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harsen
07-04-2007, 09:22 AM
Hai,
How to calculate the equivalent length for the refrigeant piping Elbows

Argus
07-04-2007, 10:22 AM
.

Most of the refrigeration text books will have tables showing the approximate resistance of common fittings expressed as an equivalent length of pipe.

The ASHRAE Handbooks, the ARI Refrigeration and Air Conditioning Handbooks should have them and finally try Japanese manufacturers’ technical data for VRF equipment, as it is a design component in those types of systems.

As it’s an approximation, you may find variance in the various tables that are available.

.

alexdouglas1969
07-04-2007, 11:58 AM
At college they told us to add 1 metre for each 90.

Cofreth
07-04-2007, 01:53 PM
At college they told us to add 1 metre for each 90.

I guess to minus 1 metre for each 90 added,isn't it? :D

Peter_1
07-04-2007, 05:52 PM
Short turn or long turn, makes a whole difference and it depends also on the size of the lines.

Peter_1
07-04-2007, 05:53 PM
Oops, do you have/need a copy of this table?

Brian_UK
07-04-2007, 11:45 PM
There are some equations out there....

Here is one source to start with...

http://www.cheresources.com/eqlength.shtml

harsen
08-04-2007, 05:38 AM
Oops, do you have/need a copy of this table?

Can u plz post the copy of this table

Peter_1
08-04-2007, 10:46 AM
Here you are

Peter_1
08-04-2007, 10:49 AM
If it is not readable enough, I will rescan it in a higher then75 dpi resolution and post it on an external server.
This was the max allowable dpi without exceeding 100 kb.

harsen
09-04-2007, 05:47 AM
Thank u for ur post

nh3simman
11-04-2007, 05:10 AM
For the best data on fitting pressure drops, get the Crane Technical Paper 410.

This includes all fittings and many different types of valves.

Crane even have software that you can use to browse fittings.

nh3simman
11-04-2007, 05:13 AM
Here is the link to the Crane software and technical paper.

http://www.flowoffluids.com/