125, HFC-134a and HFC-143. The ratio is R404A = 44% R125 + 4% R134A + 52% 143A. It is a colorless gas at room temperature, and a colorless and transparent liquid under its own pressure. R-404A is suitable for new commercial refrigeration equipment, transportation refrigeration equipment or renewal equipment at medium and low temperatures. Closest to R-502, this refrigerant is suitable for all environments where R-502 can operate normally.

Product name: R404A (R-404A)

Product Category: HFC

Chemical composition: pentafluoroethane/trifluoroethane/tetrafluoroethane mixture

Refrigerant R404A, alias R404A, product names include SUVA HP62, SUVA 404A, Genetron 404A, etc. As R404A belongs to the HFC-type non-azeotropic environmentally friendly refrigerant (completely does not contain ozone-depleting CFC, HCFC), it is currently recognized and recommended by most countries in the world as the mainstream low-temperature environmentally friendly refrigerant. Re-added during installation and maintenance. It complies with the standards of the US environmental protection organization EPA, SNAP and UL, and complies with the A1 safety level category of the American Society of Heating, Refrigeration and Air-Conditioning Engineers (ASHRAE) (this is the highest level and harmless to humans).

Physical Properties

Physical Properties
Molecular Formula	CHF2CF3/CF3CH2F/CH3CF3
Molecular Weight	97.6
Boiling Point	101.3KPa(° C) -46.60
Freezing Point
Density 30°C(kg/m3)	1017.2
Critical Temperature (°C)	72.1
Critical Pressure (MPa)	3.74
ODP	0
GWP	3800

Quality Index

Quality Index
Purity	≥99.90%
Water content	≤0.001%
Acidity	≤0.00001%
Evaporation residue	≤0.01%
Chloride content	N/M
Appearance	Colorless and clear
Odor	Odorless

Application of R404a Refrigerant

As a widely used medium and low temperature refrigerant today, R404A is often used in cold storage, food freezing equipment, marine refrigeration equipment, industrial low temperature refrigeration, commercial low temperature refrigeration, transportation refrigeration equipment (refrigerated trucks, etc.), refrigerated condensing units, supermarket display cabinets Wait for refrigeration equipment.

Refrigerant R404A is the most common industry standard refrigerant (usually low temperature refrigeration system) to replace Freon R22 and R502 in newly installed refrigeration equipment. R404A is the closest to the operation of R-502, and it is suitable for all R-502 that can operate normally. Environment, R404A is recognized and used by most refrigeration equipment manufacturers in the world. However, because R404A is different from R502 and R22 in physical and chemical properties, theoretical cycle performance, and compressor oil, the after-sales maintenance of refrigeration equipment initially installed as R502 and R22 refrigerants, if you need to add or replace refrigerants, still Only R502 and R22 can be added, usually R404A cannot be used to replace R502 and R22 directly (that is, exchange-type replacement is usually not possible).

Q Introduction of Refrigerant Gas R407c

A Basic Introduction of Refrigernat Gas R407c

R407c is a mixture of R32 refrigerant and R125/refrigerant plus R134a refrigerant in a certain proportion. It is an environmentally friendly refrigerant that does not destroy the ozone layer.

R407C has very similar characteristics and performance to R22, so it has become a long-term alternative to R22 and is used in various air conditioning systems and non-centrifugal refrigeration systems.

R407C can be used in the original R22 system without redesigning the system. It only needs to 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 R407C, and then it can be directly filled R407C, realize the environmental protection replacement of the original equipment.

Since R407C is a mixed non-azeotropic working fluid, in order to ensure that its mixed composition does not change, R407C must be filled in a liquid state. If refrigerant leakage occurs in the R407C system and the performance of the system changes significantly, the remaining R407C in the system cannot be recycled and reused. The remaining R407C refrigerant in the system must be emptied and recharged with new R407C refrigerant.

Physical Properties

Physical Properties
Molecular Formula	CH2F2 CF3CHF2 CH2FCF3
Molecular Weight	86.2
Boiling Point	-43
Freezing Point	not determinded
Critical Temperature (° C)	86.74
Critical Pressure (MPa)	4.619
ODP	0
GWP	1700

Quality Index

Quality Index
Purity	≥99.90%
Water content	≤0.001%
Acidity	≤0.00001%
Evaporation residue	≤0.01%
Chloride content	N/M
Appearance	Colorless and clear
Odor	Odorless

Application of Refrigerant Gas R407c

R407C is a ternary non-azeotropic refrigerant introduced as a substitute for R22. In actual replacement, you only need to replace the lubricating oil, change its dryer and other minor parts. In order to improve the easy decomposition of ester oil into residues, additives are often added to the system. When in use, in order to give full play to its advantages, it is best to choose a counterflow heat exchanger. In addition, the area of the condenser and the flow rate of the cooling medium also increase. R407c also has the characteristics of cleanliness, low toxicity, non-combustibility, and good cooling effect, and is widely used in the air conditioning industry.

