R134a superheat htc correlations

[Lukezo]

Dear all,

I am modeling a heat pump heat exchanger and have some difficulties determining the superheated heat transfer coefficient of R134a @pressures up to 16Bar and temps up to 90degreeC. Can someone please give me a hint about htc coefficient for enhanced horisontal tubes (diam 7mm, internally finned) fin and tube heat exchanger.

Thanks in advance,
Lukezo

 

[hacksaw]

There are common heat transfer coefficient correlations based on Reynolds number, Prandtl number,the Nusselt number, and metal properties that can be used to estimate the heat transfer coefficient, or you can use CFD to compute it.,

Check your heat transfer text and handbooks.