Classification Method of Refrigerant

Classification Method of Refrigerant


The refrigerant is the working substance in the refrigeration system, there are many types, and the actual use is also different. This article will specifically introduce the classification of refrigerants.

the classification method of refrigerant

Refrigerant is also called refrigeration working fluid, which is the working substance in the refrigeration system. At present, there are more than 80 types of refrigerants, and we can distinguish them through different conditions, which helps us better understand the nature and uses of refrigerants. The following is the classification method of refrigerant.

Evaporation temperature

According to the evaporating temperature of the refrigerant under the standard atmospheric pressure (100kPa), it can be divided into the high-temperature refrigerant, medium-temperature refrigerant, and low-temperature refrigerant.

High-temperature refrigerants (or low-pressure refrigerants), such as R113, R114, and R21, are often used in air-conditioning systems for centrifugal chillers.

Medium temperature refrigerants (or medium pressure refrigerants), such as R22, R717, R142, R502, are commonly used in ordinary single-stage compression and two-stage compression piston refrigeration compressors.

Low-temperature refrigerants (or high-pressure refrigerants), such as R503, alkanes, and olefins, are often used in the low-temperature stage of cascade refrigeration devices.

Chemical components

(1) Inorganic compounds

The first number after the R in the code name of the inorganic compound refrigerant is 7, and the number following it is the integer part of the molecular weight.

(2) Halides of saturated hydrocarbons (refrigerant freon)

The code name of Freon is composed of the letter R, followed by the numbers (m-1)(n+1)(x)B(z). When m=1, (m-1) can be omitted; if z=0, B(z) can be omitted.

(3) Hydrocarbons

Saturated hydrocarbons are also written in accordance with the numbering rules of Freon, except for butane, written as R600. In addition, allotropes add a letter "a" after the code name, such as isobutane as R600a.

Unsaturated hydrocarbons and their halogen derivatives. Write a "1" after the R, and then write the number according to the Freon numbering rules.

(4) Azeotropic refrigerant

The numbering standard of azeotropic refrigerants stipulates that the first digit after R is 5, and the following two digits are numbered in the practical order, such as R500, R501, etc.

(5) Non-azeotropic refrigerant

Non-azeotropic refrigerants stipulate that the first digit after R is 4, and the following two digits are numbered in the practical order, such as R400, R401, R407A, R407B, R407C, etc.

Safety level

The safety of refrigerants mainly refers to the toxicity, flammability, and explosiveness of refrigerants. The safety grades of refrigerants are represented by A, B, C plus 1, 2, 3, A1 is the safest, and C3 is the most dangerous.

Substances with safety level C (C1, C2, C3) generally cannot be used as refrigerants.

The safety levels of common refrigerants are as follows:

Class A1: R11, R12, R22, R23, R124, R125, R134a, R410a, R500, R502, R718, R744

Type A2: R32, R142b, R143a, R152a

Class A3: R290, R600a

Category B1: R123

Category B2: R717 (ammonia)

If we want to make better use of refrigerants, we must understand their properties and uses in detail so that the refrigeration system can achieve the desired effect. If you want to know more about refrigerants after reading the above, you can contact us for more detailed solutions.

As a professional manufacturer of refrigerants and fluoropolymers, we have an experienced manufacturing team and leading R&D technology. We have a professional production department and strict quality inspection system to provide customers with high-quality and safe products. We produce and export products in strict accordance with the standards, and at the same time can provide customers with thoughtful one-stop service. If you are interested in our refrigerants, please contact us immediately!