RE: [EnergyPlus_Support] Autosizing issue

["Griffith, Brent" <brent_griffith@xxxxxxxx>]

Operative temperature is a mix of zone air temperature and zone surface
temperatures. If zone air temperatures are meeting setpoint, then you
should look at the results for mean radiant temperature and the
temperature results for the inside face of surfaces.  If you have some
large windows, then they could be getting hot when in direct sun and
will cause operative temperature to be quite high.  

 

If you are concerned about meeting operative temperatures rather than
air temperatures, then you can use operative temperature-based
thermostatic control.  Systems usually autosize to be larger with Op
temp control. 

 

 

 

________________________________

From: EnergyPlus_Support@xxxxxxxxxxxxxxx
[mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Zhen Tian
Sent: Tuesday, November 14, 2006 3:47 PM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [EnergyPlus_Support] Autosizing issue

 

Dear all,

I expeienced an issue today about the autosizing. I use autosizing for
system , equipment and plant. The setpoint air temperature for cooling
is 24C and 22C for heating. I use a VAV system serving five zones.

WhenI use autosizing for humid areas like Portland, Atlanta. The
simulted indoor operative temperature for perimeter zones are well
within 25-26C. When I just change the weather file and design day file
for dry climates like Helena, El Paso, I found the indoor operative
temperaure in perimter zones may reach 28-30.

I dont know what may be the reasons causing this problem. Could somebody
give me some explanation?

Thank a lot in advance.

Best regards,

Zhen Tian



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