[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] Re: U value Design Builder vs Energy Plus
Dear André,
If thermal bridging is a factor in your wall construction, make sure
that you account for it in your calculations.
Also, the inside / outside heat transfer coefficients used by DB may
be acceptable for your use (how different could they be?)
Finally, "U" factor often has a minor impact on overall energy use,
especially when there are significant internal loads from lighting and
equipment.
With those factors considered, I suspect that the DB "U" will be close
enough for good accuracy.
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Andy Tindale" <andy@...>
wrote:
>
> I guess you would have to increase the thickness of insulation in DB
until
> you acheived the E+ U-value you are aiming for.
>
> Andy
>
> ----- Original Message -----
> From: "André Lopes" <andr_lopes2000@...>
> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
> Cc: <andy@...>
> Sent: Thursday, May 08, 2008 10:07 AM
> Subject: Re: [EnergyPlus_Support] U value Design Builder vs Energy Plus
>
>
> Thank you Andy
> So, how can I solve the problem on E Plus and obtain U = 0,54.
> Regards
> A L
>
>
> ----- Original Message ----
> From: Andy Tindale <andy@...>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Thursday, May 8, 2008 9:41:56 AM
> Subject: RE: [EnergyPlus_Support] U value Design Builder vs Energy Plus
>
>
> U-values calculated and displayed by DesignBuilder use the UK
methodology
> including thermal bridging and specific inside and outside heat transfer
> coefficients. EnergyPlus uses a more detailed calculation method for
> evaluating heat transfer coefficient hence the difference and assumes
> standard ASHRAE inside and outside conditions. Bear in mind that the
> U-values calculated by DesignBuilder are not used in EnergyPlus
simulations.
>
> Andy Tindale,
> DesignBuilder Software
> www.designbuilder. co.uk
>
> -----Original Message-----
> From: EnergyPlus_Support@ yahoogroups. com
> [mailto:EnergyPlus_Support@ yahoogroups. com]On Behalf Of André Lopes
> Sent: 08 May 2008 09:24
> To: EnergyPlus Support
> Subject: [EnergyPlus_ Support] U value Design Builder vs Energy Plus
>
> Dear Energy Plus Team:
> When I inserted a certain Exterior Wall the Design Builder
calculated a U =
> 0,54.
> After, when I exported the file to Energy Plus and made the
simulation, the
> EPlus Report showed a U = 0,6. I think that this also happened for
all the
> other Building Constructions.
> What is the reason?
> Regards
> A L
>
> ____________ _________ _________ _________ _________ _________ _
> ____________ __
> Be a better friend, newshound, and
> know-it-all with Yahoo! Mobile. Try it now.
> http://mobile. yahoo.com/ ;_ylt=Ahu06i62sR 8HDtDypao8Wcj9tA cJ
>
> ------------ --------- --------- ------
>
> The primary EnergyPlus web site is found at:
> http://www.energypl us.gov
>
> The group web site is:
> http://groups. yahoo.com/ group/EnergyPlus _Support/
>
> Attachments are not allowed -- please post any files to the appropriate
> folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu. pdf
under the
> Documentation link and press the "search" button.
> Yahoo! Groups Links
>
>
>
>
>
____________________________________________________________________________________
> Be a better friend, newshound, and
> know-it-all with Yahoo! Mobile. Try it now.
> http://mobile.yahoo.com/;_ylt=Ahu06i62sR8HDtDypao8Wcj9tAcJ
>
> [Non-text portions of this message have been removed]
>
>
> ------------------------------------
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate
> folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf
under the
> Documentation link and press the "search" button.
> Yahoo! Groups Links
>
------------------------------------
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/EnergyPlus_Support/
<*> Your email settings:
Individual Email | Traditional
<*> To change settings online go to:
http://groups.yahoo.com/group/EnergyPlus_Support/join
(Yahoo! ID required)
<*> To change settings via email:
mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx
mailto:EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx
<*> To unsubscribe from this group, send an email to:
EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/