|
|
Testing and Benchmarking Discuss, design, and debate ways to evaluate the performace of he goods out there. |
Thread Tools |
05-25-2004, 05:28 PM | #1 |
Cooling Neophyte
Join Date: Dec 2003
Location: Utahr
Posts: 22
|
Flow measurement questions
I'm casting about for ideas regarding digital flow rate measurement for wb testing. There are a number of methods, each having its technical and cost advantages/disadvantages.
Here are some of the types I stumbled on, are there any others that should be considered? turbine magnetic ultrasonic (doppler vs. time-of-flight) vortex coriolis pressure differential Any relevant observations or experiences? |
05-25-2004, 06:38 PM | #2 |
Responsible for 2%
of all the posts here. Join Date: May 2002
Location: Texas, U.S.A.
Posts: 8,302
|
Because the availability of different pressures is going to be limited due to the choice of pumps, a lot of these meters are going to restrict your testing ability. It's really not possible to categorize one type of meter for that particularity: you might be able to find something that works well within the types that you've listed, even though they usually offer a high restriction.
A lot of the types you've listed can be fairly expensive, and that would probably become a factor as well. |
05-25-2004, 07:07 PM | #3 |
CoolingWorks Tech Guy Formerly "Unregistered"
Join Date: Dec 2000
Location: Posts: 2,371.493,106
Posts: 4,440
|
eh, a bit too general there Ben
magnetic, ignore the rest 1/4"ID flowtube search Danfoss on this forum for more info or see my old musings |
05-25-2004, 11:06 PM | #4 | |
Cooling Neophyte
Join Date: Dec 2003
Location: Utahr
Posts: 22
|
Quote:
|
|
05-25-2004, 11:16 PM | #5 |
CoolingWorks Tech Guy Formerly "Unregistered"
Join Date: Dec 2000
Location: Posts: 2,371.493,106
Posts: 4,440
|
read the specs of the model you're interested in
normal water is fine |
06-19-2004, 12:49 PM | #6 |
Cooling Neophyte
Join Date: Jun 2004
Location: Bergen, Norway
Posts: 7
|
I am interrested in the same, beeing able to measure the preassure in of my water system.
I was considering using a simple unit that you can find in many OC webshops: http://www.microplex.no/rubweb/varer.asp?ARTNR=AC53021 It allows water circulation to be translated to rpm, and input on a regular fan sensor. More water pr. sec = the turbine spins faster = more rpm. But, am I correct in assuming that if the turbine spins twice as fast as earlier, the preassure has also doubled? is it linear like that? If so, it would only be a matter of finding out how many rpm = 1psi, and you could easily calculate it from there. You need to have some real equipment to find out the rpm/psi ratio first though =/ -Stigma EDIT: Huckleberry, (pure)water is not very conductive, but it IS very affected by magnetic fields. This is because water molecules are polarized (one side of the molecule has a significantly more positive side, and the other has a significanly more negative side). If you've been through basic chemestry, you might remember =) In other words, you shouldnt have problems with water. microwave ovens are actually based on the whole fact that water is very easily affected by magnetic fields. |
06-19-2004, 09:08 PM | #7 | |
Cooling Savant
Join Date: Jan 2004
Location: Alberta
Posts: 631
|
Quote:
|
|
06-20-2004, 01:02 AM | #8 |
Responsible for 2%
of all the posts here. Join Date: May 2002
Location: Texas, U.S.A.
Posts: 8,302
|
Listen to Bill: it works either way, it's all in the manual! The only thing you might have a problem measuring, is peanut butter...
|
06-20-2004, 10:33 AM | #9 |
CoolingWorks Tech Guy Formerly "Unregistered"
Join Date: Dec 2000
Location: Posts: 2,371.493,106
Posts: 4,440
|
nah, use a screw pump - be ok
|
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
|
|