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RE: [EnergyPlus_Support] Trench Heating for moderating window condensation
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
>>
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>> 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
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>
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