Q Introduction of Refrigerant Gas R32

Basic Introduction

Difluoromethane is an organic substance with a molecular formula of CH2F2 and a molecular weight of 52.02. It is a colorless gas and is partially miscible with water.

Used as a dry engraving agent, a substitute for low-temperature refrigerant R-502, or as a mixed refrigerant with HFC-134a and HFC-152a to replace HCFC-22

Chinese name Difluoromethane

CAS NO. 75-10-5

Chinese alias HFC-32

English name difluoromethane

English alias R-32

Molecular formula CH2F2

Molecular weight 52.02

CAS Number: 75-10-5

MDL number: MFCD00039283

EINECS number: 200-839-4

RTECS number: PA8537500

Physical Properties of R32 Gas

Physical property:
molecular formula	CH2F2
molecular weight	52.02
melting point,℃	-136
density(25℃) liquid, g/cm³	0.96
critical temperature,℃	78.52
critical density ,g/cm³	0.43
water solubility℃,W%	0.44
ODP	0
GWP	675

Quality Index of R32 Gas

Quality index
purity,%	above 99.93%
moisture,%	≤0.001
acidity,%	≤0.0001
evaporated residue,%	≤ 0.01
chloride (cl-)experiment	test permition
noncondensable gas(v/v),%	1.5
appearance	colorless transparent liquefied gas

Application of R32 Gas

Difluoromethane is a coolant with zero ozone depletion potential. Difluoromethane and pentafluoroethane can form a constant boiling mixture (called R-410A), which can be used as a substitute for chlorofluorocarbons (also known as Freon) in new coolant systems, mainly to replace HCFC-22 , As a compound medium and low temperature mixed refrigerant. Although it has zero ozone depletion potential, it has a high global warming potential, and its potential is 550 times that of carbon dioxide on a 100-year basis.

Q Introduction to R1234yf Refrigerant Gas

A
R1234yf (Chemical name: 2,3,3,3-Tetrafluoropropene) is a hydrofluoroolefin (HFO) refrigerant developed as an environmentally friendly alternative to R134a in automotive air conditioning (AC) systems and other refrigeration applications.

Key Properties of R1234yf

Chemical Formula: CF₃CF=CH₂

Global Warming Potential (GWP): <1 (extremely low compared to R134a, which has a GWP of 1,430)

Ozone Depletion Potential (ODP): 0 (does not harm the ozone layer)

Flammability: Mildly flammable (classified as A2L – low burning velocity)

Boiling Point: -29.4°C (-20.9°F) at atmospheric pressure

Applications: Primarily used in automotive air conditioning, but also in some commercial refrigeration systems

Advantages of R1234yf

✅ Eco-friendly: Significantly lower GWP than R134a, complying with EU MAC Directive (EU 517/2014) and other global regulations.

✅ Energy Efficiency: Similar cooling performance to R134a, making it a drop-in replacement in many systems (with minor modifications).

✅ Future-Proof: Adopted by major car manufacturers (e.g., BMW, Mercedes, GM, Ford) due to regulatory bans on high-GWP refrigerants.

Disadvantages & Challenges

⚠ Mild Flammability: Unlike R134a (non-flammable), R1234yf is classified as A2L (low flammability), requiring updated safety standards.

⚠ Higher Cost: More expensive than R134a due to production complexity and patents.

⚠ Compatibility Issues: Not all R134a systems can directly switch to R1234yf without modifications.

Regulatory Status

EU F-Gas Regulation: Phasing out high-GWP refrigerants, making R1234yf the standard for new vehicles.

U.S. EPA SNAP Program: Approved for use in new light-duty vehicles.

Other Regions: Increasing adoption in Japan, China, and other markets pushing for low-GWP refrigerants.

Conclusion

R1234yf is a sustainable, low-GWP refrigerant designed to replace R134a, particularly in automotive AC systems. While it offers environmental benefits, its mild flammability and cost require careful handling and system adaptations. As global regulations tighten, R1234yf is expected to remain a key refrigerant in the transition to greener cooling solutions.

