yngndrw
09-08-2008, 12:29 PM
Just a few questions and ideas for a project which I had. I remember that there used to be some formulas for cap tube sizes which used to work quite well. However as CPUs get more and more powerful, I think the formulas are needing an update.
I would like to build a test rig which will allow me to change the cap tube very easily to allow testing and graphing.
Here is the idea that I had:
http://www.xtremesystems.org/forums/attachment.php?attachmentid=84846&stc=1&d=1220902128
The setup allows the compressor to evacuate and isolate the cap tube, allowing changes to be made. The gas can also be stored in the storage tank allowing the charge to be adjusted without a manifold set. (If you had fixed guages installed - I'd probably just use my manifold set as the guages.)
Key:
1) Compressor.
2) Condenser.
3) High side access port.
4) High side refrigerant storage valve.
5) High side cap tube valve.
6) Refrigerant storage tank.
7) Cap tube under test. (Has flare connectors on each end.)
8) Low side refrigerant storage valve.
9) Cap tube purge / vacuum port
10) Low side access port.
11) Charging cap tube.
12) Low side cap tube valve.
13) Evaporator.
14) Filter drier. (As you can see from the numbering, I missed this from the diagram at first. :D)
Under operating conditions valves 4 and 8 would be closed and valves 5 and 12 would be open.
To evacuate the cap tube valves 5 and 8 would be closed and valves 4 and 12 would be open. refrigerant would be pushed into the storage tank. (6)
The compressor can then be shut off and valve 12 can be closed to isolate the cap tube. The cap tube would be disconnected from the flare at valve 5 and can be cut down. The cap tube can be purged via access port 9 if brazing is required for the change.
After modification to the cap tube, the flare at valve 5 is reattached and the cap tube is pressure tested and evacuated via external equipment via access port 9. The valves can then be returned to their operating setup and valve 8 can be opened slightly while running the system to add charge.
This setup required just a purging setup and an external vacuum pump. No recovery equipment is required for modifications of the cap tube to take place.
Any comments on this rig idea ?
An off topic question: If you are using a recovery machine, what happens to the liquid refrigerant in the recovery tank hose when you have finished and want to disconnect the tank ?
Sorry for the random symbols in the diagram, I'm not sure on the correct symbols.
Thanks,
-Andrew.
I would like to build a test rig which will allow me to change the cap tube very easily to allow testing and graphing.
Here is the idea that I had:
http://www.xtremesystems.org/forums/attachment.php?attachmentid=84846&stc=1&d=1220902128
The setup allows the compressor to evacuate and isolate the cap tube, allowing changes to be made. The gas can also be stored in the storage tank allowing the charge to be adjusted without a manifold set. (If you had fixed guages installed - I'd probably just use my manifold set as the guages.)
Key:
1) Compressor.
2) Condenser.
3) High side access port.
4) High side refrigerant storage valve.
5) High side cap tube valve.
6) Refrigerant storage tank.
7) Cap tube under test. (Has flare connectors on each end.)
8) Low side refrigerant storage valve.
9) Cap tube purge / vacuum port
10) Low side access port.
11) Charging cap tube.
12) Low side cap tube valve.
13) Evaporator.
14) Filter drier. (As you can see from the numbering, I missed this from the diagram at first. :D)
Under operating conditions valves 4 and 8 would be closed and valves 5 and 12 would be open.
To evacuate the cap tube valves 5 and 8 would be closed and valves 4 and 12 would be open. refrigerant would be pushed into the storage tank. (6)
The compressor can then be shut off and valve 12 can be closed to isolate the cap tube. The cap tube would be disconnected from the flare at valve 5 and can be cut down. The cap tube can be purged via access port 9 if brazing is required for the change.
After modification to the cap tube, the flare at valve 5 is reattached and the cap tube is pressure tested and evacuated via external equipment via access port 9. The valves can then be returned to their operating setup and valve 8 can be opened slightly while running the system to add charge.
This setup required just a purging setup and an external vacuum pump. No recovery equipment is required for modifications of the cap tube to take place.
Any comments on this rig idea ?
An off topic question: If you are using a recovery machine, what happens to the liquid refrigerant in the recovery tank hose when you have finished and want to disconnect the tank ?
Sorry for the random symbols in the diagram, I'm not sure on the correct symbols.
Thanks,
-Andrew.