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Re: [EnergyPlus_Support] heating and cooling load



Hi, Richard,
 
Thanks for your reply. I uploaded the input file again at URL: http://f1.grp.yahoofs.com/v1/4Aq7SnR5Z0M2nuhWCS7p0mfuMtcYKHHntazQLS5kKeVYF4_YIJGDUNrC15nWWQlSdhnXhM9rp971ZzlQ_eF63Sp_FYc-KPk/_Problem_Submittals/heating%20and%20cooling%20loads.zip
 
In this folder, there is a excel file, from which you can see in Zone/Sys Sensible Heating Rate [W], Zone/Sys Sensible Load Predicted [W], Packaged Terminal Air Conditioner Sensible Zone Heating Rate[W] are different in Row 809, 810.  At this time, the fan should be on, that is why the Packaged Terminal Air Conditioner Sensible Zone Heating Rate is not 0, but I am confused with the Zone/Sys Sensible Heating Rate [W]. Could you explain the relation of this variable with Packaged Terminal Air Conditioner Sensible Zone Heating Rate[W]? Only PTAC is used, should they be equal?
 
Thank you.

2009/9/23 Richard Raustad <RRaustad@xxxxxxxxxxxx>
 

If the PTAC fan is moving air, the Packaged Terminal Air Conditioner
Sensible Zone Heating Rate should not be 0. Check the fan operating mode
(constant fan or auto fan) and also check to see what the zone
temperature is with respect to the zone temperature set point.



Hu Jia wrote:
>
>
> Hello, everyone:
>
> I want to simulate the heating and cooling loads of an office to see
> how the window blinds affect the heating or cooling loads. I choose a
> PTAC (Packaged Terminal Air Conditioner) in the HVAC
> Templates:Zone:PTAC object. For Thermostatsetpoint:Dual point is 24
> and 20, respectively.
>
> In the ouput file, I select some variables related to heating and
> cooling loads, for example, Zone/Sys Sensible Heating Rate [W],
> :Zone/Sys Sensible Load Predicted [W], Packaged Terminal Air
> Conditioner Sensible Zone Heating Rate[W]. From the manual document,
> because only PTAC is used in the zone, I initially think that the
> three should be equal.
>
> But for some days, Zone/Sys Sensible Load Predicted [W] is 0, and
> Packaged Terminal Air Conditioner Sensible Zone Heating Rate[W] is
> 9.525853, which is not equal to Zone/Sys Sensible Heating Rate [W].
>
> Can anyone explain the relationship of the three variables for me?
>
> Thank you.
>
>

--
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL 32922-5703
Phone: (321) 638-1454
Fax: (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years




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