[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] Re: AHU with plate heat exchanger and no mixing box, possible?

Dear James,

Thanks for you repaly.
The problem is that I need the contrary: 100% fresh air system, for this reason I tried to impose the fresh air fraction =1 but then I get the following:

 ** Warning ** HeatExchanger:AirToAir:SensibleAndLatent "OA HEAT RECOVERY
> 1": Average air volume flow rate is <50% or >130% warning continues. Air
> flow rate ratio statistics follow.
> > 
> > ** Warning ** HeatExchanger:AirToAir:SensibleAndLatent "OA HEAT RECOVERY
> 1": Unbalanced air volume flow ratio exceeds 2:1 warning continues. HX flow
> ratio statistics follow.


Thanks in advance for any further help,

Andrea


--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "James V Dirkes II, PE" <jim@...> wrote:
>
> Dear Andrea,
> 
>  
> 
> How about adding an outdoor air controller and mixing box, but set outdoor
> air for zero at all times. ("Maximum outdoor air flow rate" = 0)
> 
>  
> 
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP, BEMP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
> 
>  
> 
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx
> [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of
> andreacostaenergyplus
> Sent: Thursday, April 21, 2011 9:35 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] Re: AHU with plate heat exchanger and no
> mixing box, possible?
> 
>  
> 
>   
> 
> Hi all,
> 
> Would anybody be able to give be an help on the issue below?
> 
> Many thanks in advance,
> 
> Andrea
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> <mailto:EnergyPlus_Support%40yahoogroups.com> , "andreacostaenergyplus"
> <andreacostaenergyplus@> wrote:
> >
> > Dear All,
> > 
> > I am modelling an AHU with a plate heat exchanger an no mixing box.
> > It seems that this is not possible in E+ and that I must have an
> OutdoorAir:Mixer object in the AirLoopHVAC:OutdoorAirSystem:EquipmentList.
> > Can anybody confirm this limitation?
> > This is the error that I get:
> > 
> > ** Severe ** OutdoorAir:Mixer for AirLoopHVAC:OutdoorAirSystem
> AHU1_OUTDOOR_AIR_SYSTEM not found.
> > ** Fatal ** GetAirPathData: Errors found getting AirLoopHVAC
> > 
> > 
> > 
> > I tried a workaround, having the OutdoorAir:Mixer and imposing a Minimum
> Fraction of Outdoor Air Schedule constanly equal to 1.
> > But this lead to the follwoing warnings:
> > 
> > ** Warning ** HeatExchanger:AirToAir:SensibleAndLatent "OA HEAT RECOVERY
> 1": Average air volume flow rate is <50% or >130% warning continues. Air
> flow rate ratio statistics follow.
> > 
> > ** Warning ** HeatExchanger:AirToAir:SensibleAndLatent "OA HEAT RECOVERY
> 1": Unbalanced air volume flow ratio exceeds 2:1 warning continues. HX flow
> ratio statistics follow.
> > 
> > Is there any better solution to this issue?
> > I would kindly appreciate anyone's help on this.
> > Kind regards,
> > Andrea
> >
>




------------------------------------

Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The primary EnergyPlus web site is found at:
http://www.energyplus.gov

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/





=======
Email scanned by PC Tools - No viruses or spyware found.
(Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17360)
http://www.pctools.com/
=======