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Re: [EnergyPlus_Support] Hot Water Radiators - Design Builder vs EnergyPlus
In EnergyPlus, you would have two options:
BASEBOARD HEATER:Water:Convective - this is 100% convective. (A combined
convective/radiant model is in development, but I am not sure when it will be
released.)
Make a small section of wall that contains a LOW TEMP RADIANT SYSTEM:HYDRONIC.
The hydronic tubing cannot be the outer layer of the wall construction, but you
could place a thin layer of metal as the inside surface of the construction and
place the hydronice tubing before that.
Mike
On 8 Jan 2008 at 11:33, André Lopes wrote:
> Hello Andy
>
> Thank you.
> But, if I want to simulate hot water radiators on the wall, what should I choose
> in the "Zones HVAC tab":
>
> "Heating Type": Convective (here I can make the Building Simulation)
> or
> "Heating Type": Radiant / Convective (like this the simulation speed is too
> slow)
>
> Another possibilitie is to export the idf file to Energy Plus. What kind of
> system should I choose here?
>
> Best Regards
>
> A L
>
> ----- Original Message ----
> From: Andy Tindale <andy@xxxxxxxxxxxxxxxxxxx>
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Sent: Friday, January 4, 2008 7:37:42 PM
> Subject: RE: [EnergyPlus_Support] Design Builder Slow Simulations
>
> >One of the reasons for the Slow Simulations is the use of "Radiant Heating
> systems".
>
> Yes for some reason the EnergyPlus 'High Temp Radiant System' used by
> DesignBuilder to represent radiant heating systems runs very slowly. We
> haven't looked into reasons for this yet. It may be related to using many
> 'Surface to which radiant energy from heater is distributed' fields.
>
> This is the only radiant heating system provided by DesignBuilder. If the
> slow simulation speeds are not acceptable, you could either approximate by
> using an air system (many hot water radiators have radiant heat fractions of
> less than 0.2) or look at trying with some of the other radiant systems offered
> by EnergyPlus by modifying the IDF data generated by DesignBuilder.
>
> Andy
>
> -----Original Message-----
> From: EnergyPlus_Support@ yahoogroups. com
> [mailto:EnergyPlus_Support@ yahoogroups. com]On Behalf Of André Lopes
> Sent: 04 January 2008 18:04
> To: EnergyPlus_Support@ yahoogroups. com
> Subject: [EnergyPlus_ Support] Design Builder Slow Simulations
>
> One of the reasons for the Slow Simulations is the use of "Radiant Heating
> systems".
>
> But if I need the following HVAC system:
>
> Heating: water radiators (all zones);
> Cooling: Heat pump + Fan-Coil (only in some zones);
>
> What should be the kind of DESIGN BUILDER HVAC template, at Building level
> and at Zone level, that can:
>
> 1) solve the simulation speed problem;
> 2) fullfils the HVAC System requirements;
>
> Best Regards
>
> A L
>
> ----- Original Message ----
> From: Andy Tindale <andy@designbuilder. co.uk>
> To: EnergyPlus_Support@ yahoogroups. com
> Sent: Thursday, January 3, 2008 5:39:40 PM
> Subject: RE: [EnergyPlus_ Support] Energy Plus IDF Editor
>
> There is a help topic on setting up DesignBuilder models to minimise
> simulation time at:
>
> http://www.designbu ilder.co. uk/programhelp/ working_with_ large_models.
> htm
>
> Andy
>
> -----Original Message-----
> From: EnergyPlus_Support@ yahoogroups. com
> [mailto:EnergyPlus_ Support@ yahoogroups. com]On Behalf Of André Lopes
> Sent: 03 January 2008 17:02
> To: EnergyPlus_Support@ yahoogroups. com
> Subject: [EnergyPlus_ Support] Energy Plus IDF Editor
>
> I am starting to work with Energy Plus (sometimes I use Design Builder as
> Graphic Interface), I would like to know the following:
>
> - What are the main things that I should pay attention when I am
> constructing the Building Model(on Design Builder), to prevent that the
> simulation doesn´t take several hours?
>
> - What should be the better sequence for studying the Manuals of
> EnergyPlus?
>
> - What Document (EPlus Manual or file) should I study to learn how to
> work well with the IDF Editor?
>
> - What Document (EPlus Manual or file) should I study to learn how to
> identify and correct errors, that can appear in the Design Builder Exported IDF
> Files?
>
> Best Regards
>
> A L
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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