diff --git a/Buildings/Fluid/HeatExchangers/Boreholes/BaseClasses/convectionResistance.mo b/Buildings/Fluid/HeatExchangers/Boreholes/BaseClasses/convectionResistance.mo index d4db1d46fac..870c4e61d5f 100644 --- a/Buildings/Fluid/HeatExchangers/Boreholes/BaseClasses/convectionResistance.mo +++ b/Buildings/Fluid/HeatExchangers/Boreholes/BaseClasses/convectionResistance.mo @@ -48,7 +48,7 @@ This model computes the convection resistance in the pipes of a borehole segment with heigth hSeg.

-The correlation of Dittus-Boelter is used to find the convection heat transfer coefficient as +The correlation of Dittus-Boelter (1930) is used to find the convection heat transfer coefficient as

Nu = 0.023   Re0.8   Prn, @@ -61,7 +61,16 @@ We selected n=0.35, as the reference uses n=0.4 for heating and n=0.3 for cooling. Dittus-Boelter's correlation is valid for turbulent flow in cylindrical smooth pipe.

- ++

References

+

+Dittus P.W. and L.M.K Boelter, (1930). + +Heat transfer in automobile radiators +of the tubular type. +Univ Calif Pub Eng, 2(13):443-461. +(Reprinted in Int. J. Comm. Heat Mass Transf. 12 (1985), 3:22). +DOI:10.1016/0735-1933(85)90003-X. +

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