Help needed regarding results.

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Hello everyone,

I have been doing an academic project where i am trying to find out the
best percentage of facade glazing which results in optimal energy
consumption in IT office building.

Is there a possibility of doing parametric studies pertaining to change in
facade glazing percentage or lets say WWR.

I tried a floor plan with three different types of glasses and different
percentages.
But as i reduce the facade percentage from 100% to 30% the energy
consumption report says that there is reduction in energy consumption.but
There is no difference in lighting loads . the only change in the report is
for space cooling. The reduction in the glazing definitely results in
increase in lighting loads in a fully conditioned office building.

This is not being projected in the results.could some one help me on how to
proceed in this regard.

Thanking you,

P.Sitha
Pursuing M.Arch

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Hi,
Did you turn on the "daylighting controls" so that the model considers
daylighting in calculating the lighting load? If you turn on the
"Daylighting controls" (Wizard Screen 1/41) , only then eQuest will model
the daylighting savings. WWR can be set only in the wizard mode. I believe
it requires little advanced knowledge to implement parametric runs for WWR
in eQuest detailed mode.

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Hi ,

I have turned on the day-lighting controls in wizard 1 and retained the
default data for day lighting in further wizards. But is there any other
way to turn on day lighting for the zones? or any other wizards where i
have to take care of daylighting

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

In detailed edit model you can go to space-daylighting and then choose
"yes" for daylighting. You can specify the schedule and control type over
there as well. Hope it helps!

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Hello Nicholas,

I am here with the file.

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

What you are proposing is in fact a very sophisticated/complex problem with a lot of interactive variables in play.

You may need to share the project file to help others on the list determine what is awry with your inputs, if you are still having issues. If daylighting is applied to spaces with fenestration, you should certainly see a direct effect on lighting consumption and likely also indirect effects on fans/cooling/heating enduses as you vary WWR.

Recommended reading for a very similar study is attached. WinOpt is a derivative of GenOpt specifically leveraging the energyplus engine, though note GenOpt is ?engine-agnostic? and this study could have been alternatively performed with doe2/eQuest.

I might also suggest that you might consider further selection of your ?optimum? results to consider first-cost of construction (as a function of WWR and the various glazing fenestration unit selections), and also to consider recording the effect on (and perhaps constrain by a cap for) unmet heating/cooling hours that occur with various optimization variable combinations.

~Nick

------------------------------------------------------------------------------------------------------------------------------

Nick Caton, P.E.

Senior Energy Engineer
Energy and Sustainability Services
North America Operations
Schneider Electric

D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

A few notes:

1. You didn?t provide the weather file, but substituting a public TMY3 in Wisconsin I could observe an expected shift in space lighting after halving your window heights. It?s possible something is up with your weather file.

2. Be aware your wizard WWR % inputs don?t have any effect once you?ve initiated custom window placements. If you intend to ?step back? to a place where those % inputs are leveraged you might want to just tweak your zone mapping (see the next point).

3. Recognizing the building footprint may be purposefully arbitrary, be aware the highlighted zone comprising the majority of your building footprint should probably be broken up to separate core vs. unique fa?ade orientations to mimic a real-world daylight dimming control scheme. That way you?ll end up with one sensor per fa?ade:

------------------------------------------------------------------------------------------------------------------------------

Nick Caton, P.E.

Senior Energy Engineer
Energy and Sustainability Services
North America Operations
Schneider Electric

D 913.564.6361
M 785.410.3317
E nicholas.caton at schneider-electric.com
F 913.564.6380

15200 Santa Fe Trail Drive
Suite 204
Lenexa, KS 66219
United States

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

It is really going to depend on the location of the daylight sensor in
relation to the window. If changing the window dimensions does not effect
the light falling on the sensor it will not have an impact on it. You could
try putting two sensors in the space at different depths.

If you want to perform a much more detailed analysis you should look into
Daysim (*www.daysim.com/*

)

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Hi Sitha,

I mean you are trying to analyse the WWR based analysis on different
facades.
Try configuring out different percentages of glazing percentage of the wall
on different facades and analyse it.
If one has to get the same overall load then one can increase equipment or
lighting load by iterating it.
For purpose you can have different WWR on different facades.
As per me in Northern hemisphere of the globe one can get the best as
facade as North west which can have the best varying WWR and South or
south west as worst facade which can have least varying WWR.
For reference you can have a look at the GRIHA guideline volume-3 as it has
that section which has window glazing and WWR based insolation and other
discussions.

So as per me if you have to take least amount of WWR then choose south-west.

*Thanks,*
Sharad.Kumar|Engineer.
Green Horizon Consulting LLP.
Gurgaon.
India.

---------- Forwarded message ----------

via Equest-users's picture
Joined: 2016-07-15
Reputation: 400

Hello Every one ,

Thank you very much for your valuable support.

I have switched on day lighting and tried to take in multiple zones to
increase the no of sensor points.

But yet the comparative analysis results are pretty much the same.I
couldn't trace out the defect.
I will go through The GRIHA guideline as well .

Thank you,
Sitha.

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Joined: 2016-07-15
Reputation: 400