2 stage cascade

**herefishy** · 05-14-2005, 03:25 AM

Originally Posted by _HL4E_HalfLife_

That seems a bit small for a compressor of this size and valve port openings (10mm across). Are you sure the model and serial numbers are the same? Im still looking for some technical specs such as rpm's,run cap mfd,Start cap mfd,relays,etc.

Increasing the valve port size will decrease volemtric efficiancy (capacity) of the compression cycle due to re-expansion of compressed gas in the compression chamber.

I will refer to my Copeland Electrical data book for the electrical components for you. Even though the compressor model is not listed in the compressor search section of the Copeland website (because the model number has been superceded, I'm sure), You would likely find the model number and information in the Copeland Electrical Handbook.

Regards,

**Chris_F** · 05-14-2005, 11:36 AM

If you want real power I'd look for a good scroll compressor instead of a semi-hermetic one.

**_HL4E_HalfLife_** · 05-14-2005, 05:25 PM

Originally Posted by Chris_F

If you want real power I'd look for a good scroll compressor instead of a semi-hermetic one.

The only scroll's i've seen around here are like 3ton and up thats too big!!. other than that I can pretty much get any compressor up to 1.5hp for free.

altho this compressor was made in 1987 it has never been used so its just as good as if it was built yesterday.

**_HL4E_HalfLife_** · 05-14-2005, 06:30 PM

I just had a thought, does anyone know if you can use Acetylene as a refrigerant? I never heard of anyone using this gas before as a refrigerant but as u know most gases can be used as a refrigerant gases.

Acetylene properties here:

http://www.c-f-c.com/specgas_products/acetylene.htm

It also has a very low boiling point seen here:

http://www.c-f-c.com/charts/alkynes.htm

**kayl** · 05-14-2005, 06:44 PM

no cant use acetylene as a refrigerant, cant remember why, i think it was because it was way to dangerous.

**GuGaCoSa** · 05-14-2005, 06:53 PM

Because it cannot work with copper tubes,NEVER use acetylene in refrigeration systems.

**gclg2000** · 05-14-2005, 08:02 PM

omg, ya don't do it.

**wdrzal** · 05-14-2005, 09:57 PM

Acetylene is a unstable gas ,it can not be compressed without a stabilizing agent.If my memory is correct its maxium working pressure is 15 psi and standard working pressures are below 7.5 psi. under NO circumstances should it ever be used as a refrigerant.

**kayl** · 05-15-2005, 12:49 AM

Originally Posted by pc ice

if you'r system is all steel and you have steel ball's to match..then run it..

says the mad man that tried nitrous oxide.
Heehe dont use that either all it would take is an electrical short and

**Tonic** · 05-15-2005, 12:50 AM

How does look reaction between acetylene and copper?

**_HL4E_HalfLife_** · 05-15-2005, 09:08 AM

Ok thats out. What about nitrogen?

**wdrzal** · 05-15-2005, 09:17 AM

nothing,if you can condense it

**Chris_F** · 05-15-2005, 10:57 AM

How about methane?

**gclg2000** · 05-15-2005, 11:05 AM

ICE, you used methan once didnt ya? I think he did, but it didn't hold load well.

**wdrzal** · 05-15-2005, 11:10 AM

read the chemical make-up of refrigerants. monochlorodifloroMETHANE,diclorotrifloroMETHANE,ec t,ect.........

propane is 90% methane

**gclg2000** · 05-15-2005, 11:31 AM

Sorry walt but what? Adding substiuant groups (or elements) to molecules totally changes the physical properties of the base molecule.

And what you me propane is 90% methane?

**wdrzal** · 05-15-2005, 11:43 AM

of couse it changes them that why methane is flamable and r22 is not, propane comes either from natural gas or oil, natural gas is mostly methane.

**wdrzal** · 05-15-2005, 11:47 AM

I got that wrong propane is in natural gas along with methane

**_HL4E_HalfLife_** · 05-16-2005, 11:32 AM

New pics!! This condenser has a capacity of 20,000 Btu's. The orignal motor for this fan was 220v so i get to get rid of it and put this 115v motor on it.Its a bit stronger than the old 220v motor as well.

Ps. The cap u see in pic 3 is just a point of reference to show the actual size of this condenser.

**wdrzal** · 05-16-2005, 12:20 PM

what voltage is the compressor?

**gclg2000** · 05-16-2005, 01:35 PM

If this is for cascade righ? I'd splice the condenser and use the bottom 1/3 of it or something for air condenser to help subcool the hot gas coming out of the compressor of the 2nd stage.