Which refrigerants should be added in gaseous state, and which refrigerants must be added in liquid state?

1. Principle of charging

1. Liquid charging

To charge liquid refrigerant is to turn the refrigerant cylinder upside down, because the cylinder is liquid refrigerant. After being inverted, the liquid refrigerant enters the refrigeration system through the filling pipe. Note: The fluorine discharge port of some steel cylinders will extend to the bottom of the cylinder. At this time, although the cylinder is upright, the liquid refrigerant is still added.

2, gaseous charging

Charging gaseous refrigerant means that the refrigerant cylinder stands upright; since the upper space of the cylinder is already gaseous refrigerant, Therefore, the gas refrigerant is added to the refrigeration system at this time.

Second, why do we need to add gas and liquid separately? Why do some refrigerants need to be added gas, and some should be added liquid?

1. Three concepts

Single refrigerant, non-azeotropic mixed refrigerant and azeotropic refrigerant

Single refrigerant: the refrigerant composition has only one refrigerant; for example: R22, R290; non-azeotropic refrigerant: a mixture of two or more different refrigerants in a certain proportion, it is in a saturated state, The composition of the gas and liquid phases is different; for example: r404a, r410a;

Azeotropic refrigerant: a mixture of two or more different refrigerants mixed in a certain ratio Boiling mixture, this type of refrigerant can maintain a certain evaporation temperature under a certain pressure, and its gas-liquid two phases always maintain the same composition ratio. For example: R500, R508A;

2, 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 simple working fluid, azeotrope and non-azeotrope?

Single working fluid, azeotropic refrigerants can be charged with gas; non-azeotropic refrigerants must be charged with liquid; but how do we distinguish between azeotropic and non-azeotropic refrigerants? It depends on the refrigerant model; according to the refrigerant naming rules:

Azeotropic refrigerant: the first number after R is '5Numbers in practical order. Such as: R500, R501, R502... R507

Non-azeotropic refrigerant: the numbering sequence of No. 400 after R is in order. Such as: R400, R401, R402,...R411

Four. Why do non-azeotropic refrigerants have to be in liquid form and why non-azeotropic refrigerants have to be in liquid form?

Let’s take a look at R410A refrigerant. Obviously, the refrigerant starting with '4' must be a non-azeotropic refrigerant with the following composition: R32 (difluoromethane) ：50%; R125 (pentafluoroethane): 50%;

Check the refrigerant physical properties table, we can see that the boiling points of R32 and R125 are different, which is why it is called non-community The reason for the boiling refrigerant: When the R410A refrigerant cylinder is left standing, the boiling point of R32 and R125 are different, which will inevitably lead to the vaporized gaseous refrigerant on the upper part of the refrigerant cylinder, and the composition is not 50%R32+50%R125 However, due to the low boiling point of R32, it is very likely that the upper part of the refrigerant is the component of R32. If gas refrigerant is added, the refrigerant added is not R410A, but R32. The reason why other non-azeotropic refrigerants can only be added in liquid is the same as above.

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