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Re: [EnergyPlus_Support] Wrong Calculations EnergyPlus


Hello Linda,

thank you very much for taking the time to look this issue for me, I understood about the duplicated surfaced problem and already corrected it.

About the second issue, you wrote me

 ...direct you  to looking at Ground Heat Transfer (in the Auxiliary Programs document) 
and to make sure that your floor in the raised building (if I'm 
understanding what you are saying) has Outdoors as the boundary 
condition but, likely, will not be Sun Exposed. It would be exposed to 
wind.

This is exactly what I did and thats why I am so confused about it. Could you please take a look into the files I sent you? I would really appreciate that, I can´t figure out what´s the problem and been stuck on this for a lonf time.

Will be waiting for your reply, thank you once again.

Regards,

Paulo Reis

On Sunday, April 6, 2014 5:55 PM, Linda Lawrie <linda@xxxxxxxxxxxxxx> wrote:

I'm going to assume this is what you "deleted":
BuildingSurface:Detailed,
TETOZO, !- Name
Ceiling, !- Surface Type
Internal Ceiling, !- Construction Name
zonaocupada, !- Zone Name
Zone, !- Outside Boundary Condition
ATICO, !- Outside Boundary Condition Object

that is, you deleted a similar surface in the ATICO zone.

Read about this object -- when you use Zone as the Outside Boundary
Condition -- the program automatically creates the surface in that zone
to affect the interzone heat transfer.

Which is also why I directed you to look at the output (in the .eio
file) of the Output:Surfaces:List,Details report. You should have seen
duplicate surfaces in the zones for this object.

I cannot answer your other questions at this time except to direct you
to looking at Ground Heat Transfer (in the Auxiliary Programs document)
and to make sure that your floor in the raised building (if I'm
understanding what you are saying) has Outdoors as the boundary
condition but, likely, will not be Sun Exposed. It would be exposed to
wind.

I may have time to look in detail at your files later but equally
someone else on the helpdesk may as well.

On 2014-04-06 14:46, PAULO REIS wrote:
> Dear Linda,
>
> first of all thank you very much for your attention, I appreciate very
> much your help and tried to follow your advice.
>
> I cancelled one interzone partition, it solved the area and volume
> calculations but according to my understanding input that surface data
> was necessary for the correct configuration. Could you please tell me
> why the surface data cannot be included?
>
> My research is an Academic work that tries to demonstrate that a house
> built in direct contact with the ground consumes less energy for
> climatization purposes than a house that was built over pilotis
> (elevated from the ground).
>
> My perplexity was to see that the Energy Plus output data indicated
> the opposite for heating, but for cooling the results indicated the
> necessity to use more than double of energy, wich I believe is too
> much.
>
> I built 2 models with SketchUp, the difference between them is only
> the position in relate to the ground. The one named CASATERREA.IDF is
> on the ground, the one named CASAPILOTIS.IDF is 2,7m above the ground.
>
> I used the SWERA weather files of Brasilia (Brazil).
>
> I believe there is a mistake of input but I am not capable of
> understand wich mistake I am doing. Since you have a very good
> knowledge with this program maybe for you it`s very simple to just
> take a fast look and realize what I am doing wrong, I am sending you
> the files attached and would be very pleased if you could give me your
> thoughts on this issue.
>
> The files attached are CASATERREA.IDF and CASAPILOTIS.IDF
>
> Thank you, will be waiting for your reply
>
> Best Regards,
>
> Paulo Reis
>
> On Thursday, April 3, 2014 5:04 PM, Linda Lawrie
> <linda@xxxxxxxxxxxxxx> wrote:
>
> Look at the Output:Surfaces:List,Details report. It's most likely
> that you taggest something as an interzone partition and it got
> entered twice. EnergyPlus does not make incorrect calculations on
> those simple buildings -- look at the 1zoneuncontrolled example file,
> for example.
>
> If you can't figure it out, attach it here or send it to the
> helpdesk.
>
> At 09:01 AM 4/3/2014, PAULO REIS wrote:
>
>> Hello Guys!
>>
>> I'm new to using EnergyPlus, and a simple simulation I checked some
>> inconsistencies.
>> Looking checked the grounds that the EnergyPlus made
>> ��some wrong calculaulations, for example, a thermal area
>> with 10 x 10 x 2.7 m, where the volume is 270 m3 , provides the
>> program 360 m3 . A second region with an area of ���134
>> m2 to 234 m2 provides EnergyPlus (added to the preceding which was
>> 100 m2 ?), But the total sum of these two areas the program provided
>> 334 m2.
>
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Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

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