[esp-r] Re: The position of low-e coating in double glass.

[Ery Djunaedy]

Hi Young-Sub,

I tried to find the menu as indicated in the the attachments you sent. I
could not find any menu where you can plug in different emissivity for
inside and outside surface. What version of ESP-r is this?

All:
Is there a different menu for different install option of ESP-r? I am using
the latest version of ESP-r but I could not find the menu as in Young-Sub's
attachment.

So far if I need to have different emissivity, I did what Achim suggested
below, ie change it directly to the .con file. The only disadvantage of
this work around is that everytime you update the construction file through
the menu (in the zone menu, update all construction), this file got updated,
ie the emissivity will be taken from the database, which has the same value
for inside and outside surface. Then you have to re-input the different
emissivity value in the .con file.

Ery


On 12/11/06, Geissler Achim <Achim.Geissler at josef-gartner.ch> wrote:
>
>  Hi Young-Sub An,
>
>
>
> I do not quite understand what you are doing, however, here are some
> thoughts:
>
>
>
>   - if you are not modeling the double glass as a zone, the low-e in the
> glass cavity has no influence. The U-value of the glass is approximated by
> adapting the thermal resistance of the glazing gap air.
>
>   - the external emissivity of the double glass (pos. 1 and 4) actually
> used in the simulation can be checked in the construction file (.con):
>
>
>
> # for each surface: inside face emissivity
>
>  0.22000,0.99000,0.22000,0.99000,0.90000,0.90000,0.22000
>
> # for each surface: outside face emissivity
>
>  0.22000,0.83700,0.22000,0.99000,0.90000,0.90000,0.22000
>
>
>
> (where "surface" actually should read "construction").
>
>
>
> My experience is that if the correct value is set here, there are feasible
> differences in the calculation results.
>
>
>
> Regards,
>
> Achim
>
>
>
>
>
>
>
>
>   ------------------------------
>
> *From:* esp-r-bounces at lists.strath.ac.uk [mailto:
> esp-r-bounces at lists.strath.ac.uk] *On Behalf Of *????
> *Sent:* Sunday, December 10, 2006 12:12 PM
> *To:* esp-r at lists.strath.ac.uk
> *Subject:* [esp-r] The position of low-e coating in double glass.
>
>
>
> Dear esp-r user
>
>
>
> I analyzed surface temperature according to position of low-e coating in
> double glass.
>
> But, I find out the result that can't understand.
>
> The result of surface temperature is the very same case1 and case4, case2
> and case3.
>
> guess that ESP-r program appear number① value of emissivity int and number
> ④ value of emissivity ext  regardless of glass.
>
> Please, solve the problem.
>
> Thank you.
>
>
>
> Sincerely
>
> Young-Sub An
>
>
> ---------------------------------------------------------------------------------------
>
> Case 1. -> Low-e coating is applied to number④ of glass surface.
>
> Case 2. -> Low-e coating is applied to number③ of glass surface.
>
>         To apply on number③ of glass surface changes the emissivity value.
>
>
> Case 3. -> Low-e coating is applied to number① of glass surface.
>
>         To apply on number① of glass surface inverts glass(dlow24) of case
> 1.
>
> Case 4. -> Low-e coating is applied to number② of glass surface.
>
>         To apply on number② of glass surface changes the emissivity
> value.
>
>
>
>
>
>
> (*^^*)
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