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@yahoogroups.com, "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@yahoogroups.com > 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 -