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Re: [EnergyPlus_Support] Re: Autosizing full FA with heat recovery
Elmer - what I was trying to say was that the autosizing calculations don't
take into account the presence of a heat recovery unit. You would get
the same
results (for flow rates etc) with or without the heat recovery unit.
Fred
Elmer Morrissey wrote:
>Hi Fred,
>
>Thank you for your response.
>
>Is it possible to to force 100% fresh air through the system when
>autosizing a heat recovery unit for the fresh air? (you probably
>implied that in your answer, I'm sorry if I didn't pick up on it).
>
>Kind regards
>
>-Elmer
>
>
>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, fred buhl <wfbuhl@...>
>wrote:
>
>
>>Elmer - it is my impression that one can size an air system (and
>>
>>
>subsequent
>
>
>>plant) for 100% outside air by choosing "Cooling 100% Outside
>>
>>
>Air" to
>
>
>>be yes
>>in System Sizing (and maybe also "Healing 100% Outside Air" yes).
>>
>>
>Can one
>
>
>>have the autosizing take into account heat recovery? No. That is
>>
>>
>on the
>
>
>>to do list.
>>
>>Fred Buhl
>>
>>Elmer Morrissey wrote:
>>
>>
>>
>>>Hi Mike,
>>>
>>>Thank you for the response. I am trying to autosize the OA air
>>>flowrate but I want full FA (I can't recirc the air due to
>>>pollutants). As a result, I want to size the full system, so I
>>>
>>>
>want
>
>
>>>to autosize the full plant so that it can deal will tempering
>>>
>>>
>100%
>
>
>>>FA conditions. So I guess, I am trying to autosize everything on
>>>
>>>
>the
>
>
>>>air and water loop. Should this pose problems?
>>>
>>>
>>>
>>>From what you are saying, if you are trying to autosize
>>
>>
>absolutely
>
>
>>>everything , you can't force full FA through the air loop (when
>>>
>>>
>you
>
>
>>>have a heat recovery unit). Am I right in saying this?
>>>
>>>Kind regards
>>>
>>>-Elmer
>>>
>>>
>>>
>>>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte"
>>><mjwitte@> wrote:
>>>
>>>
>>>
>>>
>>>>Sorry about the slow response. I do not understand the
>>>>
>>>>
>question.
>
>
>>>>
>>>>
>>>>
>>>>
>>>What are you
>>>
>>>
>>>
>>>
>>>>trying to autoszie - the coils or the OA flow rate? It may not
>>>>
>>>>
>be
>
>
>>>>
>>>>
>>>>
>>>>
>>>possible to
>>>
>>>
>>>
>>>
>>>>do this with autosizing. You may have to get preliminary sizes
>>>>
>>>>
>>>>
>>>>
>>>and force some
>>>
>>>
>>>
>>>
>>>>flow rates or capacities once you know the main system flow
>>>>
>>>>
>rate.
>
>
>>>>
>>>>
>>>>
>>>>
>>>Perhaps with
>>>
>>>
>>>
>>>
>>>>more details or an input file, we can determine how to help.
>>>>
>>>>Mike
>>>>
>>>>
>>>>On 8 May 2006 at 23:22, Elmer Morrissey wrote:
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>Hello all,
>>>>>
>>>>>How can you autosize full fresh air when you have a heat
>>>>>
>>>>>
>recovery
>
>
>>>>>system in an AHU.
>>>>>
>>>>>The system is a Heat recovery -> Mixer -> fan -> heating coil -
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>zone
>>>
>>>
>>>
>>>
>>>>>-> return
>>>>>
>>>>>In the past, I used an enconmizer to dummy up full FA control
>>>>>throughout the year. However, I have to set the controller to
>>>>>
>>>>>
>>>>>
>>>>>
>>>BYPASS
>>>
>>>
>>>
>>>
>>>>>in the Controller: OUTISIDE AIR which makes the old way
>>>>>
>>>>>
>>>>>
>>>>>
>>>impossible to
>>>
>>>
>>>
>>>
>>>>>implement.
>>>>>
>>>>>Can anyone point me in the right direction?
>>>>>
>>>>>Kind regards
>>>>>
>>>>>-Elmer
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>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.idf
>>>>>
>>>>>
>>>>>
>>>>>
>>>and press the
>>>
>>>
>>>
>>>
>>>>>"search" button.
>>>>>
>>>>>Yahoo! Groups Links
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>========================================================
>>>>Michael J. Witte, GARD Analytics, Inc.
>>>>EnergyPlus Testing and Support
>>>>EnergyPlus-Support@
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>>
>>>
>>>The primary EnergyPlus web site is found at:
>>>http://www.energyplus.gov
>>>
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>>>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.idf
>>>
>>>
>and press the "search" button.
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>>>
>>>
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>>
>>
>>
>
>
>
>
>
>
>
>
>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.
>
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