# Re: [EnergyPlus_Support] Zone List Multiplier Problem??

```Hello Leung

Although i wont be able to address all your questions here are some reasons that are affecting the electricity and energy consumption of the 40 story building you are simulation.

1).For floors that are multiplied, connect exterior boundary conditions of the floor to the ceiling and vice versa.

2). Since exterior convection coefficients vary with elevation, locate the typical middle floor zones midheight between the lowest and highest middle floors to be modeled.

3).Shading must be identical for all multiplied floors or less accurate results may be obtained by using the zone list multiplier.

Hope this helps

Thanks

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Rahul Chillar
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Building Systems Laboratory
Mechanical Engineering Department
University of Illinois- Urbana Champaign
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Phone: Office 217-2441346
Mobile  217-7213063

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

i50330513 <50330513@xxxxxxxxxxx> wrote:
I make good use of `EnergyPlus' program to predict the energy
performance of a commercial building which is a 40-story building.

In order to reduce the amount of input of the identical floors and
have a shorter computational time, Zone List Multiplier field in the
Zone Group object are used to multiply from 1st to 38th floors.
However, after simulation of the building with this Multiplier
field, I found that the total electricity use (Electricity:Facility)
and the plant loop cooling demand of the building are much less than
that of the building without using the field of Zone List
Multiplier.

Is there any input error in the program? The Zone Group object is
shown as follows. You can see that the Zone List multiplier is set
to 38 in the 1st FLOOR. Does it mean that the 1st FLOOR is
multiplied by 38? If yes, why the total electricity and the cooling
loads are much less than that of the building without the use of
Zone List multiplier field.

---------------------------------------------------------
ZONE GROUP,
GF FLOOR, !- Zone Group Name
GF FLOOR LIST, !- Zone List Name
1; !- Zone List Multiplier

ZONE GROUP,
1st FLOOR, !- Zone Group Name
1st FLOOR LIST, !- Zone List Name
38; !- Zone List Multiplier

ZONE GROUP,
RF FLOOR, !- Zone Group Name
RF LIST, !- Zone List Name
1; !- Zone List Multiplier
---------------------------------------------------------

I hope you make some recommendation for me. Thanks for your
attention.

Leung

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