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Hydraulic
Analysis Software
for the Design, Simulation and Management of Water
System Pipe Networks
all within the Total AutoCAD ™ Environment
Using the industry - proven EPANET ™ Hydraulic
Analysis Engine
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Emitters
are devices associated with junctions that model
the flow through a nozzle or orifice. In these
situations the demand (i.e. the flow rate through
the emitter) varies in proportion to the pressure
at the junction raised to some power.
The
constant of proportionality is termed the "discharge
coefficient".
For nozzles and sprinkler heads the exponent
on pressure is 0.5 and the manufacturer usually
states the value of the discharge coefficient
as the flow rate in gpm through the device at
a 1 psi pressure drop.
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Emitters
are used to model flow through sprinkler systems and
irrigation networks.
They can also be used to simulate leakage in a pipe
connected to the junction (if a discharge coefficient
and pressure exponent for the leaking crack or joint
can be estimated) and compute a fire flow at the junction
(the flow available at some minimum residual pressure).
In the latter case one would use a very high value
of the discharge coefficient (e.g., 100 times the
maximum flow expected) and modify the junction's elevation
to include the equivalent head of the pressure target.
When
both an emitter and a normal demand are specified
for a junction, the demand that HydrauliCAD reports
in its output results includes both the normal demand
and the flow through the emitter.
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Bellingham WA, USA., Vancouver BC, Canada
Epanet
is a registered trademark, Autodesk™,
and AutoCAD™
are registered trademarks of Autodesk, Inc.™
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Built
to the Very Highest Level of the AutoCAD™
Authorized Developer Standards
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