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Re: [EnergyPlus_Support] about node temperatures


Hi, Mike:
 
Thanks for you reply. I have checked the pump input. Actually, I do use variable flow pumps with constant pump power.  But I cannot change rated pump power consumption to "autosize" as this will cause severe errors. I did not use any autosize function in my model.  I have upload my model named " ICT-NoRC-zt.zip " to the yahoo group. Could you check it for me? Thanks a lot. The weather file is Calgary, Alberta.
 
Regards,
 
Zhen 
"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
My guess is that there is something wrong with the pump inputs.  Is this a 
variable flow system with constant pump power?  Look at the pump inlet and 
outlet temperatures, flow rate and pump electric power consumption.  This my 
reveal the problem.

Mike


On 13 Jan 2005, at 16:09, zhen tian wrote:

> 
> 
> Hi everyone:
> 
> I am simulating a building with five zones serviced by a VAV system. I set up
> the heating plant (purchased heating) temperature as 93 degree C.  The
> simulation goes through well, but when I check the system node temperature, I
> found that the "HW SUPPLY OUTLET NODE:System Node Temp[C](Hourly)" the
> temperature sometimes are " 93, 93, 111.1, 1111.4, 93.2, 93.2, 3533.6...."
> 
> And even the "CW PUMP OUTLET NODE:System Node Temp[C](Hourly) " is like this: "
> 1369.2, 2723.5, 11.7, 10.8, 1783.1..."
> 
> when I run the simulation in a typical summer day.
> 
> Could somebody tell me what is the problem?
> 
> Regards,
> 
> Zhen
> 
> 
> 
> 
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> 



========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx




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