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Merge branch 'issue1937_checkValve' of github.com:ibpsa/modelica-ibpsa
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AntoineGautier committed Oct 21, 2024
2 parents 11097a8 + 178f961 commit f7e0484
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10 changes: 4 additions & 6 deletions IBPSA/Fluid/FixedResistances/CheckValve.mo
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Expand Up @@ -153,21 +153,19 @@ The basic flow function
with regularization near the origin, is used to compute the mass flow rate
through the fully closed and fully open valve, respectively.
The valve is considered fully closed when subjected to a negative pressure drop,
and its flow coefficient <i>k</i> is then equal to <code>l * Kv_SI</code>
and its flow coefficient <i>k</i> is then equal to <code>l * Kv_SI</code>,
where <code>Kv_SI</code> is equal to <code>Kv</code> but in SI units.
The valve is considered fully open when the pressure drop exceeds
The valve is considered fully open when the pressure drop exceeds
<code>dpValve_closing</code>,
and its flow coefficient <i>k</i> is then equal to <code>Kv_SI</code>.
For valve positions between these two extremes, a quintic spline interpolation
is applied to determine the mass flow rate as a function of
For valve positions between these two extremes, a quintic spline interpolation
is applied to determine the mass flow rate as a function of
the pressure drop across the valve.
</p>
<h4>Typical use and important parameters</h4>
<p>
The parameters <code>m_flow_nominal</code> and <code>dpValve_nominal</code>
determine the flow coefficient of the check valve when it is fully open.
A typical value for a nominal flow rate of <i>1</i> m/s is
<code>dpValve_nominal = 3400 Pa</code>.
The leakage ratio <code>l</code> determines the minimum flow coefficient,
for negative pressure differences.
The parameter <code>dpFixed_nominal</code> allows to include a series
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