computer air reductions

[Davimont]

Every now and then I have to do suction pipes with a dorsal and drops that maybe end with arms or simple mouths.

not being heavy aspiration jobs, we have always foreseen a diameter of conduct from the beginning to the end of the same diameter but we know that the more you get away from the fan and the more the conduct should go to tighten of diameter.

are you aware of some calculation sheet having to be able to put the basic data as a fan's reach, number of drops and perhaps the speed required within the pipelines? I don't want to draw anything, it would be enough for me to have basic data to make the system more correct and order the pipes of proper diameter.
if then there is an open source software that integrates other calculations, well come.

who does these works habitually, how do these calculations?

 

[meccanicamg]

you can do cfd to check.
otherwise by hand you do the accounts.
yes there are programs that make 1d fluiddynamic analysis

 

[Davimont]

thanks mechanicalmg for the answer and excuse for the delay in the answer.
What formula are we talking about? My academic preparation is not the highest and I don't know how far I can get.

As I said, I do not have to calculate pipelines for km and 10-storey plants. in my company we do relatively short stretches and with few suction points. Load losses may also not consider them but I do not know how much they affect the final result.

Now I'm looking for some resource with the cfd acronym and see what I find.

 

[Marco F inox]

in an intake channel, without counting the load losses, you must at least remove to the area of the large pipe of arrival, the area of each single vent, to pass to the next.
this to have the same scope, between the sum of the vents and the aspirator.
it will be very difficult to find rules, many are variables, such as lengths, shapes, etc.

 

[paulpaul]

This is not bad

SF Pressure Drop Home - SF Pressure Drop

Pressure Drop Homepage: Calculation of pressure drops in pipes.

www.pressure-drop.com

There are many more

 

[Marco F inox]

keep in mind that if you halve the diameter, the flow rate is reduced by 1/4. (you can see it by drawing a circle and inside another circle with diameter equal to the radius)
in plumbing unfortunately you can not comply with the rule above exposed, however with the measures in in inches gas, you get a good compromise more than acceptable.
an inch is 33.25 mm. external while the inch is 20.96 mm. well above half an inch.
then connects the 1" tube with two 1/2", very intuitive, to make a branch, or vice versa to gather.
The only thing that varies is the flow, according to the point where it is detected, pressure and speed change, but these are not important.

 

[Davimont]

Thanks paulpaul, I'll take a look.

thanks also to you rotten for the explanation, I did not know this peculiarity of the inch pipes.