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RE: [EnergyPlus_Support] Setpoint temperatures not achieved in space
Expanding on my earlier suggestion�
·�������� Do you know the heating coil inlet node temperature? (i.e., is the water hot? Is the boiler operating properly? Is the pump operating? If this is a gas heating coil, what is the energy rate?)
·�������� What is the airflow for the air loop fan which serves the theater? (i.e., is the fan actually on? Delivering proper airflow?)
·�������� All of these can be reported as output variables and will reveal clues regarding the source of your problem.
From: Celia King-Scott [mailto:celiakingscott@xxxxxxxxx]
Sent: Thursday, January 17, 2013 12:08 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx; Jim Dirkes
Subject: Re: [EnergyPlus_Support] Setpoint temperatures not achieved in space
Jim,
Thank you for your response. It does look like the heating is working as I have set the AHU's availability schedule as 'alwayson' and the setpoint schedule as 24/7.
The AHU demand side inlet temperature is equal to the AHU Supply Side Outlet temperature but is incredibly low around 25F. However the AHU Extract Fan Air Outlet temperature (which I am assuming is the return air ??) is reasonable and what you would expect for that space. I just don't understand what is going on at the supply air side to be providing such low temperatures as 20-25F when the setpoint says otherwise.
If you have any other ideas on this please forward my way. I may send my model into help as I am running out of ideas (and time).
Thanks again!
Celia
From: Jim Dirkes <<mailto:jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>jim@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: "<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx" <<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Thursday, January 17, 2013 6:00 AM
Subject: RE: [EnergyPlus_Support] Setpoint temperatures not achieved in space
Celia,
It sounds as though the simulation’s heating system is not even operating�.
Have you confirmed that the system is actually delivering hot air / water when it should?� (Normally you would add Output variables for the air loop to confirm this (discharge node, mixed air node, etc.)
From: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx [<mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Celia King-Scott
Sent: Wednesday, January 16, 2013 4:20 PM
To: <mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx>EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Setpoint temperatures not achieved in space
Hi all,
I am modeling a performing art/theater building in Eplus. I am trying to calibrate the simulation to the metered data and therefore am looking at the run period of 12/25 - 12/31 when there is no occupancy and minimal internal loads. However AC system is still running 24/7 (shocking I know). The building is located in CO so during this period the outdoor dry bulb is 17F - 25F. My heating setpoint in the space (AHU with VAV reheat boxes) is 70F. However the zone mean temperatures in the ballroom space is 22F (bascially 5F above outdoor at all times) so obviously the set point is not being met.
I have ramped up the fans and heating coil capacities but am still seeing these extremely low temperatures. I've also tried turning off the OA but the zone temperatures are remaining the same. The only thing that seems to change these temperatures is if i increase the internal load in the space or change the weather file. How can I increase these zone temperatures in the space so that the system is meeting the setpoints without changing the internal load.
I am really baffled by what is going on here and would appreciate any help if possible.
Thank you for your time,
Celia
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