Capillary tubes

[nicolacozma]

I saw a question on this forum a while back and no one answered it. I've looked on google but dont get a definitive answer and i don't know.

To provide greater cooling capacity capillary tube restrictors;

a) should be shorter with a bigger bore
b) would increase flow automatically due to higher condensor pressure
c) should be long but with a bigger bore
d) should be connected directly to the evap inlet.

I would say either a or c...........

Ok i say "C" .

Is that right?

Increasing of cooling capacity is not related only with capillary tube modification. Greater cooling capacity means a greater flow rate of refrigerant through the compressor, and as a consequence the flow rate of the liquid through the capillary tube have to be greater.
Only a) solution can do this.

The c) solution wil give you, roughly, the same pressure drop across the capillary tube and this means the same flow rate of liquid.
If you increase the flow rate of liquid using a) method then you have to be carefull because you will have a wet compression with all the consequences.