[Equest-users] Air Flows

[Karen Walkerman]

The increased airflow is probably due to a system sizing ratio greater than
1.0

--
Karen

On Tue, May 17, 2011 at 8:18 AM, Rob Hudson <rdh4176 at gmail.com> wrote:

> Because the unit is discharging the relief air and not individual room
> exhaust fans, you should leave all exhaust fans out of the picture.  Make
> sure you set the unit to be minimum of 1.00 ratio of outdoor air as well, to
> ensure that the unit is 100% OA.
>
> I would also check your elevation coefficient, this could be the cause of
> the increased supply air numbers you are seeing (but for the rather large
> increase you are seeing, something else may be causing issues as well).  I
> typically see values less than 10% for elevation values (at 1.10, would make
> your 7,500 cfm unit become 8,250 cfm).
>
> I'm sure others will have good ideas as well.
>
> -Rob
>
> On Tue, May 17, 2011 at 7:59 AM, Brad Robinson <brad.robinson at yahoo.com>wrote:
>
>> Sorry for all of the questions recently on this list, but this is the
>> first serious modelling attempt I am trying with eQuest.
>>
>> I have a constant volume, 100% OA unit serving patient rooms and
>> corridors  in a long term care facility.  I have set the airflow for the
>> unit at 7,500 cfm.  When I look at the SV-A report, the airflow is showing
>> at 9,090 cfm.  I then tried going into each individual sub-zone and setting
>> the airflows.  The sub-zones airflows in the SV-A report are higher than
>> what I have entered, and the total airflow still remains at 9,090. I am
>> thinking perhaps I have picked the wrong system.  I assumed I could use a
>> packaged single zone for this case.  Perhaps I should be using a different
>> system type?
>>
>> The other part of the question is how do I model the fact that is 100%
>> OA?  Th only reasonable solution I have found is to have the exhaust air in
>> each zone track the supply flow.  It is also asking for either static
>> pressure and efficiency, or kw/cfm.  As the exhaust is at the unit itself
>> via heat recovery using a heat pipe, I am not sure what I should be entering
>> here, as the fan details would be entered at the unit itself.  Thanks in
>> advance for any help.
>>
>> Brad Robinson
>>
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>
>
> --
> Rob Hudson
>
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