On Oct 11, 2011, at 5:06 PM, Horace Heffner wrote:
Does anyone know what units are displayed on the odometer type
display and sweep hands on the water meters used?
It says m^3 on the face, and the dials have x0.1, x 0.01, x0.001
and one with a value I can't read but assume is x0.0001.
MoB has kindly confirmed the values on the dials, based on his water
meter. This means the x0.0001 dial registers 0.1 liter increments.
This I confirmed by looking at time 0:57 to 0:59 in the video:
http://www.youtube.com/watch?v=2-5cFOsisAo
You can see the 0.1 liter sweep hand going very fast. In the two
seconds it moved from 0 to 0.5 liters, giving a flow rate of very
approximately 0.25 liters/sec = 15 liters/min. A bit fast based on
the given average of 10.7 liters/min!
This means the flow meters are excellent for this purpose. Maybe
they weren't read because it is difficult? Time stamped digital
photos taken periodically might be a good idea. Reading the sweep
hands can then be done later.
Interesting. The secondary circuit flow meter can be read at the end
of the test here:
http://www.redmatica.com/media/Thermo1.jpg
I read the meter as 13.1403 m^3, or 1314.3 liters. Given the test
lasted 526 minutes that is 1314.3 liter/(536 min.) = 2.45 liters/min
= 0.0409 liters per second = 40.9 ml/s.
Strange. The secondary flow rate was given as 178 ml/s, or 10.7
liters/min. In 526 minutes that would be 5628 liters, or 5.62 m^3.
It appears the meter began the test at 7.25 m^3.
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
