[TRNSYS-users] Hconv and convective heat transfer coefficient

[adnan rasheed]

Dear  Wirich FREPPEL,

Recently i did some work related to  internal and external convective heat
transfer coefficient and its effect on  temperature  and Overall heat
transfer coefficient you can read the model calibration section of the
following paper "Development of a model to calculate the overall heat
transfer coefficient of greenhouse covers" . Hope this will help you.if you
have any question you are most welcome.

here is the link of the paper

http://revistas.inia.es/index.php/sjar/article/view/10777/3790


Adnan Rasheed

On Wed, Feb 28, 2018 at 11:21 PM, Wirich FREPPEL via TRNSYS-users <
trnsys-users at lists.onebuilding.org> wrote:

> Hi everyone,
>
> I ran 3 different simulations with TRNSYS, in which the only parameter I
> changed was the convective heat transfer coefficient CHTC (as seen in
> picture 1). It seems that nothing really differ from a simulation to
> another, though I tried with h=1, then h=100 (see picture 6 which shows the
> airnode temperature). Then, in order to identify the problem, I set as
> output the HCONV (type 108) and the resistance between the surface and the
> starnode Req (type 86).
>
> Two observations :
>
> 1) HCONV does not correspond to the CHTC I set in TRNBUILD (even by
> dividing it by the surface area)
>
> 2) Req is very close to 0. I guess that's why I observe no real difference
> between each simulation.
>
> So I've got a few questions:
>
> 1) What am I actually observing with HCONV?
>
> 2) Why is Req close to 0 ?  And what does it mean? (I assume that when
> Req=0, there is no heat transfer by convection between the surface and the
> airnode)
>
> Thanks in advance for the clarification
>
> --
> Wirich FREPPEL
> Ingenieur Doctorant en Recherche & Developpement
> Centre R&D de Noirot - Groupe Muller
> 8 rue Louis Ampere, 02030 Laon
> +33 (0)3 23 27 31 99
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at lists.onebuilding.org
> http://lists.onebuilding.org/listinfo.cgi/trnsys-users-onebuilding.org
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/trnsys-users-onebuilding.org/attachments/20180301/3cc78152/attachment.htm>