[EnergyPlus_Support] Re: heat exchanger:Air to air: general

["donbshireyiii" <shirey@xxxxxxxxxxxx>]

Please upload your idf file to the EnergyPlus yahoogroups web site
(http://groups.yahoo.com/group/EnergyPlus_Support/) or send it
EnergyPlus-Support@xxxxxxxx and we'll take a quick look at it.

If the temperature of the relief air is greater than the temperature
of the incoming outdoor ventilation air, then you will see a positive
value.

What weather file are you using?

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Joseph Lewis
<fortierengineer@y...> wrote:
> Hello,
>  
> I have a heat exchanger:air to air:general in a model that only
transfers sensible heat between the relief airflow and the outdoor air
flow.  Running it in the summer design day, I have discovered that no
matter what control strategy for the out door air system, there are
hours where the "Heat Exchanger Sensible Heating Rate" is positive.  I
have looked at the  HVACStandAloneERV_Economizer.idf example for help,
 and it has the same issue.   I have also looked at DesiccantCVRh.idf
and in this file the sensible heating rate is zero for the summer, 
but if I remove the desiccant unit from the loop you have the same
issue.  
>  
> Is there a control strategy that can be used along with an outdoor
air controller (with economizer) to eliminate this? 
>  
> Thank you,
>  
> Joe Lewis



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