[esp-r] Re: convective heat transfer coefficients in ESP -r

[Vítor Leal]

Dear Gunter & All,

It was me who put the vertical heat channel, buoyancy-flow correlations 
into ESP-r (incl. the Bar-Cohen & Rohsenow correlation). All those 
correlations depart from the channel wall temperatures, then go to 
Rayleigh number(s), then to Nusselt and wall convection coefficient 
values.  The air velocity is dynamically calculated as function of the 
glazing temperature, which then influences the glazing temperature.

I used/developed them for air gaps of a naturally ventilated window, 
with gaps of 2 and 4 cm.

I haven't looked at the latest versions of ESP-r, but I guess that it 
shall be mostly unchanged in that part.

The details are in my thesis, at sections 2.3, 4.3 and chapter 6. It is 
written in English and you can download it from:
http://paginas.fe.up.pt/~vleal

I recommend that you use small time steps (1 or 5 minute) time-steps if 
you model this way.

Kind regards,
Vítor

Pueltz, Gunter wrote:
> To the ESP-r fan club:
>
> Can anyone provide some informations about the Bar-Cohen and Rosenhow
> correlation
> for convective heat transfer coefficients in an open, vertical channel (only
> buoyancy driven air flow) ?
>
> Does this correlation take the air velocity within a channel into account ?
> Is the air velocity calculated according to the results of the
> air-flow-network ?
> The channel itself is a zone, which is linked with an air flow node ....
>
> What is the best approach for the htc in an open, vertical channel with
> intensive
> air flow (one side of the channel is very hot: it is the wall of a turbine)
> ...?
>
> Any comments are appreciated !
>
> Best regards,
> Gunter 
>
> --
> Gunter Pültz
>
> Müller-BBM GmbH
> Robert-Koch-Straße 11
> 82152 Planegg
> Telefon +49 (0)89 85602 - 336
> Telefax +49 (0)89 85602 - 111
> http://www.MuellerBBM.de 
>
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>
>   

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