Capillary tube size, refrigerant, oil

[aabbcc]

Well I was trying to find this thread as I am new to this forum and lack of Positioning (LOL).

Well I have carefully read all the above and also the very interesting sites the pther memebrs posted about the formulas and cap diameters.

Well before 2 years I did set up a system with 5.5Hp compressor LOW and been able to set uo 14 pieces capillary tubes into one evaporator refrigerant R404A, which is really busting ba**s.

I can say I have read all the thermodynamics (even some times is Korean language LOL) Well anyway I can say from my little experience the formulas and adiabatics CAN ONLY give you a very small indication of what will the system needs.

Concerning the minimum of 4ft of length I disagree as there many set ups from domestic refrigerators to industrial refrigerators with more than 3.5meters or even 5meters of capillary...

Concerning the noise during cols days, well you should use a pressostat switch so it could stop the fan motors to turn when the LP is less 32Lbrs and start again at 42 ~ 45 Lbrs.... So in R22 the fluid would expand and would not have the noise and the same time more efficiency of the system...

Now the R134A with 5.5metres LENGTH and 1.3mm I can say with sure it is not a winner.

Let;s make it a little bit more difficult..

Well I would use a 1.mm cap size and about 3meters of length... But the capilarries would be 2 pieces...
Then you will have better boiling of fluid and enough quantity for the evaporator...
Cappilaries must be of the same size 2x3mmxΦ1.0mm

And lastly something that will help you...
Increasing Length of capilary = decreasing evaporation Temp and of course decreasing the LP.

Decreasing Length of Capilary = increasing the evaporation Temp and of course increasing the LP..

As the increasing and decreasing of the LP, there are many parameters you could twist, change or upgrade as the capilary will perform differently from 10C ~ 40C...

When working wih capilary MUST increase or decreas 10cm maximum of the length in each attempt to make the system to balance.

The MAIN TARGET is to have BALANCE in all the ambient Temperatures... It can be done and this is the magic of the capilary...

Just my 2cents.

[desA]

Well before 2 years I did set up a system with 5.5Hp compressor LOW and been able to set uo 14 pieces capillary tubes into one evaporator refrigerant R404A, which is really busting ba**s.

Wow. That must have been something to try & balance.

I can say I have read all the thermodynamics (even some times is Korean language LOL) Well anyway I can say from my little experience the formulas and adiabatics CAN ONLY give you a very small indication of what will the system needs.

Fair comment.

Concerning the minimum of 4ft of length I disagree as there many set ups from domestic refrigerators to industrial refrigerators with more than 3.5meters or even 5meters of capillary...

True. There are some at Cubigel, for R-134a, at 5.5m.

Concerning the noise during cols days, well you should use a pressostat switch so it could stop the fan motors to turn when the LP is less 32Lbrs and start again at 42 ~ 45 Lbrs.... So in R22 the fluid would expand and would not have the noise and the same time more efficiency of the system...

Interesting idea. If you turn off the evaporator fan, surely Te,sat will continue to drop lower? Perhaps stop at a certain value & then re-start if the system pulls down too low?

I've seen the evap fan turned off on a european specification heat-pump operating at low temperatures. Interesting.

Now the R134A with 5.5metres LENGTH and 1.3mm I can say with sure it is not a winner.

Let;s make it a little bit more difficult..

Well I would use a 1.mm cap size and about 3meters of length... But the capilarries would be 2 pieces...
Then you will have better boiling of fluid and enough quantity for the evaporator...
Cappilaries must be of the same size 2x3mxΦ1.0mm (corrected to suit later post)

This is interesting, indeed. Thanks for this. I have seen a few of these dual-capillary systems for R-134a fridges & even R-22 airconditioning systems.

And lastly something that will help you...
Increasing Length of capilary = decreasing evaporation Temp and of course decreasing the LP.

Decreasing Length of Capilary = increasing the evaporation Temp and of course increasing the LP..

Ok. Good points to remember. Thank you.

As the increasing and decreasing of the LP, there are many parameters you could twist, change or upgrade as the capilary will perform differently from 10C ~ 40C...

When working wih capilary MUST increase or decreas 10cm maximum of the length in each attempt to make the system to balance.

The MAIN TARGET is to have BALANCE in all the ambient Temperatures... It can be done and this is the magic of the capilary...

Just my 2cents.

Some excellent tips. Thanks you 'aabbcc'.