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Thread: Velocities of R404a
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07-02-2007, 09:40 AM #1
Velocities of R404a
Hi everybody
I`m trying to dimensioning some refrigerant pipes, but I don`t know wich are the recommended refrigerant velocities. Could someone recommend me some values for the different system lines (suction, liquid, discharge, hot-gas defrost)?
I`m using Solkane solution for this calcs, but If anyone have a different solution, I`m all ears.
Thanks a lot.
RCRLast edited by refrigeracioncr; 07-02-2007 at 11:52 AM.
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10-02-2007, 10:03 PM #2
Re: Velocities of R404a
Danfoss has software. They call it "DIRcalc".
I am in Canada and I find that the Solkane software has funny copper pipe sizes. Danfoss is better in that regard.
The Dupont web site has some information. I had downloaded it but I cannot find the link. They give velocity and pipe size charts. Not as convienient as software but a good guide.
Finally I am told that if POE oil is used it is completely miscible with R404a and velocity is not an issue. I am also told that there are minimum velocities that must be considered in suction and discharge llines. The numbers that I have found are 4-15m/s and 8-12m/s for vertical risers and 0.3-1m/s for liquid lines. And as always pressure drop must be a consideration.
If you find anything else I would be interested in hearing from you.
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11-02-2007, 05:31 PM #3
Re: Velocities of R404a
http://us.refrignet.danfoss.com/SW/U...n_us/index.htm
i think this is the link to the danfoss site to download the information
regards
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16-02-2007, 11:41 PM #4
Re: Velocities of R404a
Yes that's the link.
Thank you
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17-02-2007, 04:06 PM #5
Re: Velocities of R404a
Hi, all
This is old version 1.13...
try this one: Ver 1.14
http://www.danfoss.com/NR/rdonlyres/...DirCalc114.zip
Best regards, Josip
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