Re: [EnergyPlus_Support] Window shading control with OnIfHighSolarIncident

[Chris Jones <cj@xxxxxxxxx>]

The key is to find realistic values that are based on peoples' behavior 
patterns.  For example, you set a value for when people close the 
shades.  When do the shades get opened again?  When the sun goes behind a 
cloud or the next morning when people arrive for work?  With DOE2.1E, these 
parameters have a huge effect on how much energy DOE2 predicts will be 
saved.  You can use the following as a rough guide, depending on climate:

Daylighting control strategy:
1. On/Off: 10% lighting energy savings
2. Two or three Step dimming: 20% lighting energy savings
3. Continuous Dimming control: 30% lighting energy savings

If the simulation predicts double the savings listed above, re-check your 
assumptions.


At 13:52 19/11/2003, Frederick Winkelmann wrote:
>There is no standard value of incident solar for this type of control. I 
>recommend trying a few different values and see
>what the result is in terms of daylighting and building thermal response. 
>Or you might try optimizing this value using the
>GenOpt program (available free of charge from 
>http://SimulationResearch.lbl.gov). For example, GenOpt could be used to find
>the value that minimizes annual energy use.
>
>Fred Winkelmann
>
>leeslwong wrote:
>
> > I am going to run a commercial building with daylighting control. The
> > window shading control of OnIfHighSolarIncident is going to be used.
> > I have no idea what the recommended values (W/m2) of solar incident
> > on window are. Anyone can give me some references (i.e. books,
> > technical papers, etc.) showing the suggested figures or methods to
> > be used for my case.
> >
> > (50 W/m2 is shown in the example file of daylighting control. Is it a
> > reasonable value for the shading control?)
> >
> > Thanks
> >
> > lee
> >
> >
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Chris Jones, P. Eng.
14 Oneida Avenue
Toronto, ON M5J 2E3
Tel. 416 203-7465
Fax. 416 203-8249




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