Q Introduction to R422D Refrigerant

R422D is a hydrofluorocarbon (HFC) refrigerant blend designed as a replacement for R-22, a widely used but ozone-depleting hydrochlorofluorocarbon (HCFC) refrigerant. R422D is part of a group of retrofit refrigerants developed to comply with environmental regulations, such as the Montreal Protocol and the U.S. EPA’s SNAP (Significant New Alternatives Policy) program, which aim to phase out ozone-depleting substances.

Composition of R422D

R422D is a zeotropic (non-azeotropic) blend consisting of three components:

R-125 (44.7%) – A non-ozone-depleting HFC with good thermodynamic properties.

R-134a (52.0%) – A widely used HFC refrigerant with low toxicity and good stability.

R-600a (Isobutane) (3.3%) – A hydrocarbon added to improve oil return and system performance.

Key Properties of R422D

ASHRAE Safety Classification: A1 (non-toxic, non-flammable)

Boiling Point: Approximately -43.5°C (-46.3°F) at atmospheric pressure

Global Warming Potential (GWP): ~1923 (lower than some other R-22 alternatives like R-407C but still high compared to newer refrigerants)

Ozone Depletion Potential (ODP): 0 (no ozone depletion effect)

Operating Pressure: Slightly higher than R-22 but lower than some other alternatives (e.g., R-410A)

Applications of R422D

R422D is primarily used in retrofit applications for existing R-22 systems, including:

Commercial refrigeration (supermarkets, cold storage, walk-in coolers)

Air conditioning systems (especially older units not designed for newer refrigerants)

Heat pumps (with proper system adjustments)

Advantages of R422D

Drop-in Replacement for R-22 – Can often be used without major system modifications, though performance may vary.

No Ozone Depletion – Unlike R-22, it does not contribute to ozone layer damage.

Compatibility with Mineral Oil (MO) and Alkyl Benzene (AB) Lubricants – Unlike some other alternatives, R422D does not always require a switch to POE (polyolester) oil.

Lower Discharge Temperatures – Reduces compressor stress compared to some other retrofit refrigerants.

Disadvantages & Challenges

Lower Efficiency – R422D can lead to reduced cooling capacity (5-15% less than R-22) and higher energy consumption in some systems.

Glide Effect (~5°F) – Being a zeotropic blend, it has a temperature glide, which can affect heat exchanger performance if not properly managed.

High GWP – While better than some alternatives, its GWP is still significant, making it less favorable under newer regulations (e.g., F-Gas regulations in the EU).

Potential for Fractionation – Due to its blend nature, leaks can alter composition, requiring proper handling and recharge procedures.

Comparison with Other R-22 Replacements

Refrigerant	Type	GWP	Oil Compatibility	Capacity vs. R-22	Notes
R422D	HFC Blend	~1923	MO/AB/POE	Slightly Lower	Drop-in, moderate glide
R407C	HFC Blend	~1774	POE Required	Lower (~10-15%)	Higher glide, needs TXV
R404A	HFC Blend	~3922	POE Required	Higher	Not ideal for AC, high GWP
R290 (Propane)	Natural HC	3	MO/AB	Similar	Flammable, low GWP
R410A	HFC Blend	~2088	POE Required	Much Higher	Not a direct R-22 replacement

Retrofit Guidelines for R422D

Oil Compatibility: Works with mineral oil in many cases, but POE oil may improve performance.

Charging: Must be charged as a liquid to maintain blend composition.

Leak Checks: Critical due to potential fractionation.

Expansion Valve Adjustment: May be needed to optimize performance due to glide.

Environmental & Regulatory Status

Accepted under SNAP (U.S. EPA) for certain applications.

Being phased out in some regions (e.g., EU F-Gas Regulation) due to high GWP.

Not a long-term solution but a transitional option for R-22 phase-out.

Conclusion

R422D is a practical short- to medium-term retrofit refrigerant for R-22 systems, offering ease of use and moderate environmental impact. However, its lower efficiency and high GWP make it less sustainable compared to newer alternatives like R-454B or natural refrigerants (e.g., R-290, CO₂). System performance should be evaluated before conversion, and long-term transitions to lower-GWP refrigerants should be considered.

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Q Introduction of Refrigerant Gas R22

Q Introduction of Refrigerant Gas R134A

Q Introduction of Propane Refrigerant Gas R290

Q Introduction of ISOBUTHANE Refrigerant Gas R600a

Q Introduction of Refrigerant Gas R410a

Q Introduction of Refrigerant Gas R404a

Q Introduction of Refrigerant Gas R407c

Q Introduction of Refrigerant Gas R32

Q Introduction to R1234yf Refrigerant Gas

Q Introduction to R422D Refrigerant

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