[Equest-users] DCV-RETURN-SENSOR, Hourly zone OA CFM for SCV Calculation

[Colin Milner]

Good Morning,
I'm modeling a building that uses fan coil units supplied via a central
boiler plant with out cooling any involved. I'm not sure how to model the
fan coils as terminal units in equest (what the correct input would be).
Thanks,
Colin

On Tue, Mar 13, 2012 at 5:21 PM, Molly Curtz <molly.curtz at arup.com> wrote:

> Hi All, ****
>
> I’m modeling a system with DCV set to “DCV-RETURN-SENSOR.” The help file
> says: “The program calculates the OA minimum requirement and sets the
> minimum damper position hourly based upon the sum of the ZONE requirements.
> Each zone OA requirement is calculated based upon the hourly maximum of
> either OA-CFM/PER (times the NUMBER-OF-PEOPLE adjusted by the hourly
> PEOPLE-SCHEDULE) or a minimum OA ventilation rate.” ****
>
> ** **
>
> However, when I look at the hourly report for the zone, “Hourly zone OA
> CFM requirement for DCV calculation (cfm)” (Var 100), the CFM does not
> increase for high occupancy hours. My hand calculations show that when I
> multiply the OA-CFM/PER by the hourly occupancy, it should exceed the
> minimum OA ventilation rate for the zone (which I specified using
>  OA-FLOW/AREA.)****
>
> ** **
>
> I have set the zone minimum flow ratios to “DCV-RESET-UP/DOWN” and the
> zone minimum flow is increasing according to the occupancy. ****
>
> ** **
>
> Why is the zone OA CFM requirement not increasing with occupancy? Any
> thoughts are appreciated.****
>
> ** **
>
> Thanks very much.****
>
> ** **
>
> Kind regards,****
>
> Molly****
>
> ** **
>
> ** **
>
> ** **
>
> *Molly Curtz***
>
> Mechanical Engineer****
>
> ** **
>
> *Arup*
>
> 403 Columbia Street  Suite 220 Seattle WA 98104****
>
> *t* +1 206 749 9674  *d* +1 206 493 2234  ****
>
> *f* +1 206 749 0665   **
>
> www.arup.com****
>
> ** **
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-- 
Colin Milner
colinemilner at gmail.com
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