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[EnergyPlus_Support] Re: Trench Heating for moderating window condensation

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Re: Trench Heating for moderating window condensation
From: "Elmer Morrissey" <elmofuddly@xxxxxxxxx>
Date: Thu, 23 Feb 2006 10:29:06 -0000
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Thanks for the help everyone, it is very much appreciated.

Kind regards

-Elmer


-- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Griffith, Brent" 
<brent_griffith@...> wrote:
>
> Note that in EnergyPlus one can "play with" non-uniform zone air 
temperatures near the window in using these objects: ROOMAIR MODEL, 
USER DEFINED ROOMAIR TEMPERATURES, ROOMAIR TEMPERATURE 
PATTERN:SURFACE MAPPING.  See the example file called 
UserDefinedRoomAirPatterns.idf where this is being done in the zone 
called  ZN1_SW_1. 
>  
>  
> 
> -----Original Message-----
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx 
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx]On Behalf Of fred buhl
> Sent: Wednesday, February 22, 2006 10:56 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: Re: [EnergyPlus_Support] Trench Heating for moderating 
window condensation
> 
> 
> If nonuniform air mixing is expected to be significant, then 
EnergyPlus 
> would not give a good
> analysis of the problem. If the system can be designed to produce 
> well-mixed air near the entire
> window, EPlus can do a good job - in particular, it can do a good 
job of 
> calculating window glass
> surface temperatures & the user can vary the inside film 
coefficients as 
> desired.
> 
> Fred Buhl
> 
> Edward G. Lyon wrote:
> 
> >I don't think EnergyPlus can do this analysis properly.  There is 
even mixing of zone air so any updraft at a window is not modeled.  
I think you need to use CFD for a better estimate of performance.  I 
typically model the glass and frame system in THERM and then play 
with the inside boundary for both temperature and film coeficients 
(air speed) to find out what is needed for the window frame and 
glazing performance, then I try to make it happen in the design.
> > 
> > 
> >Ned Lyon, Staff Consultant
> > 
> >Simpson Gumpertz & Heger Inc.
> >41 Seyon Street, Bldg 1 Suite 500
> >Waltham, Massachusetts  02453
> > 
> >781-907-9350
> >
> >________________________________
> >
> >From: EnergyPlus_Support@xxxxxxxxxxxxxxx on behalf of fred buhl
> >Sent: Tue 2/21/2006 2:35 PM
> >To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> >Subject: Re: [EnergyPlus_Support] Trench Heating for moderating 
window condensation
> >
> >
> >Elmer - could you explain what trench heating is?
> >
> >Fred Buhl
> >
> >Elmer Morrissey wrote:
> >
> >  
> >
> >>Hi all,
> >>
> >>Can anyone give me some preliminary advice on simulating trench
> >>heating in E+? I want to use it to control the effects of it and
> >>attempt to advice a client if they can turn it off and not find
> >>condensation on an extremely large glazed façade.
> >>
> >>I have considered using a baseboard heater linked to the hot 
water
> >>plant. Is this the best way forward?
> >>
> >>Kind regards
> >>
> >>-Elmer 
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>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.idf 
and press the "search" button.
> >>
> >>Yahoo! Groups Links
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> 
> >>
> >>    
> >>
> >
> >
> >The primary EnergyPlus web site is found at:
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> >
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- RE: [EnergyPlus_Support] Trench Heating for moderating window condensation
  - From: Griffith, Brent

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