Why some refrigerants must be added in liquid form, so the analysis is much easier to remember

Is the R22 refrigerant gas or liquid? Is R410A refrigerant gas or liquid? Many times these questions will be asked. Today, the editor has compiled relevant materials for you, so that you can thoroughly understand why some refrigerants must be added in liquid form. Let’s take a look at the principle of charging refrigerant first:

1, charging principle

a, liquid charging

Because the generally used steel cylinder contains liquid refrigerant, after the cylinder is inverted, the liquid refrigerant enters the refrigeration system through the filling pipe. However, the fluorine discharge port of some cylinders will extend to the bottom of the cylinder. At this time, although the cylinder is upright, the liquid refrigerant is still added.

b. Gaseous charging

Charging gaseous refrigerant means that the refrigerant cylinder is standing upright; because the upper space of the cylinder is already gaseous Refrigerant, so what is added to the refrigeration system at this time is the gaseous refrigerant.

2. Why do we need to add gas and liquid separately

a, three concepts

Single refrigerant, non-common refrigerant Boiling mixed refrigerant and azeotropic refrigerant; single refrigerant: refrigerant composition has only one refrigerant; for example: R22, R290;

non-azeotropic refrigerant: two or more different refrigerants A refrigerant mixed in a certain proportion. In the saturated state, the composition of the gas and liquid phases is different; for example: r404a, r410a;

Azeotropic refrigerant: There are two or more different refrigerations It is an azeotropic mixture formed by mixing the refrigerant in a certain ratio. This type of refrigerant can maintain a certain evaporation temperature under a certain pressure, and its gas-liquid two-phase always keeps the composition ratio unchanged. For example: R500, R508A;

b, liquid or gas?

1) Regardless of whether the refrigerant is gaseous or liquid, the composition inside will not change, so the gaseous state can be charged when the refrigerant is charged.

2) Although the composition of the azeotropic refrigerant is different, because the boiling point is the same, the composition of the gas and liquid is also the same, so it can be filled with gas;

3), Non-azeotropic refrigerants have different boiling points, so liquid refrigerants and gaseous refrigerants are actually different in composition. If you add gas at this time, it will inevitably lead to different refrigerant components, such as only a certain gaseous state. Refrigerant, so only liquid can be added.

3. How to distinguish simplex, azeotrope and non-azeotrope?

a. Simplex, azeotropic refrigerants can be charged with gas; non-azeotropic refrigerants must be charged with liquid;

b, azeotropic refrigerants are in the standard It is stipulated that the first digit after R is '5Such as: R500, R501, R502... R507

c. Non-azeotropic refrigerants: Non-azeotropic refrigerants have not been numbered in the refrigerant numbering standard, but the number 400 behind R is reserved. The numbering sequence is for supplementary numbering. Such as: R400, R401, R402,...R411

Do you understand? In a word, if the refrigerant at the beginning of 'R4' needs to be charged, please add liquid! !

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