[Equest-users] DCV keywords with OA-FROM-SYSTEM?

[B. Fountain]

I can tell you that heat recovery using the OA-FROM-SYSTEM as a central
MAU does still have an issue in version 3.63.  The exhaust air stream for
the heat recovery unit is only from the zones directly served by the
OA-FROM-SYSTEM system, not the other systems which draw air from this
system.  So, if you are creating a dummy zone for this system, the exhaust
is just from the dummy zone and will be cold (up here in Can)not showing
the true heat recovery.



> Hi,
> Does anybody know whether the several issues associated with the use of
> OA-FROM-SYSTEM via dummy zones to model DOAS in eQuest have really been
> addressed in V 3.63?
> In the documentation that comes with V 3.63 I didn't find any definitive
> answer, and I see some users keep on having problems with it. It would
> be nice to know by sure which are the limitations that still persist to
> avoid having to check models in detail to guess what the program is
> doing. Could any of the developers give some light on this subject?
> Regards,
>
> En/na Joshua Wolfe ha escrit:
>> Brian,
>>
>> Good luck, I have tried to get the OA from other system command to work
>> with no success. With that being said I have not tried in v3.63 just
>> v3.61e, the problem may have been fixed. Instead of using
>> OA-from-other-system I usually model a dedicated OA system with an
>> IU-fan coil setup.
>>
>> -Josh
>> -----Original Message-----
>> From: equest-users-bounces at lists.onebuilding.org
>> [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of B.
>> Fountain
>> Sent: Tuesday, June 16, 2009 7:20 AM
>> To: equest-users at lists.onebuilding.org
>> Subject: [Equest-users] DCV keywords with OA-FROM-SYSTEM?
>>
>> Has anyone had success using the demand ventilation control keywords
>> with
>> a central make-up air system using the OA-FROM-SYSTEM keywords?
>>
>> In the test runs we've done, the OA volume in the "from" system does not
>> seem to back down with occupancy.
>>
>> Thanks!
>>
>> Brian
>>
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> *Xavier García Casals*
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