AixLib.Fluid.Actuators.Valves.ExpansionValves.Utilities.FlowCoefficient

# .AixLib.Fluid.Actuators.Valves.ExpansionValves.Utilities.FlowCoefficient

Package that contains models describing different flow coefficients

## Information

This package contains models describing calculations procedures of flow coefficients that are based on a literature review. However, in this package the flow coefficient is implemented in such a way that it fulfills
`ṁ = C*Avalve*sqrt(2*ρinlet*dp)` .
For more information, please checkout AixLib.Fluid.Actuators.Valves.ExpansionValves.BaseClasses.PartialExpansionValve.

#### Commen model variables

Calculation procedures presented in the litarture have some variables in commen and these variables are presented below:

"Commen variables" border="1" cellspacing="0" cellpadding="2" style="border-collapse:collapse;">

Variable | Comment
--- | ---
`A` | Cross-sectional flow area
`dinlet` | Diameter of the pipe at valve's inlet
`pinlet` | Pressure at valve's inlet
`poutlet` | Pressure at valve's outlet
`ρinlet` | Density at valve's inlet
`ρoutlet` | Density at valve's outlet
`Tinlet` | Temperature at valve's inlet
`μinlet` | Dynamic viscosity at valve's inlet
`σinlet` | Surface tension at valve's inlet
`Coutlet` | Specific heat capacity at valve's outlet
`hfg` | Heat of vaparisation

Moreover, two approaches can be identified in general: A polynomial and a power approach. The characteristics of these approaches are presented below.

#### Polynomial approaches

A generic polynomial approach is presented below:
`C = corFact * sum(a[i]*P[i]^b[i] for i in 1:nT)`
Actually, two polynomial approaches are implemented in this package.

#### Power approaches

A generic power approach is presented below:
`C = corFact * a * product(P[i]^b[i] for i in 1:nT)`
Actually, thee power approaches are implemented in this package.

#### References

X. Zhifang, S. Lin and O. Hongfei. (2008): Refrigerant flow characteristics of electronic expansion valve based on thermodynamic analysis and experiment. In: Applied Thermal Engineering 28(2), S. 238–243

Q. Ye, J. Chen and Z. Chen. (2007): Experimental investigation of R407c and R410a flow through electronic expansion valve. In: Energy Conversion andManagement 48(5), S. 1624–1630

## Contents

Name | Description
--- | ---
PolynomialFlowCoefficient | Model describing flow coefficient based on polynomial approach
PowerFlowCoefficient | Model describing flow coefficient based on power approach
SpecifiedFlowCoefficients | Package that cointains flow coefficients that are specified

## Revisions

- October 16, 2017, by Mirko Engelpracht, Christian Vering:
  First implementation (see issue 457).

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