Is the refrigerant gas or liquid

Is the refrigerant gas or liquid

Regarding whether to charge the refrigerant, whether it is gas or liquid, many masters must have known for a long time. I often see people inquiring about this refrigerant when charging, is it gas or liquid? Here is a summary. For your reference.

　　1, three concepts

Single working fluid refrigerant, non-azeotropic mixed refrigerant and azeotropic refrigerant, single working fluid refrigerant: the refrigerant composition has only one working fluid; non-azeotropic refrigerant: two or more different refrigerants are mixed in a certain ratio The composition of the gas-liquid phase is different in the saturated state. Azeotropic refrigerant: azeotropic mixture formed by mixing two or more different refrigerants in a certain proportion. This type of refrigerant It can maintain a certain evaporation temperature under pressure, and its gas-liquid two-phase always keeps the composition ratio unchanged.

　　2, liquid or gas?

　　1) No matter whether the single working substance refrigerant is gas or liquid, its composition will not change, so gas can be charged when charging refrigerant.

　　 2) Although the composition of the azeotropic refrigerant is not the same, 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) Due to the different boiling points of non-azeotropic refrigerants, the actual composition of liquid refrigerant and gaseous refrigerant is different. At this time, if gas is added, the composition of the added refrigerant will inevitably be different, such as only added A certain gaseous refrigerant, so only liquid can be added.

　　3, why can't all add liquid

Many friends who saw this, muttered in their hearts, since it is so difficult to distinguish, I don’t care what refrigerant is to add liquid to ensure that the composition is the same? Wrong, big mistake; we all know that in general, refrigerant charge Finally, it is necessary to add after the equipment is turned on, and add from the compressor suction port

　　Go in; if you add a liquid refrigerant, it is equivalent to the liquid refrigerant entering the suction port of the compressor, which will obviously cause the liquid shock of the compressor; damage the compressor.

　 4. Summarize common refrigerant liquid or gas state

　　 Having said so much, many friends can't stand it. Here is a direct summary of whether common refrigerants are added in liquid or gaseous state, for reference when repairing.

　　1), gas-filled refrigerant: R13, R134a, R22, R23, R290, R32, R500, R600a

　　2), add liquid refrigerant: R401A, R410A, R410B, R407C, R404A;

　　 So many refrigerants, I believe my friends can't remember it clearly. One sentence tells you the secret: as long as the refrigerants at the beginning of R4* are added in liquid form, the rest are added in gaseous form.