Natural Gas Consumption
Natural Gas Consumption
(OP)
Anyone know the formula for calculating the volume of natural gas used if the orfice size is known and the pressure is known? I am trying measure natural gas consumption for a residential application. I would love to have 4-20mA signal off of a residential gas line, but they are pricey. Anyone know of a reasonable way to measure this usage(besides a monthly gas bill)?





RE: Natural Gas Consumption
Q = 1658.5*A*k*the sq.root of (press.drop divided by the S.G. of the gas).
Q = cu.ft./hr
A = area of the orifice
k = coefficient of friction of the orifice
press. drop = normally the manifold pressure
S.G. of CH4 = .6
If the "k" factor is unknown, use .9 (90%)
Hope this helps.
kbs
RE: Natural Gas Consumption
If this is in fact your case, and you can apply the formula that kbs provided then consumption is simply flow rate times operating time.
I suppose pricy is a relative term, but it seems like gas flow (or gas consumption, which seems like what you are really after) should be pretty common, and available from multiple sources, and hence pretty cheap.
RE: Natural Gas Consumption
RE: Natural Gas Consumption
while i'm not familiar with mfg, make, model #, etc., i've seen new residential properties that have remote metering monitoring capabilities install (i.e. telephone wire).
a suggestion - install a pd meter downstream of gas provider's meter and read the meter.
-pmover
RE: Natural Gas Consumption
Q = cu.ft./hr
A = sq.ft.
Press. drop = "w.c.
Also, as I have seen very few high pressure residential systems, I only provided a low pressure orifice flow formula.
Cheers, kbs.