Re: [EnergyPlus_Support] WCS, I/O Ref P.92 Fig.11

["Michael J. Witte" <mjwitte@xxxxxxxx>]

If you use WCS, all zone origins and north axis values are ignored 
for all surface geometry.

If you use WCS or Relative coordinates the daylighting reference 
points are always relative to the zone origin.  

If you leave your zone origins all at 0,0,0, then your daylighting 
reference points are equivalent to being in WCS.

The warning for non-zero zone origins with WCS is just a warning to 
get your attention.  If you surface vertices are all in WCS and your 
daylighting reference points are relative, then you may ignore the 
warning.

Figure 11 is not correct, the axes are mislabeled.  This figure 
illustrates the use of the building north axis command and the bottom 
arrow should be labeled true north and the other arrow labeled 
building north.





On 5 Jun 2003, at 6:03, waspoorboy wrote:

> I/O Ref page.92 Fig.11
> ===Is my following understanding correct ?===
> If I use WCS in EnergyPlus, then the zone origin I input 
> for Zone1 in Fig.11 should be (0,0,0), right ? 
> The (0,9,0) in Fig.11 just means the coordinates of 
> the point which the arrow pointed at. 
> It doesn't mean I should input (0,9,0) for Zone1's zone origin.
> [Because I'll get error message if I use (0,9,0) with WCS.]
> ========If above correct=====================
> =>Since in WCS all zone origins should be (0,0,0), when 
> will I use non-zero zone origins with WCS so it will 
> be meaningful with detailed daylighting ?
> ----Quote from Message 1345----
> [so non-zero zone origins are meaningful 
> with WCS with detailed daylighting.
> Mike]
> =============================================
> Thanks a lot,
> Ming 
> 
> 
> 
> *****The following are quoted previous discussions*****
> 
> [Message1345]
> > If WCS is used but zone origin(s) were not (0,0,0),
> > will EnergyPlus overide the zone origin(s) to (0,0,0)?
> > 
> No. When WCS is used, the surface coordinates are all with respect to
> the building origin, so non-zero zone origins have no impact on
> surface geometry. Daylighting reference points are always relative to
> the zone origin (even when WCS is used), so non-zero zone origins are
> meaningful with WCS with detailed daylighting.
> 
> Mike
> 
> > >[Message1334]
> > > To get rid of the zone origin warning, set the zone origins to
> > > (0,0,0). Changing to relative coordinates with the current zone
> > > origins would alter the geometry of the building. 
> > > 
> > > Mike
> 
> [Message1333]
> ** Warning ** World Coordinate System selected. 
> Some Zone Origins 
> are non-zero.
> ** ~~~ ** These will be used in Daylighting:Detailed 
> calculations but not in normal geometry inputs.
> 
> 
> 
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