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[EnergyPlus_Support] Re: Too many vertices
I mentioned the pmv e pdd because when the temperature was not regulated, the values from them was out of range for confort of the the people, obviously. Our goal mostly is to simulate the same building and see what is the thermic load in kWh that the bulding needs, because students are complaing about how hot is there sometimes.
When the thermostat start the "kick in", the pmv and ppd began to stay at that certain range -1<pmv<1, pdd<10. Witch is great, but if you make the graphics you will see that the temperature e these coefficients seems to follow the occupaion schedule. May be a missleading information, i dont know.
Is it a easy way to trasnform my thermostat witch is type 4 (cooling and heating with deadband) to type 2?
because the way that the simualtion was built, the thermostat dosent follow any schedule, just a setpoint in C for cooling and heating. It is an object on Hvac template.
Can i make a schedule either way?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@...> wrote:
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> I did not know that you are in such a rush. The building geometry is fine. Just let your professor know, that the calculation of shade has many different algorithms. The warning simply let you know that some of the reflections may not be calculated. As these reflections are all outside the building, it will not affect the building heat load very much. All you need to watch is that the solar beam direct component is excluded using the window shades. The beam value for each window can be displayed in your .csv. "too many vertices" may also be produce by some third party software. This can be ignored, if they are all for the external shades. Those I have looked at are all with 4 vertices. One reason is the use of the long decimal numbers in the data entry. The third party software adds extra small areas between the shade and the window or wall. If this is the case, you may declare the shades as detached shades and remove these small area. Heating load is zero is a warning to you so that you need not provide heating in the system. As your thermostat is Type 4, and heating equipment is available, the warnings are given. With type 4 thermostat control, the equipment is left on all the time so that the transiion period may have both heating and cooling. This is done using the availability schedule. The thermostat is the temperature schedule. The Thermostat heating and cooling are controlled by the two band values. The dead band makes sure that the heating and cooling would not come on at the same time. If you remove the heating equipment for the x and y zones, the warning should disappear. You may also need to change the thermostat type to type 2 for cooling only. Because you are using templates for input, this may cause a problem in the entry. It is simpler to ignore the warning and provide a reason. The internal load usually increases the zone temperature making the heating not necessary and therefore the no heating load warning. If you remove the people, lights, etc. the warning may disappear. This is just to show that the warnings are good and not performance or design errors. PMV, PPD's are all post-processing according to the comfort rules. If you use natural ventilation and in tropical countries, they do not have much meaning. Dr. Li
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> From: barth.poker@...
> Date: Wed, 4 Jul 2012 18:38:41 +0000
> Subject: [EnergyPlus_Support] Re: Too many vertices
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> Hi Dr. Li
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> I have just now read your email..
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> Im not quite sure but, as you say when that schedule turns 0 or "Cycling" it seems that it turns on right in time as the Ocupation Schedule. Because the temperature is controled when have people inside the envelope, and the coefficients pmv and ppd follow that in the graphics.
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> So, i decide that it works for me that way, so i did not change anything yet.
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> But, im giving this to my professor as an research job, and i wanted to closed this 3 warnings that remains.
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> 2 of that says that heat loads of X and Y zones are zero. (witch i expected)
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> and 1 of them is this one of too many vertices.
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> I still didnt figured out how to exclude that, only by deleting the faces.
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> I wish i could just fixed that 3 warnings.
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> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, YuanLu Li <yli006@> wrote:
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> > Hi, Douglas and Linda I ran his IDF using DD sizing and the error file is attached. The external shading are for window boxes. I think, the warnings can be ignored. The vertical fins are very close between windows. Only the adjacent ones overlap. There is one box for each window. The total number is quite large.
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> > Because the Winter is mild, the heating was not required for some zones. Therefore, the warning can also be ignored. The error reporting seems to be different for tha weather file and sizing simulation. The warnings are summarized in my error file rather than listed one at a time. "DoNotMirrorDetachedShading, " was suggested in an earlier error file, and I have this included in the IDF Diagnostic object. I have sent the IDF I used to Douglas. He also had a question on Fan mode schedule. I have not yet heard from him on the detailed change he made. The compact schedule for fan mode was the as as that for other equipment. 0 for night time and 1 for day time. I told him that the mode and on/off may not be the same, but should not stop the system frm running. Dr. Li
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> > To: EnergyPlus_Support@xxxxxxxxxxxxxxx
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> > From: linda@
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> > Date: Wed, 4 Jul 2012 08:39:25 -0600
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> > Subject: Re: [EnergyPlus_Support] Too many vertices
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> > What does your ShadowCalculation object look like?
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> > The 2nd field in that object sets the number of figures in a shadow
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> > overlap but maybe this is a different detection.
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> > Feel free to send your input file to the helpdesk for further analysis or
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> > alleviation of this warning, if possible.
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> > At 08:31 AM 7/4/2012, barth.poker wrote:
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> > Hi guys, my simulation was
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> > giving and overlapping shadow warnings wicth i corrected.
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> > But, Now is displaying this warning:
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> > "Too many vertices [>=12] in a shadow overlap"
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> > and then it told me to run the ExtraWarnings for more
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> > information
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> > and this came up:
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> > " ** Warning ** Too many vertices [>=12] in a shadow overlap
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> > ** ~~~ ** Overlapping figure=3965AF,
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> > Surface Class=[Detached Shading:Building]
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> > occurred 1 times.
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> > Overlapped=79BA0A, Surface Class=[Detached Shading:Building]
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> > *************
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> > ** Warning ** Too many vertices [>=12] in a shadow
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> > overlap
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> > ** ~~~ ** Overlapping figure=E7C01A,
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> > Surface Class=[Detached Shading:Building]
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> > ** ~~~ ** This error
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> > occurred 1 times.
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> > Overlapped=4F4431, Surface Class=[Detached Shading:Building]
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> > *************
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> > ** Warning ** Too many vertices [>=12] in a shadow
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> > overlap
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> > ** ~~~ ** Overlapping figure=E3C3A1,
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> > Surface Class=[Detached Shading:Building]
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> > ** ~~~ ** This error
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> > occurred 1 times.
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> > ** ~~~ ** Figure being
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> > Overlapped=D611AE, Surface Class=[Detached Shading:Building]
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> > *************
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> > ** Warning ** Too many vertices [>=12] in a shadow
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> > overlap
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> > ** ~~~ ** Overlapping figure=E942EA,
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> > Surface Class=[Detached Shading:Building]
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> > ** ~~~ ** This error
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> > occurred 1 times.
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> > ** ~~~ ** Figure being
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> > Overlapped=E21B91, Surface Class=[Detached Shading:Building]
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> > *************
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> > ** Warning ** Too many vertices [>=12] in a shadow
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> > overlap
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> > ** ~~~ ** Overlapping figure=5578E7,
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> > Surface Class=[Detached Shading:Building]
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> > ** ~~~ ** This error
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> > occurred 1 times.
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> > ** ~~~ ** Figure being
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> > Overlapped=3534EE, Surface Class=[Detached Shading:Building]
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> > *************
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> > ** Warning ** Too many vertices [>=12] in a shadow
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> > overlap
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> > ** ~~~ ** Overlapping figure=376846,
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> > Surface Class=[Detached Shading:Building]
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> > ** ~~~ ** This error
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> > occurred 1 times.
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> > ** ~~~ ** Figure being
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> > Overlapped=79BA0A, Surface Class=[Detached
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> > Shading:Building]"
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> > and i looked the shd file and it seems that is nothing i can do about
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> > it
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> > Is a solution for this? Or some way the i could ignore this
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> > warning?
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