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Re: [EnergyPlus_Support] Re: question about outside air system plus unit ventilator
Chaoqin;
The induction unit is as close as you are going to get; The zone
equipment (unit ventilators etc)
can't be attached to a central air system. What can be attach are
"terminal units", and none of
those are configured as you describe. Not sure where in your system you
are dhumidifying. If you
are not dehumidifying at the zone it may be that the induction unit is
close enough thermodynamically to'
what you are trying to model. Especially since you would have to model
fan energy some other way.
Fred Buhl
zhaicq98 wrote:
>Mike,
>
>I am trying to set up the air loop for this system, in the way you
>suggested. However, as I read from the E+ reference, the induction
>unit in E+ does not work as I expected. The centrally conditioned air
>does not go through the heating and cooling coil in the space, only
>the induced space air does. In the system I am trying to simulate,
>the mixed air go through the heating and cooling coil. I am wondering
>if you can give me any further suggestion.
>
>Thanks,
>Chaoqin
>
>
>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
><mjwitte@g...> wrote:
>
>
>>(Sorry this was not answered sooner.)
>>
>>There is not a way to connect pretreated air to the unit
>>
>>
>ventilator, because
>
>
>>the unit ventilator forces outside conditions on the outside air
>>
>>
>node. The
>
>
>>system you describe is similar to the SINGLE DUCT:CONST VOLUME:4
>>
>>
>PIPE INDUC
>
>
>>system, except SINGLE DUCT:CONST VOLUME:4 PIPE INDUC does not allow
>>
>>
>for a zone
>
>
>>fan. SINGLE DUCT:SERIES PIU:REHEAT has a zone fan, but it only has
>>
>>
>reheat, no
>
>
>>zone cooling coil. If I am understanding the system correctly, I
>>
>>
>would suggest
>
>
>>using SINGLE DUCT:CONST VOLUME:4 PIPE INDUC and adding the zone fan
>>
>>
>power
>
>
>>either as additional fan power on the central unit or as an
>>
>>
>ELECTRIC EQUIPMENT
>
>
>>object in each zone.
>>
>>Mike
>>
>>
>>On 8 Jul 2005, at 20:46, zhaicq98 wrote:
>>
>>
>>
>>>Hi,
>>>
>>>I am working on a system which was designed for lab space. There
>>>
>>>
>are
>
>
>>>a heating coil, cooling coil, and supply fan and exhaust fan in
>>>
>>>
>the
>
>
>>>main air handling unit (AHU). In each lab space, there is a unit
>>>ventilator, which includes a cooling coil, heating coil and a
>>>
>>>
>fan.
>
>
>>>The pre-treated outside air from the main AHU is delivered to
>>>
>>>
>each
>
>
>>>lab space, where it gets mixed with the re-circulated air in that
>>>lab. The mixed air is then drawn through the unit ventilator,
>>>
>>>
>where
>
>
>>>it gets further cooled/heated. The exhaust air is drawn through
>>>
>>>
>the
>
>
>>>lab hood to the main AHU, where it is exhausted.
>>>
>>>I encountered some problems when I tried to simulate this system
>>>
>>>
>in
>
>
>>>E+. It seems to me that the unit ventilator in E+ will do the
>>>
>>>
>job.
>
>
>>>But I do not know how to connect the pre-treated outside air to
>>>
>>>
>the
>
>
>>>unit ventilator and how to get the air exhausted from the lab
>>>
>>>
>hood.
>
>
>>>Your help is really appreciated.
>>>
>>>Thanks,
>>>Chaoqin
>>>
>>>
>>>
>>>
>>>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.
>>>
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>>========================================================
>>Michael J. Witte, GARD Analytics, Inc.
>>EnergyPlus Testing and Support
>>EnergyPlus-Support@g...
>>
>>
>
>
>
>
>
>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.
>
>Yahoo! Groups Links
>
>
>
>
>
>
>
>
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