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Re: [EnergyPlus_Support] Re: Confusion over Fan in AirFlow Network

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: Confusion over Fan in AirFlow Network
From: Lixing Gu <gu@xxxxxxxxxxxx>
Date: Fri, 28 Dec 2007 09:43:26 -0500
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Ooi:

If you know airflow rate and/or as a function of temperature and wind speed, 
you may use infiltration objects. If you want to look at airflows between 
room and attic also, you may use MIXING or CROSS MIXING objects.

If you don't know what airflow rates are, you may use the AirflowNetwork 
model. You need to specify a relationship between airflow and pressure for 
each opening. The avilable opening components are described in the 
InputOutput Refrence, such as AIRFLOWNETWORK:MULTIZONE:SURFACE CRACK DATA, 
and AIRFLOWNETWORK:MULTIZONE:COMPONENT DETAILED OPENING. There are several 
example input files using the AirflowNetwork model.

Hope the above general guidelines help.

Lixing


----- Original Message ----- 
From: "ooikoonbeng2004" <ooi_kb3@xxxxxxxxxxx>
To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Wednesday, December 26, 2007 12:25 AM
Subject: [EnergyPlus_Support] Re: Confusion over Fan in AirFlow Network


> Merry Christmas to everyone,
>
> i am starting AirFlow network and have decided to take one step back
> by neglecting any fan in my modelling of two classrooms with a
> common space above the ceilings under the roof. As suggested by
> Michael Witte about half a year ago, i should model this space as a
> zone, the attic, so i have a 3 zone building.
>
> Can someone advise me which of the AirFlow Network and/or
> Infiltration objects to use if i just want to see the effect of the
> air in the attic on the room and surface temperatures.
>
> Around midday, as the corrugated metal roof heats up the air in the
> attic, the air would flow out through the openings between the
> corrugated roof and its horizontal supports at the eaves. There is
> also a small gap underneath the door to each room.
>
> Many thanks and Happy new 2008 to one and all.
> ooi
> <gu@...> wrote:
>>
>> Ooi:
>>
>> I don't have suggestiongs how much attic infiltration is. You may
> try to
>> find values in other publications.
>>
>> The AirflowNetwork model requires an air primary loop. Any coils
> and fan
>> have to be a part of the loop. The allowed coil types are listed
> in the
>> Energy+.idd and Input Output Reference. An example input file of
>> AirflowNetwork_Multizone_House.idf uses
> UNITARYSYSTEM:HEATPUMP:AIRTOAIR. The
>> unitary system uses allowed coil types. The answer to your
> question is that
>> if a compact unitary system uses allowed coil types, it should
> work.
>>
>> Hope my answers help.
>>
>> Best regards,
>>
>> Lixing
>> ----- Original Message ----- 
>> From: "ooikoonbeng2004" <ooi_kb3@...>
>> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
>> Sent: Wednesday, July 04, 2007 12:36 AM
>> Subject: [EnergyPlus_Support] Re: Confusion over Fan in AirFlow
> Network
>>
>>
>> > Lixing,
>> >
>> > Many thanks for how to disable the AirFlow Network.
>> >
>> > i shall try Infiltration first. Any adice on the variables to use
>> > for this object if the infiltration to the attic, space between
> the
>> > horizontal overhang ceilings and the sloping roof, is only
> through
>> > the corrugations in the roofing metal sheets as they are nailed
> to a
>> > horizontal wood?
>> >
>> > Meanwhile, is Compact HVAC:System:Unitary supported if i use the
>> > choice as MULTIZONE WITH DISTRIBUTION or MULTIZONE WITH
> DISTRIBUTION
>> > ONLY DURING FAN OPERATION in the AirflowNetwork Control field in
> the
>> > AirflowNetwork Simulation object?
>> >
>> > regards,
>> > ooi
>> > Meanwhile can you let me know if --- In
>> > EnergyPlus_Support@xxxxxxxxxxxxxxx, Lixing Gu <gu@> wrote:
>> >>
>> >> Ooi:
>> >>
>> >> It seems the input file does not specify a fan as
> Zone2WindACFan,
>> > so that
>> >> the first error message occurs (GetFanIndex: Fan not
>> > found=Zone2WindACFan).
>> >> In other words, Zone2WindACFan is not listed in fan index. You
> may
