[Equest-users] Hours outside of throttling range -VAV system

Steve Mignogna smignogna at gmail.com
Wed Jan 21 14:14:10 PST 2009


Turning "cycle on any" on will allow the system to cycle on at night or
whenever the fan schedule is set to "0".  This will usually get rid of the
hours that are out of range when the system starts up.

On Tue, Jan 20, 2009 at 3:47 PM, James Geers <jgeers at sfa-architects.com>wrote:

>
>
> Using "Cycle on Any" does the trick.  Thank you.  Will this affect my DCV?
>
>
>
> James F. Geers
>
> *Registered Architect***
>
> *LEED Accredited Professional*
>
> * *
>
> *SFA Architects***
>
> *300 West Fourth Street***
>
> *Cincinnati**, Ohio 45202***
>
> *513.721.0600**    *
>
> *513.721.0611 (fax)***
>
>
>  ------------------------------
>
> *From:* Howe, Timothy [mailto:Timothy.Howe at stantec.com]
> *Sent:* Tuesday, January 20, 2009 3:28 PM
> *To:* James Geers; equest-users at lists.onebuilding.org
> *Subject:* RE: [Equest-users] Hours outside of throttling range -VAV
> system
>
>
>
> Go to: Air-side HVAC System Parameters -> Fans -> Night Cycle Control ->
> Select: Cycle on any.
>
>
>
>
>
> *Timothy Howe, MS, LEED(R) AP*
> Mechanical Engineer
>  ------------------------------
>
> *From:* equest-users-bounces at lists.onebuilding.org [mailto:
> equest-users-bounces at lists.onebuilding.org] *On Behalf Of *James Geers
> *Sent:* Tuesday, January 20, 2009 3:13 PM
> *To:* equest-users at lists.onebuilding.org
> *Subject:* [Equest-users] Hours outside of throttling range -VAV system
>
> I likewise have been having enormous trouble reducing the hours outside of
> the throttling range for my design case building.   In the winter months in
> the morning I will have multiple hours outside of the throttling range for
> multiple zones and this exceeds 300  hours.
>
>
>
> Things I have varied but did not solve the problem include:
>
>
>
>    1. Occupancy schedule
>    2. Heating Design Day Schedule
>    3. Night Setback Temperature
>    4. Boiler Size
>    5. Loop Capacity
>    6. Pump Size
>    7. Delta T for heating and Pre-heating coils
>    8. Minimum Outside Air
>    9. Throttling Range
>    10. Design temperature
>
>
>
>
>
> At this point I am randomly changing settings to reduce the amount of hours
> outside of throttle range, but I would like to have a more deductive
> process.
>
>
>
> I have a suspicion that there was a setting in the wizard that is
> overriding my inputs, but that is conjecture.
>
>
>
> My engineer designed the system in Trane Trace and oversized it by 25% so
> the designed heating equipment should be adequate.
>
>
>
> Thank you,
>
>
>
> James F. Geers
>
> *Registered Architect***
>
> *LEED Accredited Professional*
>
> * *
>
> *SFA Architects***
>
> *300 West Fourth Street***
>
> *Cincinnati**, Ohio 45202***
>
> *513.721.0600**    ***
>
> *513.721.0611 (fax)***
>
>
>
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>


-- 
Steve Mignogna
Atelier Ten
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