[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[EnergyPlus_Support] Re: Insulating the roof
Thanks Richard and David.
David)
Time ago I started with E+ and made some basic simulations. Then I
started with DB because it was bougth by the institute and I hae to
do many simulations that might take me forever if I use E+ (bless and
curse, E+ is so clearly that it is also too much time wasting). Now
i'm very dissapointed with DB, I'm writting a topic about now.
Ricard)
I will check the properties of the model exported to an idf. I did a
simulation with no HVAC, the temperatures are the same.
The cities I'm simulating almost have no winter. Lets say 6 extremely
hot months, 5 hot to moderate months and 1 cold month. The heatig
requirements are almost null (actually zero for two of the cities).
So, the total energy is almost the cooling energy, and it should
change. I'm writting a topic about.
Daniel
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "David Scheer - L+U"
<david@...> wrote:
>
> Always, always export your DB model to IDF and run from EnergyPlus
native and check inputs and summary tables before trusting the DB
model. DB is a black box with too many unknowns, while E+ is as
transparent as it can get. Use both to take advantage of the clarity
of E+ and the data management of DB.
>
> ----- Original Message -----
> From: Richard Raustad
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Tuesday, June 24, 2008 8:14 AM
> Subject: Re: [EnergyPlus_Support] Insulating the roof
>
>
> Check the construction properties of the roof in the E+ input
file
> generated by DB. Changing the roof insulation in DB should result
in a
> change in the roof properties. If this does not happen you will
not see
> a change in results. Also look at the cooling and heating energy
instead
> of the total energy if you have not done so already. With
increased roof
> insulation, cooling energy use should be reduced and heating
energy use
> will increase. Although I find it hard to believe that changes in
> cooling and heating energy offset each other in hot dry climates,
it is
> possible that the total energy did not change significantly.
>
> Daniel Solís wrote:
> >
> > Hi E+,
> >
> > I simulated a house with DesignBuilder in a very hot and dry
climate.
> > I insuated the roof with EPS polyestyrene. No matter how much
> > insulation I used, the results were almost the same.
> >
> > In DB forum I got the answer that no matter the climate, the
> > temperature and HVAC consuption is entirely driven by internal
gain
> > and so there is no difference insulating the roof.
> >
> > It's all the opposite I have read in the state of the art.
Even, in
> > that specific city I got the weather file from, there is a
government
> > support for people to insulate their roofs because they have a
lot of
> > measurements proving an HVAC reduction of 15-20%.
> >
> > Since DB uses E+ as core program, I'm asking you directly what's
> > happening,
> >
> > Thanks,
> >
> > Daniel
> >
> >
>
> --
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL 32922-5703
> Phone: (321) 638-1454
> Fax: (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
>
> UCF - From Promise to Prominence: Celebrating 40 Years
>
------------------------------------
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/