RE: [EnergyPlus_Support] electric power (watts) of PTAC

[YuanLu Li <yli006@xxxxxxxxxxx>]

Hi, Hu Jia

I point out the Schedule Always 4 to you, because in the error file, it is in the ophan  object warning.  The Fan:OnOFF is always one.  But in your .xls you send earilier seemed to have the zero in the schedule.  Zero is constant flow, one is on/off auto.  Therefore, the two schedules are opposing each other.

The ground temperature was also in your error file warning.  I tried changing it, and it added about one watt to the fan power.  I know that the efficiency value is included, because when I reduced the efficiency from 0.7 to 0.5 the fan power increases.

The other PTAC model in the example file is a 3Zone building in Miami.  The fan power for the 6m x 6m West Zone was sized to 90 watts. Those zones without any windows are a lot lower.  In this model, the template objects were not used.  All the sizing objects were present and no .expidf was generated.  There were only one warning on the weather file location data.

I have a feeling that the 5Zone template was not correctly expanded for sizing, and therefore generated those warnings.  I have not solve the problem yet.

I do not have any EPlus project of my own and am doing this as my hobby.  So long you think my comments are useful, I shall pick up some of your questions.

 Dr. Li  



To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: hujia06@xxxxxxxxx
Date: Mon, 23 Nov 2009 15:11:35 -0500
Subject: Re: [EnergyPlus_Support] electric power (watts) of PTAC


 I quite appreciate your help.  I see the expidf and find the objects you mentioned. At first, I did not use the template model (PTAC) and used the schedule "Always 4". But when using the template model, I did not delete this schedule because I think it will not affect my the result. 

For the angle of the window blind, I define it deliberately to see the effect. I will look at what will happen when changing the ground temperate.