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Re: [EnergyPlus_Support] Problem with low heting values from e+

- That would be a Good design for a zero energy building--

Jeremiah D. Crossett
CleanTech Analytics

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On Mon, Jul 30, 2012 at 12:25 PM, kostas ordoumpozanis <ordoumpozanis@xxxxxxxxx> wrote:

Dear Users,
I think I found it. the heating loads are so low due to the double insulation and the low-e windows.  I changed the construction to the typical standard of Greece and I got a 90 kWh/m2 for heating witch is logical for a medium insulated house in Greece. So I thing that if this is correct then the low values should be equally correct.
best regard

From: kostas ordoumpozanis <ordoumpozanis@xxxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Monday, July 30, 2012 9:32 PM

Subject: Re: [EnergyPlus_Support] Problem with low heting values from e+

Dear Dr Li! yes i do have the e+ v6 file.
the only difference for this file is the multi core field and the minimum iterations on  building field (that have been removed from v7 file to be able to run it one the v6).

This building is not a real one case. it is the base of a modelling concept so that's why it is in this simple form for the moment. 
The weird in this file is that in one zone there are no heating loads for winter months. this is unrealistic the B,C,D and E climate zones of Greece.
I tried to give a very big infiltration rate 3 ach just to test it but still the same problem.
I made some test without internal gains, without windows, without heating systems just to see the temperatures, I remover the insulation and still the house does not give realistic results.
hank you for your time
Dear Jeremiah
        This are good modifications but i have to find the problem on the simple model at the moment so to be able to understand the reason of such a behavior. As for the v6 version it gives about the same results.
Thank you for your time
 Best regards

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Monday, July 30, 2012 7:25 PM
Subject: RE: [EnergyPlus_Support] Problem with low heting values from e+

Do you still have the IDF in Version 6.0?  I know that the input format has change for many objects in version 7.10.  Just curious.
The number I gave you was for one floor.  Two floors together would be about 3.0 kw for heating or cooling.
It is not very practical to use a single zone building for solar related  study.   Monthly report is also not very suitable to find simulation problems.

 Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Sun, 29 Jul 2012 14:42:31 -0700
Subject: Re: [EnergyPlus_Support] Problem with low heting values from e+

Dear Dr. Li

    Thank you for your answer. I agree with your results but a house as this one in Greece is expected to have mach more heating capacity   from the calculated (5-8 kW system).In other buildings simulation (but in version 6 of e+) I had no problems with the results but in this one I cannot accept so low heating capacity as a correct values. I have discussed this problem with some other e+ users in Greece and they had the same problem but could not find the reason.

So I'm looking either an error of mine or something that I could not find at this stage.

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Sunday, July 29, 2012 10:10 PM
Subject: RE: [EnergyPlus_Support] Problem with low heting values from e+

I did not look at the IDF in detail.  The simmulation with the DesignDay objects added was error free.
The summary report showed the floor area as 72 m2.  The heating and cooling rates were around  1.5 kw for the Winter and SUmmer design days..  These capacity can be met with a portable unit.
You were using annual simulation, and the result simply means that you may  not need HVAC system.

 Dr. Li  


To: EnergyPlus_Support@xxxxxxxxxxxxxxx
CC: kontante@xxxxxxxxxxx
From: ordoumpozanis@xxxxxxxxx
Date: Sun, 29 Jul 2012 09:16:04 -0700
Subject: [EnergyPlus_Support] Problem with low heting values from e+

Dear E+ users
    I am having problem to understand why e+ gives very low heating values to the attached model.
It's a simple 2floor domestic house with an ideal system and some classic internal load (people, lights, equipment) and an infiltration.
The results give a value of 0.07 kWh/m2 witch is not realistic. I have checked the internal load, I have changed a climate files but still cannot get realistic values.
The only thing that I can imagine is the thermal mass but I have checked the material properties as well could you suggest any other parameter that I might have not check, or if you had a similar problem to propose me a solution

Thank you in regards




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