Why AC cooling pipe is non insulated?

[shahxadakram]

I was wondering why AC cooling pipe is non insulated at this particular part.

I haven't any issue with this but technically it should be covered because when AC is running, this pipe is super cooled and in same place there's huge amount of heat from engine and radiator. Which would do effect the cooling, not much but it does. Any idea regarding this? What if it's totally covered like split AC in houses?

[xzap042]

Practically, it doesn't matter if you insulate it or not. The split ac pipes are insulated not for cooling but to prevent moisture on pipes, which is not a problem here.

[shabbir.1]

This the return pipe which feeds refrigerant to the compressor. It is kept uninsulated to ensure all the liquified refrigerant turns back into vapours state (after passing through the TxV or H-block metering device) before entering the compressor. Engine heat helps in changing physical state of the refrigerant.
To dig it further deep, metering devices in heat pumping systems are caliberated to maintain a certain degree of superheat, if they fail the compressor inlet can be fed with liquid state refrigerant thus resulting in a damage, since liquids are incompressible.

[shahxadakram]

Oh, it's return pipe, I didn't know this. But still, it's a bit confusing. According to you, it's to make ensure that if there's some liquid or compressed gas in the return pipe, the heat at this point will expand that before reaching again to the compressor to avoid any damage? If it's so then there's a huge energy loss. A compressor is already dealing with compressed or liquified gas, so damage isn't making sense. I'm not an expert just a curious learner. If you have any article regarding this please share here. I tried but couldn't find it.