BuildingSystems.HAM.ConvectiveHeatTransfer.Gaps.alphaGap

# .BuildingSystems.HAM.ConvectiveHeatTransfer.Gaps.alphaGap

Empirical equation for convective heat transfer coefficient for a parallel gap

## Information

This function computes the convective heat transfer coefficient for a gap between two parallel surfaces with the gap distance `d`, the gap height `h`, the surface temperatures `T1` and `T2` and the gases air, argon, krypton, xenon and SF6.

#### References

Empirical alpha equation by Mac Gregor/Emery (7th edition of VDI-Waermeatlas Fc3 formula 15)

#### Interface

>     function alphaGap
>       input Modelica.Units.SI.Temperature T1 "Surface temperature 1";
>       input Modelica.Units.SI.Temperature T2 "Surface temperature 2";
>       input Modelica.Units.SI.Length d "Gap distance";
>       input Modelica.Units.SI.Length h "Gap height";
>       input Integer gas "Gas within the gap: 1:air, 2:argon or 3:krypton, 4:xenon, 5:SF6";
>       output Modelica.Units.SI.CoefficientOfHeatTransfer value;
>     end alphaGap;

## Revisions

- Jan 16, 2014 by Christoph Nytsch-Geusen:
  First implementation.

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