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[EnergyPlus_Support] Loop delta Temp
Hi, Mike:
As you suggested, I checked the model "VAVSingleDuctReheatBaseboard.idf".
But I found that the temperature of 6.67C is set for the chilled water supply temperature, not the loop DeltaT. Am I right?
Could you tell me where can I set the chilled water and hot water loop DeltaT?
I guess I can set these DeltaT in the field of Plant Loop by setting Maximum and Minimum loop temperature. But I found that in examples, these DeltaT is quite big. For chilled water loop, it is ranged from 1degree C to 98 degree C. Can I set a reasonable Delta T in this filed?
Thanks a lot.
Regards,
Zhen
"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
The temperature rise across the loop will depend on how you have sized the flow
rate vs. load in the coils. Many (all?) of the example files use a 6.67C loop
DeltaT.
Mike
On 17 Jan 2005, at 17:17, zhen tian wrote:
>
> Hi, Mike:
>
> I changed the Pump cofficeints to "0, 1, 0, 0" and now the "HW PUMP OUTLET
> NODE:System Node Temp[C](Hourly) " and the "CW PUMP OUTLET NODE:System Node
> Temp[C](Hourly) " are kept at 93 degree C and 5C, and accords well to the set
> temperatures.
>
> But I checked the CW SUPPLY INLET NODE TEMP and CW PUMP OULET NODE TEMP, I still
> get some temperatures like these: "5, 5, 5.5, 10.9, 15.4..." which are close to
> the set temperatures, are these temperatures sound normal?
>
> Thanks a lot.
>
> Regards,
>
> Zhen
>
>
>
> "Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
> If the pump power remains constant and the flow varies, low flows will get hot
> because the energy must go somewhere. You either need to let the pump power
> vary (linear power would use coefficients of 0,1,0,0) or use a constant speed
> pump so the excess flow will go through the bypass.
>
> Mike
>
> On 14 Jan 2005, at 16:39, zhen tian wrote:
>
> >
> > 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
>
>
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