txv / orifice

[ac&r junky]

ive installed lots of walk in coolers and freezers and would like to know what exactly the orifice after the txv before the distributor tubes is for..... depending on the refrigerant you need to install the right one..... this is a question that i would like to intelligently answer the next time my buddies call me for tech support [ cant know everything] but its nice to try I know someone out there will probably tell me to call bohn or larkin etc but with those guys you dont always get the answer you are looking for if your a tech in the field then you know what im talking about any help would be greatly appreciated......................................

[selfemployed]

2 things - pressure drop across the valve & feeds distributer tubes evenly. I'll get you the sporlan literature for it. http://sporlan.jandrewschoen.com/refrigerants.shtm First 1 should be what your looking for.
Andy or Ice can take it from there.

[ac&r junky]

i under stand the evenly distributing freon to all distributers but the different orifices for different refrigerants still is a little confusing and could you explain what you mean by pressure drop across the valve i still want to here more but would like literature from sporlan but the only thing there is that soporlan valves dont come with the orifice it always comes with the evap section thankyou 'selfemployed' for the site

[Andy Schoen]

You are referring to the distributor nozzle. For pressure drop type refrigerant distributors, aka Sporlan distributors, the nozzle provides a focused refrigerant flow which allows the refrigerant to disperse evenly inside the distributor body.

If the nozzle is too large, it doesn’t provide enough pressure drop to provide a focused flow, resulting in possible poor refrigerant distribution.

If the nozzle is too small, the resulting pressure drop will be excessive, causing the TEV to starve at design load conditions.

[sarpanch2001]

You are referring to the distributor nozzle. For pressure drop type refrigerant distributors, aka Sporlan distributors, the nozzle provides a focused refrigerant flow which allows the refrigerant to disperse evenly inside the distributor body.

If the nozzle is too large, it doesn’t provide enough pressure drop to provide a focused flow, resulting in possible poor refrigerant distribution.

If the nozzle is too small, the resulting pressure drop will be excessive, causing the TEV to starve at design load conditions.

best answer you can get:)

[frigeguy]

You are referring to the distributor nozzle. For pressure drop type refrigerant distributors, aka Sporlan distributors, the nozzle provides a focused refrigerant flow which allows the refrigerant to disperse evenly inside the distributor body.

If the nozzle is too large, it doesn’t provide enough pressure drop to provide a focused flow, resulting in possible poor refrigerant distribution.

If the nozzle is too small, the resulting pressure drop will be excessive, causing the TEV to starve at design load conditions.

Thankyou Andy.... I know what its about first hand, but thats a great description. If not installed the the coil is uneven, some passes may freeze up while others do very little, same goes for oversized. They come with the coil, sized according to the capacity of that coil, then select type of refrigerant used. Different refrigerants use different flow rates (gpm) and different pressure drops across the TXV to do the same amount of work ( btu's )

[selfemployed]

Can't beat a man at his own game. Was good to meet you in person too.

[stanbyyourword]

i would have just said velocity , but very complete answer ;) , i was wondering if anyone on the forum is installing xdx valves at present or maybe start a discussion about existing installations and positive or negative feedback? regards

[icemeister]

It's a Tech Topics pdf on refrigerant distribution:

www.heatcraftrpd.com/resources/techtopics/Tech%20Topics%20Distributor.pdf -

I prefer to do installations with the flow vertically down. This helps negate the effects of gravity on the distribution pattern...especially at low loading.

[ac&r junky]

thanks to all for the info and sites ...........enjoyed the discussion AC&R JUNKY