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Re: [EnergyPlus_Support] Warnings
Dear Mike,
I verified the hvac configuration and controls in my idf file to find out if there are any mistakes. I also made some changes in my idf file, but nothing could erase the "sim airloops maximum iteration "warnings(about 100). I have uploded my idf file in problem_submittals in a folder. The name of the folder is "kiran".
Can you please verify the mistake in my idf file which leads to so many warnings?
thanks,
kiran
"Michael J. Witte" <mjwitte@xxxxxxxx> wrote:
In some cases these warnings can be ignored, but only if you are sure that the
boundary conditions on the opposite sides of interzone surfaces are conserving
energy. If you are uncertain about that, it is best to eliminate these
warnings. If the top and bottom floors of the building are being conditioned
to the same thermostat setpoints as the multiplied middle floors, then I would
recommend making the floor and ceiling of the middle floor zones adiabatic
rather than interzone.
Max iteration warnings indicate a problem with the HVAC system configuration or
controls. A small number of these can be acceptable, but 100s of them are not.
Mike
On 7 Sep 2006 at 3:51, kir kumar wrote:
> Dear Mike,
> I simulated a building with seven stories, each floor with two zones. I
> initially built a 3-storey building using EpQuick and after converting into
> energy plus idf file, I used zone list multiplier to multiply middle floor 5
> times before starting the simulation. I ended up getting many warnings and I
> copy pasted some of them.
> ** Warning ** GetSurfaceData: InterZone Surface Areas do not match as
> expected and might not satisfy conservation of energy:
> ** ~~~ ** Area=680.0, Multipliers=1, Total Area=680.0 in
> Surface=FLOOR_LOWER_ZONE_A_B_C_F_MIDDLE_ZONE_A_B_C_F Zone=LOWER_ZONE_A_B_C_F
> ** ~~~ ** Area=680.0, Multipliers=5, Total Area=3400.0 in
> Surface=FLOOR_MIDDLE_ZONE_A_B_C_F_LOWER_ZONE_A_B_C_F
> Zone=MIDDLE_ZONE_A_B_C_F
> ** Warning ** GetSurfaceData: InterZone Surface Areas do not match as
> expected and might not satisfy conservation of energy:
> ** ~~~ ** Area=680.0, Multipliers=1, Total Area=680.0 in
> Surface=FLOOR_LOWER_ZONE_F_C_D_E_MIDDLE_ZONE_F_C_D_E Zone=LOWER_ZONE_F_C_D_E
> ** ~~~ ** Area=680.0, Multipliers=5, Total Area=3400.0 in
> Surface=FLOOR_MIDDLE_ZONE_F_C_D_E_LOWER_ZONE_F_C_D_E
> Zone=MIDDLE_ZONE_F_C_D_E
> ** Warning ** GetSurfaceData: InterZone Surface Areas do not match as
> expected and might not satisfy conservation of energy:
> ** ~~~ ** Area=680.0, Multipliers=5, Total Area=3400.0 in
> Surface=FLOOR_MIDDLE_ZONE_A_B_C_F_TOP_ZONE_A_B_C_F Zone=MIDDLE_ZONE_A_B_C_F
> ** ~~~ ** Area=680.0, Multipliers=1, Total Area=680.0 in
> Surface=FLOOR_TOP_ZONE_A_B_C_F_MIDDLE_ZONE_A_B_C_F Zone=TOP_ZONE_A_B_C_F
> ** Warning ** GetSurfaceData: InterZone Surface Areas do not match as
> expected and might not satisfy conservation of energy:
> ** ~~~ ** Area=680.0, Multipliers=5, Total Area=3400.0 in
> Surface=FLOOR_MIDDLE_ZONE_F_C_D_E_TOP_ZONE_F_C_D_E Zone=MIDDLE_ZONE_F_C_D_E
> ** ~~~ ** Area=680.0, Multipliers=1, Total Area=680.0 in
> Surface=FLOOR_TOP_ZONE_F_C_D_E_MIDDLE_ZONE_F_C_D_E Zone=TOP_ZONE_F_C_D_E
> Now my question is that "Are these above warnings worth considering?"
> Are these above warnings suggest that there is something wrong with my idf
> file?
>
>
> The warning bellow suggests that maximum iterations exceeded for a
> purticular air handling unit(AHU_ABCF MZ) and this same warning was there for
> each of all the 14 air handling units. I copy pasted just one of them for
> brevity.Now my question is "Is this warning bellow worth considering? Is this
> warning bellow suggest that there is something wrong with my idf file?
> ** Warning ** SimAirLoops: Maximum iterations (50) exceeded for AHU_ABCF
> MZ, at FAYETTEVILLE/DRAKE AP AR USA TMY2-72344 WMO#=-, 08/22 08:30 - 08:45
> Can any one please answere my questions?
> Thanks in advance,
> kiran
>
>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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