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RE: [EnergyPlus_Support] A question about Zone List Multiplier
Max iteration errors tend to occur more often in systems with large flow rates.
Decreasing controller tolerances should help eliminate these. If you are
using CONTROLLER:SIMPLE, try setting the "Controller Convergence Tolerance" to
"autosize". For other equipment, such as SINGLE DUCT:VAV:REHEAT, set the
"Convergence Tolerance" to be much smaller, 0.0001 for example.
Mike
On 27 Jan 2005, at 16:31, Mahabir Bhandari wrote:
>
>
> Mike,
>
> I was using Zone list multiplier (for a 6 story building - I created 3
> floors and used the multiplier for middle floors) with Autosize option. I
> get the following warning messages. How can I get rid of these warning
> messages or in other words how does it affect the accuracy of results? When I
> created a 3 floor building i.e. without multipliers and associated changes, then
> there were no warnings.
>
> ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops, at
> SAN_FRANCISCO CA USA TMY2-23234 WMO#=724940, 01/14 10:59 - 11:00
> ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops, at
> SAN_FRANCISCO CA USA TMY2-23234 WMO#=724940, 01/14 11:13 - 11:14
> ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops, at
> SAN_FRANCISCO CA USA TMY2-23234 WMO#=724940, 01/14 11:45 - 11:46
> ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops, at
> SAN_FRANCISCO CA USA TMY2-23234 WMO#=724940, 01/14 15:26 - 15:28
> ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC loops, at
>
>
> .....
>
> Thanks
>
> Mahabir
>
> -----Original Message-----
> From: Michael J. Witte [mailto:mjwitte@xxxxxxxx]
> Sent: Wednesday, January 26, 2005 2:40 PM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: Re: [EnergyPlus_Support] A question about Zone Lise Multiplier
>
>
> Yes. Zone Multiplier and Zone List Multiplier are applied to zone level
> loads.
> All HVAC equipment serving a multiplied zone must have increased capacities
>
> and flow rates to serve the multiplied load, even zone equipment such as
> radiant slabs, window AC, fan coils, etc. There is no HVAC system
> multiplier
> in EnergyPlus.
>
> Mike
>
>
> On 26 Jan 2005, at 11:11, Zhen Tian wrote:
>
> >
> > Hello, everyone:
> >
> > I have a question about using the "Zone List" & "Zone Group" objects.
> Right
> > now, I just simulate one typical floor for a multi-floor building. Since
> the fan
> > energy use is not linear to the air flow rate. I am considering using the
> zone
> > list and zone group to mimic this multiple floors.
> >
> > In my model, I set up zone list and then Zone Group and set "zone list
> > multiplier" as 6. Then I increase the system air flow rate, chilled water
> flow,
> > hot water flow and other system parametrics also 6 times to match the
> reauired
> > air flow and so on.
> >
> > Do I need to multiply zone equipments capacity? For example, if I have
> radiant
> > cooling slab system and baseoard, do i need to multiply this capacity of
> > equipment? And do I also need to multiply the "zone air flow rate" and
> > associated capacity of reheat coils?
> >
> > Thanks for your help.
> >
> > Regards,
> >
> > Zhen
> >
> >
> > ---------------------------------
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> >
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> >
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> >
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>
>
> ========================================================
> Michael J. Witte, GARD Analytics, Inc.
> EnergyPlus Testing and Support
> EnergyPlus-Support@xxxxxxxx
>
>
>
>
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> The primary EnergyPlus web site is found at:
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>
> The group web site is:
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>
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support
EnergyPlus-Support@xxxxxxxx
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