Need suggestions before building SS

[Supertim0r]

Hey, :)

I just received my last items needed to build a single stage. I only need suggestions on cap tube : size, how long cap tube ? (conroe and kentsfield usage)

Specs :

Danfoss NX11FX
chilly1 evap (http://www.under-the-ice.com/product_info.php?products_id=57&osCsid=af2db05885e56ca2a56c162f7fd5e18d)
36" flex suction line
mach1/2 condenser size (http://www.under-the-ice.com/product_info.php?cPath=33&products_id=80&osCsid=af2db05885e56ca2a56c162f7fd5e18d)
dryer

gas : 404, 507 and possibly 402a

Thanks

Simon

[4Qman]

This is a guide on Cap Tube Length HERE (http://www.xtremesystems.org/forums/showthread.php?t=29694)

Will be a nice Unit mate. :)

[n00b 0f l337]

Gary Lloyd's isnt too accurate though.

[K404]

Hey NoL :) Can ya point us towards more numbers? I have no intention of building at the mo, tho info like that can make for a great guideline :)

[n00b 0f l337]

Personally I'm more a guess, tune, recover, reguess, tune, etc guy. But I'm sure wdrzal or one of the other major frosties will hopefully have a chart we can all oogle over.

[jinu117]

PM sent

[Supertim0r]

I usually play on "big cooling"...not cap tube :(

Thx for the help

[star882]

You might want to use a TXV or CPEV. (CPEV is preferred as it's not generally affected by refrigerant type.) (Note that it might be necessary to use some large diameter cap tube to allow the expansion valve to operate in a greater adjustment range.)

[wdrzal]

You might want to use a TXV or CPEV. (CPEV is preferred as it's not generally affected by refrigerant type.) (Note that it might be necessary to use some large diameter cap tube to allow the expansion valve to operate in a greater adjustment range.)

This is wrong info, Different refrigerants have different pressures, since a cpev work off pressure,even that they can be adjusted ,the pressure may be outside its pressure range.

[star882]

Note that I said *generally*. In other words, you can probably use either R22, R134a, or R507 with the same CPEV. However, a TXV will only work with refrigerants that fit the proper PT curve. (They might work with other refrigerants but adjustment will be tricky at best.)
Obviously, if you switch to R410a or R744, you'll most likely have to replace many parts to make the unit withstand the pressure. But by then, you might as well keep your existing unit and build another one.

[wdrzal]

@ 0 psig r134a compared to r22 has a 26 psi difference at that point.


when you say "generally" that give the person seeking the advice no help ,sice they have no idea how to apply generally.

Valves have a specfic design parameters that they operate between.While most can be adjusted or modified with additional orrifices and springs they are not a one size fits all.

When it comes to tev's the gas in the sensing bulb matters too and this can NOT be changed.

[runmc]

I just used 2.3m of .028 with a small 1/4 hp Tecumseh and had fairly good performance. ;)

[pazza316]

NL11 I use 2.7m - 2.85m 0.031 with great results.

[dottedquad]

Note that I said *generally*. In other words, you can probably use either R22, R134a, or R507 with the same CPEV. However, a TXV will only work with refrigerants that fit the proper PT curve. (They might work with other refrigerants but adjustment will be tricky at best.)

What do you mean by PT curve?

-Thanks,
Rich

[[XC] 2long4u]

Each refrigerant has a specific pressure at specific temperature. Eg: I don't know if this is right but say r134a is at 70 degrees its pressure would be 72psi.

Oh by the way:lastweek: lol or welcome to last year.

[Freddie123]

Hehe necrothreader :P For anyone who is reading this Danfoss have a program called Dancap which calculates captube size. You just give it the parameters (suction gas temp/subcooling and a few others I think) and it gives captube lengths for different diameter cap tubing

[one_servant]

Here's a link everyone: http://www.danfoss.com/United_Kingdom/NewsAndEvents/News/RA+Solutions/DanCap+1.0.htm

[AlphaChicken]

how do you know what to put in there though? how do you find out the condensing temperature, the evaporating temperature, the return gas temperature, and the heat load before the system is even built?