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Re: [EnergyPlus_Support] Re: S.O.S
A couple of things jump out at me . . .
Are you modeling fresh air requirements? I see INFILTRATION and VENTILATION
objects, but it's not clear if the INFILTRATION is just infiltration or is it
increased to include fresh air?
The model has one zone per floor with large areas of south and north facing
glass. Is the building truly open plan over the entire floor? If not, it may
be necessary to model at least a north and south zone on each floor. It is
likely in the real building that that south side is warmed beyone the heating
setpoint by the sun at times when the north side needs heating. But in this
model all of the south solar gains will be distributed throughout the entire
floor allowing better utilization of the solar.
Mike
On 17 Feb 2006 at 17:45, Rory Walsh wrote:
>
> Hello All
>
> Would anybody have time to review an input file for me?
>
> My research masters is supposed to be investigating the influence
> which thermal mass has on the energy performance of naturally
> ventilated office buildings.
>
> I am stuck though.
>
> The model which I am hoping to use as the base model in a set of
> parametric studies is not performing as I had expected.
>
> In my model the annual heating energy consumption (approximated using
> a Compact:Purchased Air object) for this building in Dublin is 22kWhrs/m2.
> But UK benchmark figures for space heating in this type of office
> building range from 70 kWhrs/m2 (Good Practice) to 150 kWhrs/m2 (Typical).
>
> I know the system I am using is an ideal system, but even when I
> incorporate crude factors to account for boiler efficiency,
> distribution losses, imperfect control etc.. there still seems to be
> a significant difference between my models performance and the
> benchmark figures.
>
> I must be setting up my model incorrectly.
>
> If anybody could help, I would be very grateful.
> I will upload the file to the yahoo database.
>
> Thanks again
>
> Rory
>
>
>
> This is a brief description of the model.
>
> File Name: Open Plan Office, Dublin
>
> Floor Area: 1495 m2
> Stories: 4
> Zones: 4
> % Glazed Area: 60
> External Wall U-Value (W/m2.K) : .35
> Roof U-Value (W/m2.K) : .251
> Ground Floor Slab U-Value (W/m2.K) : .8
> Glazing U-Value (W/m2.K) : 2.4
> Glazing SHGC: .6
> Infiltration: 1 ACH (constant day+ night, all
> year)
> Occupant Density (people/m2): .07
> Occupant Gains (W/person): 115
> Lighting Gains (W/m2): 9 (controlled to switch of at 300 lux)
> Office Equipment (W/m2): 15
>
>
>
>
> Rory Walsh
> UCD Energy Research Group
> School of Architecture, Landscape & Civil Engineering
> University College Dublin
> Richview, Belfield, Dublin 4, Ireland.
> http://erg.ucd.ie
>
>
> Tel: +353-1-716 2682
> Fax: +353-1-283 8908
>
>
>
> 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
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>
> EnergyPlus Documentation is searchable. Open EPlusMainMenu.idf and press the
> "search" button.
>
> Yahoo! Groups Links
>
>
>
>
>
>
>
>
>
========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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