Re: [EnergyPlus_Support] Emissivity in Material

[Barry Dicker <bmd@xxxxxxxxxxxxxxxx>]

Most of the infrared camera manufacturers provide documentation that includes the emissivity of specific materials.

On Mon, Dec 12, 2011 at 9:30 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

 

Not sure where you searched. I used the search capabilities of the
documentation and

In the Material object:

Field: Thermal Absorptance
The thermal absorptance field in the Material input syntax represents
the fraction of incident
long wavelength radiation that is absorbed by the material. This
parameter is used when
calculating the long wavelength radiant exchange between various
surfaces and affects the
surface heat balances (both inside and outside as appropriate). For
long wavelength radiant
exchange, thermal emissivity and thermal emittance are equal to thermal
absorptance.
Values for this field must be between 0.0 and 1.0 (with 1.0
representing ?black body?
conditions).

On Tue, 13 Dec 2011 03:24:53 -0000, malindow wrote:
> Dear all,
>
> I am going to simulate the effect of changing emissivity value in the
> material of roof. But I could not find the emissivity in the field of
> Material in IDFEditor. I tried to search in the Documentation but
> only
> found the emissivity for glazing not roof.
>
> Do you have any suggestion about this?
>
> Regards,
>
> Malindo
> Mech. Engineering student
> Singapore
>
>
>

> ------------------------------------

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-- 
Barry Dicker, President
Decent Energy, Inc..
913-440-0744
www.decentenergy.com  

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Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

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