Controlled rate element
This is the System Dynamics controlled restricted Rate
element, whereby the rate itself is determined by a single variable
in its laundry list. This element is a restricted rate element with
the additional feature that the upstream level can control the flow
by telling it that it is empty, and that the downstream level can
control the flow by telling it that it is full. This is
accomplished by two Boolean control signals from the upstream and
downstream levels to the rate element.
The controlled rate element must be placed between two
controlling levels.
The model contains a dissipative loss of enthalpy (but not mass)
to the environment. Mass is always conserved. By attaching an
R element to a 1 junction, we guarantee that the mass
flow is not affected at all by the dissipative term. Only enthalpy
is being dissipated.
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