>> > define
>> >> the fan in the AIRFLOWNETWORK:DISTRIBUTION:COMPONENT CONSTANT
>> > VOLUME FAN
>> >> object. Since the fan is not listed in the fan index, the prgram
>> > can not go
>> >> any further.
>> >>
>> >> My suggestion is to disable the AirflowNetwork model first to
> see
>> > whether
>> >> you can eliminate the first error or not. The model disablement
> is
>> > to use
>> >> the choice of NO MULTIZONE OR DISTRIBUTION in the AirflowNetwork
>> > Control
>> >> field in the AirflowNetwork Simulation object. If you still have
>> > problems,
>> >> please upload the file. I will take a look.
>> >>
>> >> By the way, Window AC is not supported for the time being if you
>> > use the
>> >> choice as MULTIZONE WITH DISTRIBUTION or MULTIZONE WITH
>> > DISTRIBUTION ONLY
>> >> DURING FAN OPERATION in the AirflowNetwork Control field in the
>> >> AirflowNetwork Simulation object
>> >>
>> >> Thanks.
>> >>
>> >> Lixing Gu
>> >>
>> >> ----- Original Message ----- 
>> >> From: "ooikoonbeng2004" <ooi_kb3@>
>> >> To: <EnergyPlus_Support@xxxxxxxxxxxxxxx>
>> >> Sent: Monday, July 02, 2007 2:06 AM
>> >> Subject: [EnergyPlus_Support] Confusion over Fan in AirFlow
> Network
>> >>
>> >>
>> >> > Confusion over Fan
>> >> >
>> >> >
>> >> > Hello everyone,
>> >> >
>> >> > i am starting to use the AirFlow Network with only the
>> >> > MultiZone:Surfaces referring to the SIMPLE house example.
>> >> >
>> >> > From the .err file, a zone needs two surfaces and i have
> added a
>> >> > door to each zone. So, correct me if i am wrong, the air in
> the
>> >> > AirFlow Network goes through ceiling crack/leakage and door
>> > leakage.
>> >> >
>> >> > As i am only studying the thermal aspects of the building
>> > envelop, i
>> >> > do not use a Direct air or fan as in the Simple House example.
>> > But i
>> >> > have a Window AirConditioner in the second zone.
>> >> >
>> >> > The messages in .err file, includes:
>> >> >
>> >> > GetFanIndex: Fan not found=Zone2WindACFan
>> >> > GetAirflowNetworkINput: The fan type defined in
>> >> > AIRFLOWNETWORK:DISTRIBUTION:COMPONENT CONSTANT VOLUME FAN =
>> >> > ZONE2WINDACFAN is not allowed etc.
>> >> >
>> >> > The 'Fan' in the error message can only refer to the fan in
>> > Window
>> >> > AC. But how do i enter the index of this fan or overcome the
>> > errors
>> >> > in the .err file?
>> >> >
>> >> > kind regards,
>> >> > ooi
>> >> >
>> >> >
>> >> >
>> >> >
>> >> > The primary EnergyPlus web site is found at:
>> >> > http://www.energyplus.gov
>> >> >
>> >> > The group web site is:
>> >> > http://groups.yahoo.com/group/EnergyPlus_Support/
>> >> >
>> >> > Attachments are not allowed -- please post any files to the
>> > appropriate
>> >> > folder in the Files area of the Support Web Site.
>> >> >
>> >> > EnergyPlus Documentation is searchable.  Open
> EPlusMainMenu.pdf
>> > under the
>> >> > Documentation link and press the "search" button.
>> >> >
>> >> > Yahoo! Groups Links
>> >> >
>> >> >
>> >> >
>> >> >
>> >>
>> >
>> >
>> >
>> >
>> > The primary EnergyPlus web site is found at:
>> > http://www.energyplus.gov
>> >
>> > The group web site is:
>> > http://groups.yahoo.com/group/EnergyPlus_Support/
>> >
>> > Attachments are not allowed -- please post any files to the
> appropriate
>> > folder in the Files area of the Support Web Site.
>> >
>> > EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf
> under the
>> > Documentation link and press the "search" button.
>> >
>> > Yahoo! Groups Links
>> >
>> >
>> >
>> >
>>
>
>
>
>
> The primary EnergyPlus web site is found at:
> http://www.energyplus.gov
>
> The group web site is:
> http://groups.yahoo.com/group/EnergyPlus_Support/
>
> Attachments are not allowed -- please post any files to the appropriate 
> folder in the Files area of the Support Web Site.
>
> EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the 
> Documentation link and press the "search" button.
>
> Yahoo! Groups Links
>
>
>
> 



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References:
- [EnergyPlus_Support] Re: Confusion over Fan in AirFlow Network
  - From: ooikoonbeng2004

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