[Equest-users] design flow input vs. SV-A supply flow reporting

[Pasha Korber-Gonzalez]

I referenced this information from the DOE2 dictionary volume 2.  Maybe it
will be helpful.

Pasha


*Zone Air flow key words: (from Vol2, pg 454)*
*

ASSIGNED-FLOW
*

Design supply air flow rate for the zone. Use either ASSIGNED-FLOW or
FLOW/AREA or AIRCHANGES/

HR. Note that FLOW/AREA or AIR-CHANGES/HR establish the minimum allowed
design air

flow; the actual design flow may be larger.
*

FLOW/AREA
*

The minimum design supply air flow rate to the zone per unit floor area. Use
either ASSIGNED-FLOW or

FLOW/AREA or AIR-CHANGES/HR Note that FLOW/AREA or AIR-CHANGES/HR establish
the

minimum allowed design air flow; the actual design flow may be larger.
*

AIR-CHANGES/HR
*

The minimum design supply air flow rate to the zone expressed as the number
of times per hour that the flow rate

replaces the total volume of air in the zone. Use either ASSIGNED-FLOW or
FLOW/AREA or AIRCHANGES/

HR Note that FLOW/AREA or AIR-CHANGES/HR establish the minimum allowed
design air

flow; the actual design flow may be larger.

*Zone Air flow precedence: (from Vol2, pg 454)* *

Airflow
*

The following keywords provide information on the flow of air into and out
of each zone (supply air, exhaust air,

and outside air).

Generally, all air quantities should be input at sea level because the
program makes a correction for altitude. If you

want to input air flow rates that have already been corrected for altitude
you should set SITEPARAMETERS:

ALTITUDE = 0 in LOADS.

There are four different methods of specifying a zone's supply air flow
rate:

 Specify ASSIGNED-FLOW,

 Specify AIR-CHANGES/HR; the flow is the larger of the default or this
value,

 Specify FLOW/AREA; the flow is the larger of the default or this value,

 Allow the program to calculate the air flow rate based on peak
heating/cooling load and difference

between design supply air temperature and zone temperature. This calculation
occurs when

ASSIGNED-FLOW is not entered. If either AIR-CHANGES/HR or FLOW/AREA is
specified, the

design flow is the larger of the default or the specified flow.



*Outside Air flow precendence:  (from Vol 2, pg 458)* *

Outside-Air Ventilation
*

The following keywords describe the outside air ventilation requirements of
a zone. If specified, these keywords take

precedence over specifying outside air at the SYSTEM level.


*Exhaust flow precendence:   (from Vol 2, pg 459) **

Exhaust Airflow and Fans
*

This set of keywords defines exhaust at the zonal level. If zonal exhaust
requires more outside air that specified for

ventilation, exhaust will take precedence.





On Fri, Oct 8, 2010 at 9:06 AM, Paul Diglio <paul.diglio at sbcglobal.net>wrote:

>  Carol:
>
> I am having the same problem with airflow almost double from what I
> specified.  I tried the altitude correction and that did not help.
>
> Does the zone air flow and exhaust rate take preference over the fan flow
> parameters?
>
> Thank you,
>
> Paul Diglio
>
>
>  ------------------------------
> *From:* Carol Gardner <cmg750 at gmail.com>
> *To:* cstalberg at naturalintelligence.us
> *Cc:* equest-users at lists.onebuilding.org
> *Sent:* Fri, October 8, 2010 9:33:46 AM
> *Subject:* Re: [Equest-users] design flow input vs. SV-A supply flow
> reporting
>
> Not stupid at all, If you have your altitude set to anything but 0 eQUEST
> will adjust your cfm accordingly. I always go in and set it manually to
> zero. I think it reads what it is off the weather file.
>
> Carol
>
> On Fri, Oct 8, 2010 at 6:54 AM, Christian Stalberg <
> cstalberg at naturalintelligence.us> wrote:
>
>>  They say no question is a stupid question.
>>
>> Why is my zone level supply flow cfm reported value in the SV-A report
>> higher than my overall design flow (ASSIGNED-FLOW) value? The
>> system sizing ratio is set at 1.00 (default).
>>
>> Thanks in advance.
>>
>> _______________________________________________
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>>
>
>
> --
> Carol Gardner PE
>
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